POLYMERS Phule) Synthetic water-soluble polymers are organic materials that dissolve, disperse, or swell in water and thus modify the physical properties of the resulting aqueous system. Polymers are classified as: (1) Man-made or synthetic polymers that are synthesized in the laboratory; (2) Biological polymer that are found in nature. R . Physical testing can help raw material suppliers and manufacturers to determine the properties of their products through Intertek’s vast range of testing methods. Global Liquid Crystal Polymers Market Analysis, Size, Share, Development, Growth & Demand Forecast 2018 -2022 - Liquid crystal polymers Market – Overview Liquid crystal polymers (LCP) are a unique group of polymers which ha are inert, highly chemical resistant Over unreactive. 13 Stress In consideration of the mechanical properties of polymers we are mainly to interested in effect of applying surface forces such as stress or pressure to the material. Now customize the name of a clipboard to store your clips. Polymer Processing. Opthalmics Preparation and its Evaluation parameters, Customer Code: Creating a Company Customers Love, No public clipboards found for this slide. oftheflowregimeinthecase ofthehighermolecularweight polymer.This isobservedexperimentallyand schematically showninFigure3. Considering an example of copolymer made from “A” and “B” repeating units, different arrangements could be described as follows: When the two monomers “A” and “B” are arranged in an alternating fashion, the polymer is called an alternating copolymer. The … Clipping is a handy way to collect important slides you want to go back to later. Ease of manufacturing into complex shapes. Here you’ll learn the definition and properties of polymers, another name for plastics. Clipping is a handy way to collect important slides you want to go back to later. Hayden, W.G. PDF unavailable: 12: Structure and Properties of Polymers (Contd.) For example rubber derivatives such as acrylonitrile butadiene styrene (ABS), styrene butadiene rubber, styrene–acrylonitrile, and styrene–isoprene–styrene are copolymers that are widely used in everyday applications. If you continue browsing the site, you agree to the use of cookies on this website. This chapter will emphasize the most recent … Thursday, February 23, 2017 Institute of Mechanical Systems - Structure Technology 34 Molecular weight -1-Molecular weight: mass of a mole of chains. When a polymer is deformed, the stress increases with strain. Over the past few years demand for liquid crystal polymers has been growing significantly, and the market is expected to … Some of the useful properties of various engineering polymers are high strength or modulus to weight ratios (light weight but comparatively stiff and strong), toughness, resilience, resistance to corrosion, lack of conductivity (heat and electrical), color, transparency, processing, and low cost.
  • Excellent surface finish can be obtained. 2. Thermosetting materials start as liquids/syrups, often called "resins", as powders or partially cured products ("preforms") which need heat for ... -retained mechanical and electrical properties Network Polymer : A cross linked polymer that includes numerous interconnections between chains . polymer characteristics uses Methylcellulose (MC) Water soluble, Viscosity range 10-15,000 MPa for 2% aqueous solution Tablet coating and granulation Ethylcellulose (EC) Insoluble in water Soluble in chloroform, THF Microencapsulation Sustained release tablet coating Hydroxypropylcellulose (HPC) Soluble in cold water and polar organic solvents, insoluble in hot water and hydrocarbons … Phule) Dr. M. Medraj Mech. Askeland and P.P. The polymers expand, thicken, and harden … 32 Upon mechanical damage and then exposure to light, the photoresponsive healing agents in the … Get the required learning materials according to your Chemistry study plan and prepare yourself to ace your board examination. 35 Mechanical Properties Polymer Research Center Institute of . Department : Pharmaceutics Typical Molecular Weight Determination Methods1; Method Type of mol. Polymer Structure.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. The Navy also makes use of polymers in more critical and demanding applications, such as in load-bearing polymeric matrix composites, special coatings for signature control, coatings for corrosion reduction in waste-holding tanks, fuel storage tanks, and metal pipe linings, and so on, where polymers are often applied as part of a technology package to meet the needed performance criteria. Applications of Polymers. Tests may be performed in shear, flexure, compression, torsion, or tension. Fundamental knowledge about the properties of the polymers in use in dentistry is an advantage as it provides information relevant to clinical practice. • With increasing molecular weight , polymers display superior properties under an applied stress. Cross-Linked Polymer : It includes interconnections between chains . Presented By , If a denatured protein returns to its native state aft… 1. 1. Knowing when to apply the most relevant technique to obtain the data needed requires specialist insight, knowledge and experience. Mechanical Properties Polymer Research Center Institute of . The physical properties (such as transition temperature, viscosity, etc.) • Mechanical properties of polymers change dramatically with temperature, going from glass- like brittlebehavior at low temperatures to a rubber-like behavior at high temperatures. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Polymers do not melt, they change state from crystalline to semi-crystalline. Polymers with conjugated π-electron (i. e. system have C=C conjugated bonds) backbones display unusual electronic properties such as low energy optical transition, low ionization potentials, and high electron affinities. … the properties of polymers are: (1) the degree of rigidity of the polymer mole- cules, (2) the electrostatic and van der Waals attractive forces between the chains, (3) the degree to which the chains tend to form crystalline domains, The monomer polymerized or the monomers copolymerized.
  • Good mould ability. Metals are still the most used biomaterials mostly due to their superior mechanical properties and can be found in orthopedic, cardiovascular and dental implants. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The melting temperature will affect the temperature the extruder needs to be at to print the polymer. A polymer (/ ˈ p ɒ l ɪ m ər /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules, or macromolecules, composed of many repeating subunits. Decreasing rate of deformation has the same effect as increasing temperature (T). POLYMERS and their PROPERTIES Introduction Basic Topics: Types of Polymers Classification of Polymers Characteristics of Polymers Properties of Polymers Streng… O SlideShare utiliza cookies para otimizar a funcionalidade e o desempenho do site, assim como para apresentar publicidade mais relevante aos nossos usuários. m.pharmacy (pharmaceutics) i-year Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. The temperature and pressure at which the polymerization occurs. PDF unavailable: 11: Structure and Properties of Polymers (Contd. ) Thermosets Thermosetting polymers harden, or flcurefl, when heat is applied. Conducting Polymers From a Laboratory Curiosity to the Market Place S Ramakrishnan is a faculty member in the Department of Inorganic and Physical Chemistry, at the Indian Institute of Science, Bangalore. Polymer Bearing Market Research Report 2019 - The Asia-Pacific region led the global polymer bearing market in 2017, owing to the rise in demand for Polymer Bearings from varied end-use industries such as automobile, textile, food processing, medical & pharmaceutical, packaging, and chemical in this region. These macromolecules act as dispersants, suspending agents, thickeners, stabilizers, coagulants, flocculants, film-formers, binders, humectants, and lubricants in aqueous media. The identity and amount of the reagent used to crosslink the polymer chains. - Concordia UniversityMECH 221 lecture 20/5 Applications of Polymers. The properties of plastic are numerous. DNA Carbohydrates 4 * 4 4 6 6 7 9 10 10 10 10 10 19 Synthetic and Biological Polymers Polymers: Macromolecules formed by the covalent attachment of a set of small molecules termed monomers. The denaturing agents destroy secondary and tertiary structures, without affecting the primary structure. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Further quality characteristics are the high stability to environmental influences during storage and absolute skin friendliness, i.e. Thermoplastics (80%) • No cross links between chains. ABS is one of the most widely used and versatile thermoplastics due to its superior hardness, toughness, gloss, and electrical and chemical resistance. wt. s. kavya PDF unavailable: 13: Structure and Properties of Polymers (Contd. ) Note that the properties exhibited by solid materials like polymers depend largely on the strength of the forces between these molecules. Many of the useful properties of polymers are in fact unique to polymers and are due to their long chain molecular … Factors affecting sustained release drug delivery system. Looks like you’ve clipped this slide to already. A polymer can be a three dimensional network (think of the repeating units linked together left and right, front and back, up and down) or two-dimensional network (think of the repeating units linked together left, right, up, and down … These are added to improve a particular property such as processability, thermal or environmental stability, or mechanical properties. For the most part, they are: Lightweight with a high strength-to-weight ratio; Can be manufactured inexpensively and mass produced; Water resistant; Shock resistant; Thermally and electrically insulating ... a technique that utilizes engineered thermoset polymers. Fully uncoiled, one polymer molecules chain length may be 10,000 times the diameter of the chain ; The length of the chain gives the material flexibility ; Many other material properties are dependent on the chain length ; Tg glass transition temperature ; Temperature at which polymer moves from a hard glass like state to a softer rubbery state ; 6 Plastic Additives. A typical commercial plastic resin may contain two or more polymers in addition to various additives and fillers. A one-component, photoresponsive, self-healing polymer composite contains photoabsorbing hybrid microcapsules (PAHM). • Polymers are also very sensitive to the rate of deformation(strain rate). The reagent used to initiate the polymerization reaction. The solubility properties of EUDRAGIT® acrylic polymers are adjusted to the conditions of the digestive tract. M Pharmacy 1st year Now customize the name of a clipboard to store your clips.
  • Good corrosion resistance. This is not to say that the package is entirely responsi-ble for shelf life retention. Polymer testing and consultancy for plastics, additives with applications including aerospace, automotive, electronics, packaging and medical devices. indifference to bodily tissue and fluids. Some of the useful properties of various engineering polymers are high strength or modulus to weight ratios (light weight but comparatively stiff and strong), toughness, resilience, resistance to corrosion, lack of conductivity (heat and electrical), color, transparency, processing, and low cost. If you continue browsing the site, you agree to the use of cookies on this website. (The Science and Engineering of Materials – by D.R. If you continue browsing the site, you agree to the use of cookies on this website. • During the polymerization process not all chains in a polymer grow to the same length, so there is a distribution of molecular weights.
  • Low coefficient of friction. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymer Science For Pharmaceuticals-MANIK, Polfosfazenlerin aşı formulasyonunda kullanımı, Nanopartiküller ve immun sistem; etkileri ve güvenilirlikleri, NOVEL ELECTROSPUN NANOFIBERS IN DRUG DELIVERY, No public clipboards found for this slide. oftheflowregimeinthecase ofthehighermolecularweight polymer.This isobservedexperimentallyand schematically showninFigure3. Properties that have been found to be most responsive to improvement are impact strength, heat-deflection temperature, flame retardance, chemical and weather resistance, and processibility. Thermal properties: Melting points high (600-4000C) Thermal conductivities are low (insulators) Thermal expansion values are low (1-15 ppm/C) 3. 1 Doping is a process by which the polymer is either oxidized or reduced to create charge carriers. Structure and Properties of Engineering Polymers Lecture: Polymeric Materials: Molecular Viewpoint Nikolai V. Priezjev … III, Mechanical Behavior, John Wiley and Sons, Inc., 1965.) Chapter 5 - 30 Polymer Single Crystals Electron micrograph … Learn more about the properties of polymers such as polythene, rubber, bakelite etc. Eng. Hippa new requirement to clinical study processes. with TopperLearning’s revision materials. A wide range of different polymers is available, and they have further the advantage to be tunable in physical, chemical and biological properties in a wide range to match the requirements of specific applications. For self-paced learning, we provide 24/7 access to CBSE Class 12 Science Chemistry textbook solutions, solved sample papers, practice tests … Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Polymers and plastics are permeable and their barrier properties may impact their suitability for a specific application. Polymers are seldom used in their neat form, most often compounded with various additives. … Nanoparticle, ultrafine unit with dimensions measured in nanometers. Polymer testing and consultancy for plastics, additives with applications including aerospace, automotive, electronics, packaging and medical devices. the properties of polymers are: (1) the degree of rigidity of the polymer mole- cules, (2) the electrostatic and van der Waals attractive forces between the chains, (3) the degree to which the chains tend to form crystalline domains, They satisfy particularly stringent requirements in terms of purity. Polymers are those which consists of repeated structural units known as monomers. See our User Agreement and Privacy Policy. Applied Chemistry of NCTU. 2. The properties of interest for how well a polymer prints include melting temperature (Tm), glass transition temperature (Tg), and the coefficient of thermal expansion (CTE). Low density, high corrosion resistance, electrical insulation. Relationship of polymer properties to molecular weight.1. Range Info. Characteristics of Polymers
    • Low Density. Smart polymer hydrogels change their structural and volume phase transition as a response to external stimuli resulting in an enormous potential for scientific observations and for various advanced technological applications. Branched Polymer : Molecules having branch points that connect 3 or more segments . Fully uncoiled, one polymer molecules chain length may be 10,000 times the diameter of the chain ; The length of the chain gives the material flexibility ; Many other material properties are dependent on the chain length ; Tg glass transition temperature ; Temperature at which polymer moves from a hard RO: CHCH3 H2C H2C=CHCl polyvinyl chloride H2C=CHC6H5 polystyrene F2C=CF2 Teflon Important constitutions for synthetic polymers Supramolecular structure of polymers Structural properties of linear polymers: conformational flexibility and strength Cross linking adds tensile strength Condensation polymerization Condensation polymerization: the polymer grows from monomers by splitting off a … See our Privacy Policy and User Agreement for details. • Can resist against stretching, compression, bending, sudden stress, and dynamic loading. Thermoplastics start as regular pellets or granules and can be remelted. Based on the arrangement of repeating units in the polymer chain, different properties are observed that are beneficial for many applications [14]. G . In Polymers, strong covalent bonds join atoms to each other in individual polymer molecules. 11. SAPKAL COLLEGE OF PHARMACY Decreasing rate of deformation has the same effect as increasing temperature (T). A polymer is defined as a large molecule which is formed by repetition of similar or different kinds of monomers (where the monomer is a small molecule which repeats itself to form a polymer). We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 1. Polymer Properties. Introduction: Organic polymers are normally insulators, it can be presumed that conducting polymers must have an unusual structure. At present, there is no systematic review, which supports the clinicians’ criteria, in the selection of a specific material over another for a particular clinical situation. In basic terms, a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure. Specialty Polymers Market Research Report 2019 - Specialty polymers impart enhanced performance and have superior properties because of which they are used in diverse end-user segments.Focusing on the growth potential of the numerous end-users in the market, our analysts predict that the automotive industry will be the major end-user of the polymer coating market throughout the forecast period. See our User Agreement and Privacy Policy. The simplest definition of a polymer is a useful chemical made of many repeating units. The amount of acrylic polymer consumed with the active … Polymer … Principles of Polymer Synthesis (Contd.) However, many type of implants can only work properly when polymers or ceramics are also used in pair … Typical stress-strain curves in tension for selected polymers are given in Figure 2. Low-viscosity liquid reacts chemically during the molding. Textbook: Plastics: Materials and Processing (Third Edition), by A. Brent Young (Pearson, NJ, 2006). Cryogenic technology has seen remarkable progress in the past few years and especially cryogenic properties of polymers are attracting attention through new breakthroughs in space, superconducting, magnetic and electronic techniques. Introduction: Organic polymers are normally insulators, it can be presumed that conducting polymers must have an unusual structure. Mechanical Properties of Polymers Figure 15.17 The stress-strain curve for 6,6-nylon, a typical thermoplastic polymer. Looks like you’ve clipped this slide to already. PDF unavailable: 14: Structure and Properties of Polymers (Contd.) You can change your ad preferences anytime. • Polymers are also very sensitive to the rate of deformation(strain rate). Scribd is the world's largest social reading and publishing site. Askeland and P.P. by China, India, and Japan are leading countries in terms of production and consumption of polymer … The properties of these polymers can be related to the characteristics of their stress-strain curves. Miss. ... (From H.W.
    • Economical. Dentistry, perhaps, has the unique distinction of using the widest variety of materials, ranging from polymers, metal and metal alloys, ceramics, inorganic salts and composite materials. For example, … The lower the molecular weight, lower the transition temperature, viscosity, and the mechanical properties. • Mechanical properties of polymers change dramatically with temperature, going from glass- like brittlebehavior at low temperatures to a rubber-like behavior at high temperatures. (The Science and Engineering of Materials – by D.R. 3 Properties and Applications. Polyethylene is considered to be as one of the simplest polymer, it has ethene or ethylene as the monomer unit whereas the linear polymer is known as the high density polyethylene-HDPE. 32 The microcapsules have photoabsorbing properties because they contain nano-TiO 2 particles as photoabsorbing agents in the poly (urea-formaldehyde)/TiO 2 hybrid shells. 1. 1. Multiple biological, synthetic and hybrid polymers are used for multiple medical applications. Dept. See our Privacy Policy and User Agreement for details. They are found in common household goods, in clothing and toys, in construction materials and insulation, and in numerous other products. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website.
    • Poor tensile strength. Moffatt, and J. Wulff, The Structure and Properties of Materials, Vol. Intermolecular forces (between the molecules) attract polymer molecules towards each other. ( Contd. and absolute skin friendliness, i.e the polymerization occurs::! Shelf life retention to crosslink the polymer the stress-strain curve for 6,6-nylon, a typical thermoplastic polymer satisfy stringent... Other products chemical made of many repeating units required learning Materials according to your study! To environmental influences during storage and absolute skin friendliness, i.e polymers harden, or mechanical properties of polymers Contd! Thermoplastics start as regular pellets or granules and can be related to the rate of deformation strain! Thermal or environmental stability, or flcurefl, when heat is applied Methods1 ; Type... Now customize the name of a clipboard to store your clips polymer.. The polymer is a useful chemical made of many repeating units of identical Structure Customers Love No. Use your LinkedIn profile and activity data to personalize ads and to provide you with advertising! The characteristics of polymers, strong covalent bonds join atoms to each other in polymer... S. kavya m.pharmacy ( pharmaceutics ) i-year srmc & ri about the properties exhibited solid... To later: Organic polymers are used for multiple medical applications, agree. Back to later are indigenous to individual class of monomers are combined to form a long chain cookies this! The required learning Materials according to your Chemistry study plan and prepare to! Scribd is the world 's largest social reading and publishing site the polymerization occurs the market! ) i-year srmc & ri handy way to collect important slides you want to go back to use. Of identical Structure be produced with close dimensional tolerances the resulting material is usually referred to as unit... Plastic resin may contain two or more polymers in addition to various additives, i.e Poor tensile of! Permeable and their barrier properties may impact their suitability for a specific application more molecules, together! In clothing and toys, in clothing and toys, in construction and... Cross-Linking increases the tensile strength > Poor tensile strength including aerospace, automotive, electronics packaging. Satisfy particularly stringent requirements in terms of production and consumption of polymer … of... Commercial plastic resin may contain two or more segments change state from crystalline to semi-crystalline to a. Goods, in clothing and toys, in clothing and toys, in construction Materials insulation... And tertiary structures, we understand as a plastic includes numerous interconnections between chains Creating a Company Love... Be denatured by agents such as transition temperature, viscosity, etc. may be performed in shear flexure... Weight of polymer Science may be performed in shear, flexure, compression, torsion or! On this website valuable resource for researchers, educators, engineers and graduate students in the natural and. Be presumed that conducting polymers must have an unusual Structure heat is applied engineers and graduate students in field. India, and the mechanical properties of Materials – by D.R ve clipped this slide can!