properties of polymers slideshare

• Mechanical properties of polymers change dramatically with temperature, going from glass- like brittlebehavior at low temperatures to a rubber-like behavior at high temperatures. 13 … Hippa new requirement to clinical study processes. Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. The reagent used to initiate the polymerization reaction. Tests may be performed in shear, flexure, compression, torsion, or tension. Get the required learning materials according to your Chemistry study plan and prepare yourself to ace your board examination. As chain length and cross-linking increases the tensile strength of the polymer increases. Structure and Properties of Engineering Polymers Lecture: Polymeric Materials: Molecular Viewpoint Nikolai V. Priezjev Department : Pharmaceutics 1. If a denatured protein returns to its native state aft… Applied Chemistry of NCTU. • Polymers are also very sensitive to the rate of deformation(strain rate). Decreasing rate of deformation has the same effect as increasing temperature (T). As a ‘bridge’ polymer whose properties lie between commodity plastics and high performance engineering thermoplastics, ABS has become the largest selling engineering thermoplastic. Knowing when to apply the most relevant technique to obtain the data needed requires specialist insight, knowledge and experience. 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 … 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. These are added to improve a particular property such as processability, thermal or environmental stability, or mechanical properties. Properties of Polymers . Polymer testing and consultancy for plastics, additives with applications including aerospace, automotive, electronics, packaging and medical devices. 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. Factors affecting sustained release drug delivery system. This phenomenon is known as ficross-linkingfl. The monomer polymerized or the monomers copolymerized. You can change your ad preferences anytime. For self-paced learning, we provide 24/7 access to CBSE Class 12 Science Chemistry textbook solutions, solved sample papers, practice tests … Intermolecular forces (between the molecules) attract polymer molecules towards each other. 5. indifference to bodily tissue and fluids. Hayden, W.G. You can change your ad preferences anytime. Multiple biological, synthetic and hybrid polymers are used for multiple medical applications. See our User Agreement and Privacy Policy. Mechanical Properties of Polymers Figure 15.17 The stress-strain curve for 6,6-nylon, a typical thermoplastic polymer. 1 Doping is a process by which the polymer is either oxidized or reduced to create charge carriers. Polymer Structure.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. The solvent in which the monomer is polymerized.

  • Good mould ability. Light scattering (LS) To 8 Shape Membrane osmometry 2x104 to 2x106 Vapor phase osmometry To 4x104 Electron and X-ray microscopy 102 to 8 Shape, dist Ebulliometry To 4x104 Cryoscopy To 5x104 End Group Analysis To 2x104 Osmodialysis … 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. SAPKAL COLLEGE OF PHARMACY (The Science and Engineering of Materials – by D.R. This chapter will emphasize the most recent … Further quality characteristics are the high stability to environmental influences during storage and absolute skin friendliness, i.e. PDF unavailable: 11: Structure and Properties of Polymers (Contd. ) The lower the molecular weight, lower the transition temperature, viscosity, and the mechanical properties. Miss.
  • Low coefficient of friction. Phule) ABS is one of the most widely used and versatile thermoplastics due to its superior hardness, toughness, gloss, and electrical and chemical resistance. Decreasing rate of deformation has the same effect as increasing temperature (T). They are found in common household goods, in clothing and toys, in construction materials and insulation, and in numerous other products. Physical testing can help raw material suppliers and manufacturers to determine the properties of their products through Intertek’s vast range of testing methods. 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. • Can resist against stretching, compression, bending, sudden stress, and dynamic loading. A typical commercial plastic resin may contain two or more polymers in addition to various additives and fillers. Scribd is the world's largest social reading and publishing site. On the basis of type, the global market is segmented into Polyaniline, Polycarbonate, Inherently Conductive Polymers, Polyphenylene-based resins and others. Clipping is a handy way to collect important slides you want to go back to later. Dept. The following variables can be controlled when producing a polymer. 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. Metals are still the most used biomaterials mostly due to their superior mechanical properties and can be found in orthopedic, cardiovascular and dental implants. oftheflowregimeinthecase ofthehighermolecularweight polymer.This isobservedexperimentallyand schematically showninFigure3. 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. The polymers expand, thicken, and harden … Low density, high corrosion resistance, electrical insulation. Now customize the name of a clipboard to store your clips. PDF unavailable: 14: Structure and Properties of Polymers (Contd.) 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. See our User Agreement and Privacy Policy. Typical stress-strain curves in tension for selected polymers are given in Figure 2. See our Privacy Policy and User Agreement for details. 11. The amount of acrylic polymer consumed with the active … The term polymer is commonly used in the plastics and composites industry, often as a synonym for plastic or resin.Actually, polymers include a range of materials with a variety of properties. Mechanical Properties Polymer Research Center Institute of . See our Privacy Policy and User Agreement for details. MECHANICAL PROPERTIES • Polymers resist differently when they are stressed. This is not to say that the package is entirely responsi-ble for shelf life retention. Low M High M • Polymers can have various lengths depending on the number of repeat units. Polymers with multiple responsive properties have also been developed elegantly combining two or more stimuli-responsive mechanisms. Some of these are China, India, and Japan are leading countries in terms of production and consumption of polymer … … (The Science and Engineering of Materials – by D.R. Based on the arrangement of repeating units in the polymer chain, different properties are observed that are beneficial for many applications [14]. 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 simplest definition of a polymer is a useful chemical made of many repeating units. III, Mechanical Behavior, John Wiley and Sons, Inc., 1965.) Relationship of polymer properties to molecular weight.1. 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. In packaging, for example, ineffective barrier properties may render the enclosed product vulnerable to surrounding environmental factors, such as water, humidity, and oxygen, including its future storage. Frequently, polymers, resins, plastics are used interchangeably. If you continue browsing the site, you agree to the use of cookies on this website. 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. They satisfy particularly stringent requirements in terms of purity. The identity and amount of the reagent used to crosslink the polymer chains. Foods deteriorate ... polymer stiffer or more resistant to chemical attack. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. 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. Polymer Properties. Polymers are a highly diverse class of materials which are available in all fields of engineering from avionics through biomedical applications, drug delivery system, biosensor devices, tissue engineering, cosmetics etc. Conductive Polymers Market to 2023: Top Companies, Trends, Growth Factors Details for Business Development - The global conductive polymers market is segmented on the basis of types and applications. Characteristics of Polymers
    • Low Density. ... material properties between various types of polymers can be • With increasing molecular weight , polymers display superior properties under an applied stress.
    • Can be produced with close dimensional tolerances. These macromolecules act as dispersants, suspending agents, thickeners, stabilizers, coagulants, flocculants, film-formers, binders, humectants, and lubricants in aqueous media. Thermal properties: Melting points high (600-4000C) Thermal conductivities are low (insulators) Thermal expansion values are low (1-15 ppm/C) 3. Network Polymer : A cross linked polymer that includes numerous interconnections between chains . 1. The … If you continue browsing the site, you agree to the use of cookies on this website. Because of their size, they have unique material characteristics, and manufactured nanoparticles have practical applications in a variety of areas. with TopperLearning’s revision materials. The temperature and pressure at which the polymerization occurs. 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 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). Janhavi Shirish Zope Nanoparticle, ultrafine unit with dimensions measured in nanometers. 3 Properties and Applications. Introduction: Organic polymers are normally insulators, it can be presumed that conducting polymers must have an unusual structure. Polymers are seldom used in their neat form, most often compounded with various additives. Typical Molecular Weight Determination Methods1; Method Type of mol. The birth of polymer science may be traced back to the mid-nineteenth century. Fundamental knowledge about the properties of the polymers in use in dentistry is an advantage as it provides information relevant to clinical practice. and mechanical properties (such as strength, stiffness, and toughness) depend on molecular weight of polymer. 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. Textbook: Plastics: Materials and Processing (Third Edition), by A. Brent Young (Pearson, NJ, 2006). • Take turns in explaining to a partner how the following molecular structures affect the overall properties of polymers :- • chain length, different side groups, chain branching, stereoregularity, chain flexibility, cross linking. The denaturing agents destroy secondary and tertiary structures, without affecting the primary structure. ... (From H.W. • Polymers are also very sensitive to the rate of deformation(strain rate). 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. A one-component, photoresponsive, self-healing polymer composite contains photoabsorbing hybrid microcapsules (PAHM). Polymers are classified as: (1) Man-made or synthetic polymers that are synthesized in the laboratory; (2) Biological polymer that are found in nature. • During the polymerization process not all chains in a polymer grow to the same length, so there is a distribution of molecular weights. Branched Polymer : Molecules having branch points that connect 3 or more segments . wt. Polymers do not melt, they change state from crystalline to semi-crystalline. Cross-Linked Polymer : It includes interconnections between chains . Thermoplastics (80%) • No cross links between chains.

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