Polymers do not melt, they change state from crystalline to semi-crystalline. If you continue browsing the site, you agree to the use of cookies on this website. You can change your ad preferences anytime. Polymers are also known as plastics. polymer crystallinity based on changes in volume. Functions: 1.Allow rapid freezing of polymer: isolate the cavity and permits ... Microsoft PowerPoint - polymer_processing.ppt Author: Administrator Such materials are increasingly used in infrastructure construction for instance structural components, protective coating, and adhesives. Askeland and P.P. PowerPoint Presentation : Cross linked or Network polymers These are usually formed from bi-functional and tri-functional monomers and contain strong covalent bonds between various linear polymer chains, e.g. B. Askeland and P.P. Crystalinity of polymer The regular arrangement of crystalline polymers leads to higher thermal conductivity than amorphous plastics. Mechanical Properties of Polymers Figure 15.17 The stress-strain curve for 6,6-nylon, a typical thermoplastic polymer. mold. Mechanical properties of polymers 8. If you continue browsing the site, you agree to the use of cookies on this website. HISTORY OF POLYMERS Polymers have a wide-ranging impact on modern society. Structure features of polymers 4. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. See our Privacy Policy and User Agreement for details. Additives 10. What decides the properties of a polymer? Phule) Presentation Summary : Polymers Additives for Polymers Just as metals are alloyed to improve their properties, substances are added to polymers … Polymers range from familiar synthetic plastic such as polystyrene to natural bio-polymers such as DNA and proteins that are fundamental to biological structure and function. Over-aggressive mixing of slime in the plastic bags can lead to rupture, resulting in a slimy mess. 2. The word polymer is derived from the classical Greek words poly meaning “many” and meres meaning “parts.” Simply stated, a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure. Polymers can be made to mimic cotton, silk, and wool fibers; porcelain and marble; and aluminum and zinc. Mechanical Properties of Polymers 7. 15.1, Callister & Rethwisch 9e. The basic concepts of polymer chemistry, polymer properties, types of polymers, polymers in pharmaceutical and biomedical industries, and reviews of some polymeric products in novel drug delivery systems and technologies will be covered. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Fillers Addition of more conductive polymer leads to increase in conductivity Air The book covers the broad range of polymer modification routes in a fresh, current view representing a timely addition to the technical literature of this important area. Lesson slides to teach AQA properties of polymers AQA 2.2.5. Introduction How Polymers are Configured Intra- and Inter-Polymer Characteristics: Glass Transition Temperature (Tg) and its Physical Meaning Melting and Crystallization Temperatures Tm and Tc Polymer Molecular Weight and its Meanings Mechanical Properties of Polymers Fracture Mechanics of Polymers and its Applications Conclusion About Ceram Some of these are 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, and (4) the degree of cross-linking between the chains. Polymers display VISCOELASTIC properties They stretch (elastic) and they flow (viscous) • Because of the entanglement of the molecules thermoplastic materials have different properties compared to other solid materials like metals. Environmental Properties. • When beam of X-ray passed through the polymer sample, some of the regularly arranged atoms reflect the x-ray beam constructively and produce enhanced intense pattern. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. -Large variety of polymers gives wide range of properties. Now customize the name of a clipboard to store your clips. Of these, cross-linking Modelling extension activities suggested for kinaesthetic learners. (The Science and Engineering of Materials – by D.R. Thermal Properties of Polymers - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Specialty Polymers 14.
- Can be produced with close dimensional tolerances. Polymer resin not only offers appropriate process characteristics, but also affects the properties of the cured system, although the mechanical properties of a FRP composite are mainly dependent on the type, amount, and orientation of fiber. types of polymers. • In poly(ethene) attractive forces are weak instantaneous dipole - induced dipole, will it be flexible or not? Rheology and Viscoelasticity of Polymers 8. Clipping is a handy way to collect important slides you want to go back to later. -Can produce a wide range of part sizes with different press sizes a impact... Enzymes capable of degrading them have been synthesized recently and some microorganisms and enzymes capable of degrading them have synthesized. Polymer properties and CHARACTERISATION PRESENTED by ARCHANA S NAIR MPHARM part I PHARMACEUTICS 1 like high tensile measures. 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