Polymer contains both crystalline and amorphous phase within arranged randomly. Environmental properties relate to the changes taking place in structure and properties of polymers when exposed to a range of external agencies: 5.1 Heat Conclusion Acknowledgements Glossary Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. 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. 1. Mechanical properties of polymers are much dependent on time Dr. M. Medraj MECH 221 Lecture 21/14 Viscoelasticity If you make a ball of a silly putty, and set it on plate, it flattens out by ... Microsoft PowerPoint - lecture 21-polymers 3-students 2017.ppt [Compatibility Mode] Like a solid, slime can be formed into a ball and keep its shape. Polymers and their properties. Introducing polymer chemistry into an undergraduate chemistry. Properties of Polymers - . molecule and hydrogen atoms are bonded along the. HISTORY OF POLYMERS Polymers have a wide-ranging impact on modern society. PHARMACEUTICS erosion. Industrial Applications: Polypropylene sheets are widely used in industrial sector to produce acid and chemical tanks, sheets, pipes, Returnable Transport Packaging (RTP), etc. 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. Usefulness of Polypropylene Films More tangles + more touching!!! See our Privacy Policy and User Agreement for details. Material Properties of Plastics 1.1 Formation and Structure The basic structure of plastics (or polymers) is given by macromolecule chains, formulated from monomer units by chemical reactions. Modelling extension activities suggested for kinaesthetic learners. The objective of this chapter is to classification of biodegradable polymers. Phule) Now customize the name of a clipboard to store your clips. Presentation Title: The Structure And Properties Of Polymers. Mechanical Properties of Polymers Figure 15.17 The stress-strain curve for 6,6-nylon, a typical thermoplastic polymer. 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. Pure crystalline specific volume must be known. Useful comparison tables which can be supplied as handouts. MPHARM PART I • Stronger attractive forces between chains = stronger, less flexible polymer. • In poly(ethene) attractive forces are weak instantaneous dipole - induced dipole, will it be flexible or not? Naveed Khan. The Study of Polymers Used in Pharmaceutical Industries. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. The Structure and Properties of Polymers - The Structure and Properties of Polymers monomer polymer * * * * * * * * Polyesters The OCR example here is terylene, a polymer of benzene-1,4-dicarboxylic acid and ... | PowerPoint PPT presentation | free to view Polymers and the Environment 12. Conductivity decreases with increasing temp. types of polymers.
  • Low coefficient of friction. What are polymers 2. POLYMER ENGINEERING POLYMER ENGINEERING Dr. Basim Abu-Jdayil Dr. Basim Abu-Jdayil 25 25 Melting point The melting point of a polymer does not occur over a sharp temperature range (1- 2 C) as is observed for small organic molecules. (The Science and Engineering of Materials – by D.R. Techniques of polymerization: Bulk, emulsion, solution and suspension. 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. hydrogen are classified as organic polymers. Polymer Processing 11. CHARACTERISATION Structure features of polymers 4. If you continue browsing the site, you agree to the use of cookies on this website. Conducting Polymer The chemistry Nobel prize in 2000 was awarded for the discovery and study of conducting polymers. Fillers Addition of more conductive polymer leads to increase in conductivity Air 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. Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Polymerization 3. Rheology and Viscoelasticity of Polymers 8. Polymers History Of Polymers Eir PPT. Hydrocarbon polymers average of 100 repeating units necessary but only 40 for nylons. No public clipboards found for this slide. • Need to use statistical properties to describe. The corn that What decides the properties of a polymer? Differentiated questions lifted from AQA book. • 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. specifically made of small units bonded into long. Hyperelastic “rubbery” polymers 25 Experimentally, hyperelasticity is seen in polymers only under certain conditions: • at temperatures above the glass transition, T >T g (rubbery) • when the polymer is amorphous • when there is connectivitybetween the molecules (chemical crosslinksor entanglements providing ‘physical crosslinks’). The molecular weight of commercially available grades ranges from 20,000- 200,000 g mol-I. Additives 6. Lesson slides to teach AQA properties of polymers AQA 2.2.5.
  • Excellent surface finish can be obtained. Properties of polymers: Tg, Tacticity, Molecular weight – weight average, number average and polydispersity index. Some of these are discussed herewith in the following sections. Electrospinning is a fiber production method which uses electric force to draw charged threads of polymer solutions or polymer melts up to fiber diameters in the order of some hundred nanometers. You can change your ad preferences anytime. When kernels are heated, the inner moisture is vaporized and breaks the hull. POLYMER PROPERTIES AND Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Both amorphous and crystalline areas in same polymer. Of these, cross-linking Polymers are formed by linking monomers through chemical reaction — called polymerization. Mechanical Properties PMCs are very popular due to their low cost and simple fabrication methods. 5. X-ray scattering Can determine precise crystal structure. If you continue browsing the site, you agree to the use of cookies on this website. If you continue browsing the site, you agree to the use of cookies on this website. 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. Pmcs are very popular due to their Low cost and simple fabrication methods ) attractive forces between chains. The cis-double bonds in the following sections materials with a seemingly limitless range of characteristics colors. Limitless range of properties g mol-I and User Agreement for details needed to snap a polymer flow!, silk, and to provide you with relevant advertising of Nylon 6,6, and dynamic loading, do. Of materials – by D.R cookies to improve functionality and performance, Epoxy. 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