What decides the properties of a polymer? • Chains able to slide past each other = flexible polymer . Polymer Processing 11. Conductivity decreases with increasing temp. Functions: 1.Allow rapid freezing of polymer: isolate the cavity and permits ... Microsoft PowerPoint - polymer_processing.ppt Author: Administrator Soluble Polymers Market Outlook Till, 2015-2024: Variant Market Research - Soluble polymers are organic materials that dissolve, scatter, or inflate in water. Polymers do not melt, they change state from crystalline to semi-crystalline. Polymer properties. Due to its non-toxic nature it is used Polymers are formed by linking monomers through chemical reaction — called polymerization. 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. 1. Rubber toughening is a process in which rubber nanoparticles are interspersed within a polymer matrix to increase the mechanical robustness, or toughness, of the material.By "toughening" a polymer it is meant that the ability of the polymeric substance to absorb energy and plastically deform without fracture is increased. 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. Double-bag the slime formulations or use thicker freezer bags to prevent tears. Polymers and the Environment 12. 1. What are polymers 2. The chemical structure, sources, production and synthesis methods, physical properties (mechanical, barrier Lesson slides to teach AQA properties of polymers AQA 2.2.5. No public clipboards found for this slide. 15.1, Callister & Rethwisch 9e. mold. -Large variety of polymers gives wide range of properties. Polymer: A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers) • Generally not a well defined structure, or molecular weight. Like a solid, slime can be formed into a ball and keep its shape. 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’).
  • Good corrosion resistance. Presentation Summary : The Structure and Properties of Polymers Also known as Bonding + Properties What is a polymer? 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] Polymers are materials with a seemingly limitless range of characteristics and colors. Useful comparison tables which can be supplied as handouts. Tensile strength measures the forces needed to snap a polymer. Polymers are materials with a seemingly limitless range of characteristics and colors. • Need to use statistical properties to describe. Crystalinity of polymer The regular arrangement of crystalline polymers leads to higher thermal conductivity than amorphous plastics. Askeland and P.P. Design of Polymers with Specific Properties 6. Conducting Polymer The chemistry Nobel prize in 2000 was awarded for the discovery and study of conducting polymers. Polymerization 3. Specialty Polymers 14. Download The Structure and Properties of Polymers PPT for free. Now customize the name of a clipboard to store your clips. Polymers have many inherent properties that can be further enhanced by a wide range of additives to broaden their uses and applications. -Can produce a wide range of part sizes with different press sizes. Covalent vs. supramolecular polymers Controlled properties via controlled macromolecular architectures Consideration of “cradle-to-grave” Sophisticated Plastics Polymer Chemistry, Chem 466, Spring 2014, January 14, 2014 1 Thermoplastic polymers and thermosetting polymers 5. Self-Healing Polymer. Modelling extension activities suggested for kinaesthetic learners.
  • Good mould ability. The Structure and Properties of Polymers Powerpoint Presentation .
  • Excellent surface finish can be obtained. Processing of polymers Looks like you’ve clipped this slide to already. Rubbing two polymers together can create static electrical charges which are slow to leak away to earth and cause dust collection and other problems. See our Privacy Policy and User Agreement for details. • With increasing molecular weight , polymers display superior properties under an applied stress. 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. Polymer: A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers) • Generally not a well defined structure, or molecular weight. However, slime contains over 90% water and can flow like a liquid. of Chemistry. Clipping is a handy way to collect important slides you want to go back to later. … Properties of polymers: Tg, Tacticity, Molecular weight – weight average, number average and polydispersity index.
  • Can be produced with close dimensional tolerances. Physical Properties: Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. • 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. Inter-polymer forces: There are some polymers that have weak forces between their chains, and others that have strong forces. (The Science and Engineering of Materials – by D.R. Techniques of polymerization: Bulk, emulsion, solution and suspension. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 5. Chapter 6: mechanical properties. Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Soluble polymers adapt the physical properties of aqueous methods that undergoes thickening, gellation, or stabilization/emulsification. Abstract. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Rheology and Viscoelasticity of Polymers 8. 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. Phule) because of its properties like high tensile strength, resistance to high temperatures and corrosion resistance. Differentiated questions lifted from AQA book. Methods of Polymer Characterization 13. bakelite , melamine, etc. Hydrocarbon polymers average of 100 repeating units necessary but only 40 for nylons.
  • Low coefficient of friction. Polymer crystals 7. A vast number of biodegradable polymers have been synthesized recently and some microorganisms and enzymes capable of degrading them have been identified. Some of these are Phule) 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. Electric and Optical Properties of Polymers 9. ARCHANA S NAIR The cis-double bonds in the hydrocarbon chain provide planar segments that stiffen, but do not straighten the chain. Naveed Khan. specifically made of small units bonded into long. See our Privacy Policy and User Agreement for details. • Can resist against stretching, compression, bending, sudden stress, and dynamic loading. Carbon makes up the backbone of the. The objective of this chapter is to classification of biodegradable polymers. Characteristics of Polymers
    • Low Density. Derived from its name, meaning many repeating units, polymers are often made up of branches of carbon and hydrogen chemically linked together to make a chain. Natural rubber is a completely amorphous polymer. Polymers History Of Polymers Eir PPT. van der Waals forces decide this inter-polymer force. polymer crystallinity based on changes in volume.
    • Economical. Usefulness of Polypropylene Films Mechanical Properties PMCs are very popular due to their low cost and simple fabrication methods. amorphous 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. Leads to higher thermal conductivity than amorphous plastics improve functionality and performance, others... Polymers polymers have been synthesized recently and some microorganisms and enzymes capable of degrading them have identified. Good corrosion resistance differently when they are stressed weak forces between their chains, and loading. Planar segments that stiffen, but do not straighten the chain of biodegradable polymers, density degree... Download the Structure and properties of polymer the chemistry Nobel prize in 2000 awarded... 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