Double-bag the slime formulations or use thicker freezer bags to prevent tears. The structure and properties of polymers ppt video online download. 1. Of these, cross-linking 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 Clipping is a handy way to collect important slides you want to go back to later. What are polymers 2. HISTORY OF POLYMERS Polymers have a wide-ranging impact on modern society. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Polymers can be made to mimic cotton, silk, and wool fibers; porcelain and marble; and aluminum and zinc. Crystalline polymers Areas in polymer where chains packed in regular way. Polymers are classified as: (1) Man-made or synthetic polymers that are synthesized in the laboratory; (2) Biological polymer that are found in nature. 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. molecule and hydrogen atoms are bonded along the. The Structure and Properties of Polymers monomer polymer – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 6b7132-N2RlN See our Privacy Policy and User Agreement for details. X-ray scattering Can determine precise crystal structure. These two factors can help in understanding the varied properties of polymers and also the reason why polymers are very different from materials like metals and ceramics. Polymer contains both crystalline and amorphous phase within arranged randomly. One of the great design strengths of composites is the multiple 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. Mechanical and chemical properties of polymer materials are of great importance to know before use in any construction applications. Lesson slides to teach AQA properties of polymers AQA 2.2.5. Additives 6. Phule) Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Type: ppt Physical Properties: Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. You can change your ad preferences anytime. 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. Characteristics of Polymers
- Low Density. van der Waals forces decide this inter-polymer force. Looks like you’ve clipped this slide to already. Preparation, properties and uses of Nylon 6,6, and Epoxy resin. Typical reactions for chain assembling are polyaddition (continuous or step wise) and condensation polymer-ization (polycondensation) [1] (Figure 1.1).. See our Privacy Policy and User Agreement for details. Such materials are increasingly used in infrastructure construction for instance structural components, protective coating, and adhesives. Polymers are formed by linking monomers through chemical reaction — called polymerization. Rubbing two polymers together can create static electrical charges which are slow to leak away to earth and cause dust collection and other problems. Processing of polymers properties can depend on how the polymer is MFGT 242 Flow Analysis Chapter 2:Material Properties - . Introducing polymer chemistry into an undergraduate chemistry. … Differentiated questions lifted from AQA book. Functions: 1.Allow rapid freezing of polymer: isolate the cavity and permits ... Microsoft PowerPoint - polymer_processing.ppt Author: Administrator Specialty Polymers 14. Conclusion Acknowledgements Glossary We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. • Stronger attractive forces between chains = stronger, less flexible polymer. When kernels are heated, the inner moisture is vaporized and breaks the hull. Methods of Polymer Characterization 13. Environmental Properties. * * * * * Mechanical Properties of Polymers – Stress-Strain Behavior • Fracture strengths of polymers ~ 10% of those for metals • Deformation strains for polymers > 1000% – for most metals, deformation strains < 10% brittle polymer plastic elastomer elastic moduli – less than for metals Adapted from Fig. 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. hydrogen are classified as organic polymers. specifically made of small units bonded into long.
- Economical. 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] Techniques of polymerization: Bulk, emulsion, solution and suspension. The objective of this chapter is to classification of biodegradable polymers. The corn that If a polymer becomes a melt, there is usually a range of as much as 50 C over which the viscosity of the polymer slowly changes from that of a solid to that of a liquid. Natural rubber is a completely amorphous polymer. Polymers are also known as plastics. Modelling extension activities suggested for kinaesthetic learners. Both amorphous and crystalline areas in same polymer. PRESENTED BY Inter-polymer forces: There are some polymers that have weak forces between their chains, and others that have strong forces. A long molecule made up from lots of small molecules called PPT … 1. professor joe greene csu, chico. Conducting Polymer The chemistry Nobel prize in 2000 was awarded for the discovery and study of conducting polymers. Slime has properties of both solids and liquids. Thermal Properties of Polymers - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. polymer crystallinity based on changes in volume. Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Self-healing polymers are a class of materials receiving a resurgence of interest, as there is a growing interest to integrate molecular level functionality enabling the repair of damage, impart reprocessability, or enable longer lifetimes in cross-linked polymeric materials [322–333]. Polymerization 3.
- Good corrosion resistance. Polymers are materials with a seemingly limitless range of characteristics and colors. Viscoelastic properties of polymers. Polymer properties. 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 An overview on models relating fiber diameter, process and solution parameters is given by Schubert while a novel theory is suggested predicting not onnly the fiber diameter but also its distribution. Polymers do not melt, they change state from crystalline to semi-crystalline. Use of non-reinforced polymers as structure materials is limited by low level of their mechanical properties, namely strength, modulus, and impact resistance. 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 The Structure and Properties of Polymers Powerpoint Presentation . The structure and properties of polymers. A vast number of biodegradable polymers have been synthesized recently and some microorganisms and enzymes capable of degrading them have been identified. PHARMACEUTICS The cis-double bonds in the hydrocarbon chain provide planar segments that stiffen, but do not straighten the chain. No public clipboards found for this slide. B. The molecular weight of commercially available grades ranges from 20,000- 200,000 g mol-I. Polymers have many inherent properties that can be further enhanced by a wide range of additives to broaden their uses and applications. If you continue browsing the site, you agree to the use of cookies on this website. 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. Looks like you’ve clipped this slide to already. Presentation Summary : Polymers Additives for Polymers Just as metals are alloyed to improve their properties, substances are added to polymers … Tensile strength measures the forces needed to snap a polymer. Crystalinity of polymer The regular arrangement of crystalline polymers leads to higher thermal conductivity than amorphous plastics. 2. If you continue browsing the site, you agree to the use of cookies on this website. Carbon makes up the backbone of the. Industrial Applications: Polypropylene sheets are widely used in industrial sector to produce acid and chemical tanks, sheets, pipes, Returnable Transport Packaging (RTP), etc. Polymers and the Environment 12. chains. No public clipboards found for this slide. amorphous Design of Polymers with Specific Properties 6. Reinforcement of polymers by strong fibrous network permits More tangles + more touching!!! Soluble polymers adapt the physical properties of aqueous methods that undergoes thickening, gellation, or stabilization/emulsification. • In poly(ethene) attractive forces are weak instantaneous dipole - induced dipole, will it be flexible or not? Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Self-Healing Polymer. Other factors (like strain in the polymer) can cause birefringence; Conducting polymer ppt. Polymers have many inherent properties that can be further enhanced by a wide range of additives to broaden their uses and applications. • With increasing molecular weight , polymers display superior properties under an applied stress.
- Excellent surface finish can be obtained. Polymers and their properties. • Need to use statistical properties to describe. Lesson slides to teach AQA properties of polymers AQA 2.2.5. • Chains able to slide past each other = flexible polymer . Modelling extension activities suggested for kinaesthetic learners. Usefulness of Polypropylene Films Natural rubber is a completely amorphous polymer. (The Science and Engineering of Materials – by D.R. Naveed Khan. 5. • 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. • Can resist against stretching, compression, bending, sudden stress, and dynamic loading. 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. 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. Polymer: A large molecule (macromolecule) built up by repetitive bonding (covalent) of smaller molecules (monomers) • Generally not a well defined structure, or molecular weight. The chemical structure, sources, production and synthesis methods, physical properties (mechanical, barrier (The Science and Engineering of Materials – by D.R.