HIDE THIS PAPER GRAB THE BEST PAPER 97.7% of users find it useful. Most of the polymers we encounter in our daily lives are the six polymers listed in Table 1. Examples of these are steel, cloth, and pottery. 1. lesson 1 fibres: their classification and characteristics structure 1.0 objectives 1.1 introduction 1.2 classification of fibres 1.3 natural fibres 1.4 polymeric natural fibres 1.5 man-made fibres 1.6 natural fibres vs.man-made fibres 1.7 assignments 1.7.1 class assignments 1.7.2 home assignments 1.8 summing up 1.9 possible answers to self-check questions Cite this document Summary … Download full paper File format: .doc, available for editing. Polymers can be classified in ways that reflect their chemical makeup, or perhaps more importantly, their properties and applications. sensitive than thermoplastics • Crosslinked network structure (formed from chemical bonds, To make recycling of these polymers easier, the plastics industry has adopted the codes shown. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Traditionally the three major classes of materials are metals, polymers, and ceramics. Network or cross linked polymers. Since compliance in labeling is voluntary, not all plastics are labeled for identification. Polymer Matrix Composite (PMC) is the material consisting of a polymer (resin) matrix combined with a fibrous reinforcing dispersed phase. This may be seen in Figure 2 for the nylon 6,6 sample, which is an enlarged view of the TGA results in the temperature region below the onset of degradation. i.e., in plants or animals. unsaturated polyesters, vinyl esters, epoxies, phenol formaldehyde, urethane Characteristics: • Upon application of heat, liquid resin becomes cured / rigid • Cured polymer is less temp. Use of Polymers and Its Classification - Coursework Example. Branched polymers 3. Classification of polymers. Flow mechanisms: Conveying-Drag flow-dragging along by the screw of the melt as the result of the frictional forces-equivalent to viscous drag between stationary and moving plates separated by a viscous medium.-constitute output component for the extruder.-Pressure flow-P gradient along the extruder (high P at the output end, low at the feed end Towards a rheological classification of flow induced crystallization experiments of polymer melts. 5. Many of these factors are strongly interdependent, and most are discussed in much more detail in subsequent sections of this page. Nylon polymers absorb a small amount of ambient moisture and TGA can be used to determine this level of water. At about 56 ˚C, the nylon polymer starts to evolve the small amount of moisture, (ii) Synthetic polymers The polymers which are prepared in the laboratory are known as synthetic polymers or man-made polymers, e.g., polythene, synthetic rubber, PVC, nylon-66, are called natural polymers. A standard place setting includes metal cutlery, a polymer napkin, and a ceramic dish. These classes usually have quite different sources, characteristics, and applications. Towards a rheological classification of flow induced crystallization experiments of polymer melts Citation for published version (APA): Meerveld, van, J., Peters, G. W. M., & Hütter, M. (2004). 1.2 The classification system and subsequent line call-out (specification) is intended to be a means of identifying plastic materials used in the fabrication of end items or parts. THERMOSET POLYMERS Thermosets: do not flow upon reheating, e.g. ... Characteristics of branch chain polymers - result 1) It will not flow easily when heated. Polymer classification on the basis of their structure - law On the basis of structure , polymers are divided into three types. Polymers make up many of the materials in living organisms, and they constitute the basis of certain minerals and human-made materials, such as paper and plastics. 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