classification of polymers flowchart

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 unsaturated polyesters, vinyl esters, epoxies, phenol formaldehyde, urethane Characteristics: • Upon application of heat, liquid resin becomes cured / rigid • Cured polymer is less temp. HIDE THIS PAPER GRAB THE BEST PAPER 97.7% of users find it useful. Read Text. Examples of these are steel, cloth, and pottery. Polymer classification on the basis of their structure - law On the basis of structure , polymers are divided into three types. are called natural polymers. Since compliance in labeling is voluntary, not all plastics are labeled for identification. Classification of Polymers Based on Source of Origin (i) Natural polymers Those polymers which occur in nature. Nylon polymers absorb a small amount of ambient moisture and TGA can be used to determine this level of water. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Polymer Matrix Composites are very popular due to their low cost and simple fabrication methods. sensitive than thermoplastics • Crosslinked network structure (formed from chemical bonds, 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. ... Characteristics of branch chain polymers - result 1) It will not flow easily when heated. At about 56 ˚C, the nylon polymer starts to evolve the small amount of moisture, These classes usually have quite different sources, characteristics, and applications. Comments (0) Add to wishlist Delete from wishlist. To make recycling of these polymers easier, the plastics industry has adopted the codes shown. Linear ploymers 2. Most of the polymers we encounter in our daily lives are the six polymers listed in Table 1. (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, Polymers can be classified in ways that reflect their chemical makeup, or perhaps more importantly, their properties and applications. Network or cross linked polymers. 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). 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. 1. Polymer Matrix Composite (PMC) is the material consisting of a polymer (resin) matrix combined with a fibrous reinforcing dispersed phase. Classification of polymers. Traditionally the three major classes of materials are metals, polymers, and ceramics. A standard place setting includes metal cutlery, a polymer napkin, and a ceramic dish. Branched polymers 3. Identification, simply by THERMOSET POLYMERS Thermosets: do not flow upon reheating, e.g. It is not intended for the selection of materials. 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. Many of these factors are strongly interdependent, and most are discussed in much more detail in subsequent sections of this page. Towards a rheological classification of flow induced crystallization experiments of polymer melts. 5. 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