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By American Society of Metals

This publication bargains a set of ASM guide articles on how engineering plastics are characterised by way of homes and function. It methods the topic of characterization from a common point of view of engineering layout, fabrics choice, and failure research. the 1st part int

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Bueche, J. Polym. , Vol 50, 1961, p 549 13. C. Hall, Polymer Materials: An Introduction for Technologists and Scientists, Macmillan, 1981 14. R. 1361/cfap2003p028 Copyright © 2003 ASM International® All rights reserved. org Effects of Composition, Processing, and Structure on Properties of Engineering Plastics* PLASTICS are so prevalent in our lives that it is easy to overlook the vast differences in their properties and how specialized many polymers have become. Consider the differences between aramid bulletproof vests and the polyurethane foam used in pillows.

Flexibility is also introduced by ether linkages due to the smaller atomic radius of oxygen atoms compared to Fig. 6 Random formation of carbon-carbon bond segments. Bond angle is 109° Fig. 7 Steric hindrance of ethane. Source: Ref 15 Effects of Composition, Processing, and Structure on Properties of Engineering Plastics / 35 those of carbon atoms. The structure of PDMS, one of the few commercially significant polymers without carbon on its backbone, is shown in Table 1 and Fig. 1. Cis-1,4-polybutadiene is used for flexible hose, gasketing, and rubber footwear application, while PDMS is used for embedding electrical components, high-temperature gaskets, and rubber-covered rollers for laminators.

Reaction injection molding has recently gained importance in the automotive industry for producing fascia, door panels, and fenders from solid PUR reinforced with up to 20 wt% glass fibers or glass flakes. Highly reactive liquid systems are metered and impingement mixed under high pressure, injected into a mold, and then cured in the mold. A new internal mold release technology has increased productivity and the surface quality of the finished parts. Properties of reaction-injection-molded PUR are listed in Table 8.

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