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By Alfred Rudin

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Extra resources for Elements of Polymer Science & Engineering, Second Edition: An Introductory Text and Reference for Engineers and Chemists

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If the polymer molecule is stiff, it will have less tendency to coil up on itself, and most segments of a given molecule will contact segments of other macromolecules. A prime example is the aromatic polyamide structure: H H I /-^ I -fNH@hN-CH§)-C^ 0 1-23 Dispersions of this polymer in sulfuric acid are spun into fibers which can be stretched to two or three times their original lengths. The products have extremely high strength, even at temperatures where most organic compounds are appreciably decomposed.

34 I Introductory Concepts and Definitions PROBLEMS An ounce of practice is worth a pound of preaching. —Proverb 1-1. Show the repeating unit which would be obtained in the polymerization of the following monomers: (o) H 1 CH^—C—COCH3 CH3 (b) H^C — C — C H 3 0 H 1 (c) CH5—C—OC—CH, H 1 (d) C H j — C — C H j — 0 — C — C H 3 0 H 1 ^>^^C —CH^ 1-2. 0 Show the repeating unit which would be obtained by reacting the following: (0) H00C(CH2)^C00H ond H2N(CH2)^NH2 (b) HOCH2CH2 CH2CH2OH ond HOOC - ^ ^ COOH (c) CH3 Jk^NCO (Oj -^ HOCH2 — CHj— CH2OH NCO H (d) CH2 — C H and CH2— C— CN (^ (e) HOCH2CH2CH2CH2OH ond CI— C - ^ o V " C—CI 0 0 Problems 1-3.

In this case, the rubber in a polybutadiene-in-water emulsion is swollen with a mixture of styrene and acrylonitrile monomers, which are then copolymerized in situ under the influence of a water-soluble free-radical initiator. The dried product is a blend of polybutadiene, styrene-acrylonitrile (usually called SAN) copolymer, and grafts of SAN on the rubber. The graft itself is a random copolymer. 4 Block Copolymer Block copolymers have backbones consisting of fairly long sequences of different repeating units.

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