Chapter 31: Q27E (page 1054)
When styrene, , is copolymerized in the presence of a few percent p-divinylbenzene, a hard, insoluble, cross-linked polymer is obtained. Show how this cross-linking of polystyrene chains occurs.
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Chapter 31: Q27E (page 1054)
When styrene, , is copolymerized in the presence of a few percent p-divinylbenzene, a hard, insoluble, cross-linked polymer is obtained. Show how this cross-linking of polystyrene chains occurs.
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Draw a three-dimensional representation of segments of the following polymers:
(a) Syndiotactic polyacrylonitrile
(b) Atactic poly (methyl methacrylate)
(c) Isotactic poly (vinyl chloride)
Vinylidene chloride, H2C = CHCl, does not polymerize in isotactic, syndiotactic, and atactic forms. Explain.
The smoking salons of the Hindenburg and other hydrogen-filled dirigibles of the 1930s were insulated with urea–formaldehyde polymer foams. The structure of this polymer is highly cross-linked, like that of Bakelite (Section 31-6). Propose a structure.
Glyptal is a highly cross-linked thermosetting resin produced by heating glycerol and phthalic anhydride (1,2-benzenedicarboxylic acid anhydride). Show the structure of a representative segment of glyptal.
What is the structure of the polymer produced by the anionic polymerization of -propiolactone using localid="1658487578228" as catalyst?
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