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Head to head polymers—38. An improved synthesis of head to head polystyrene

✍ Scribed by Enikö Földes; Gyorgy Deak; Ferenc Tüdös; Otto Vogl

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
665 KB
Volume
29
Category
Article
ISSN
0014-3057

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✦ Synopsis

A greatly improved and very reliable synthesis of head to head polystyrene (HHPS) was worked out. HHPS was prepared in a sequence of four steps starting with a reductive photodimerization of acetophenone. The resultant 2,3-diphenyl-2,3-butanediol was dehydrated in vacuum to 2,3-diphenyl-1,3butadiene, which was polymerized to i,4-poly(2,3-diphenyl-l,3-butadiene) (PDPBD). PDPBD was then hydrogenated (reduced) with potassium and ethanol to HHPS.

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## Abstract Head‐to‐head polyisobutylene degrades at a maximum rate at 320°C, a temperature about 65°C lower than head‐to‐tail polyisobutylene. Under our conditions, head‐to‐tail (the regular polyisobutylene) degrades (as do many other disubstituted vinyl monomers) to a high yield of the monomer is