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Head‐to‐head polymers 27: Thermal degradation of head‐to‐head polyisobutylene
Author(s) -
Malanga M.,
Xi F.,
Vogl O.
Publication year - 1983
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760230412
Subject(s) - isobutylene , head (geology) , monomer , materials science , yield (engineering) , degradation (telecommunications) , polymer , polymer chemistry , composite material , copolymer , telecommunications , geomorphology , computer science , geology
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 isobutylene. Surprisingly, head‐to‐head polyisobutylene also degraded, primarily to isobutylene. Liquid, low‐molecular compounds, probably dimers, were also obtained from head‐to‐tail and head‐to‐head polyisobutylene. A mechanism of this degradation is proposed.