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Thermal decomposition of unsaturated materials
Author(s) -
Bailey W. J.
Publication year - 1965
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.760050111
Subject(s) - isobutylene , propane , materials science , tacticity , polypropylene , thermal decomposition , polymer , ethylene , polyethylene , yield (engineering) , isobutane , ethylene propylene rubber , pentane , butane , decomposition , polymer chemistry , chemical engineering , organic chemistry , composite material , copolymer , polymerization , chemistry , catalysis , engineering
Unsaturated polymers thermally degrade by a number of different mechanisms depending on the structure of the polymer and the experimental conditions. By use of deuterium tagging it was shown that polyisobutylene degrades stepwise from the end by a cyclic unimolecular mechanism. Volatile products from isotactic polypropylene contained 75% propane at 340°, 64% n ‐pentane at 375° and 49% propylene plus 12% isobutylene at 495°. Polyethylene was shown to give mostly propylene at lower temperatures but gave a 60% yield of ethylene at 600°.