Effect of substituent position on the phase separation of poly(4-methyl-1-pentene) in diisopropylbenzene

The behaviour of poly(4-methyl-1-pentene) in a mixture of diisopropylbenzene isomers mimics that of the 1,4-isomer to an extent proportional to the amount of 1,4-isomer in the mixture. The 1,3-isomer gives the normal cloud-point curve behaviour, while the 1,4-isomer gives an anomalous one. This diff...

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Bibliographic Details
Published in:Polymer (Guilford) 1991, Vol.32 (8), p.1420-1425
Main Authors: Williams, Joel M., Hoyt, Andrea E., Wilkerson, Mark H.
Format: Article
Language:English
Subjects:
cumene
diisopropylbenzene
foam
isomers
microcellular
phase diagram
poly(4-methyl-1-pentene)
polymer
thermochromism
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Summary:The behaviour of poly(4-methyl-1-pentene) in a mixture of diisopropylbenzene isomers mimics that of the 1,4-isomer to an extent proportional to the amount of 1,4-isomer in the mixture. The 1,3-isomer gives the normal cloud-point curve behaviour, while the 1,4-isomer gives an anomalous one. This difference is reflected in the physical appearance of the foams obtained from the separated solutions. From an analysis of the solvent-to-polymer composition at the onset of this anomalous behaviour, a unique relationship is found for one 1,4-isomer molecule per methylpentene repeat unit. The observed results suggest special ordering of molecules during gelation.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(91)90422-F