The mechanical properties of a novel triblock copolymer of
polyisobutylene with alloocimene end blocks were investigated.
The material has a phase-separated morphology that gives rise to
thermoplastic elastomer behavior. The network structure deriving
from the morphology is labile to both temperature and strain,
although these changes are physical and thus reversible. At temperatures
around the glass transition of the allo domains, which is
above the orderedisorder transition, phase mixing transpires.
Although the behavior is reversible, it could limit the upper use
temperature for applications of the material. However, in addition
to the significant increase in the modulus derived from the triblock
structure, advantage can be taken of the unsaturation of the end
blocks for chemical modification that alters the physical or chemical
properties.
The mechanical properties of a novel triblock copolymer ofpolyisobutylene with alloocimene end blocks were investigated.The material has a phase-separated morphology that gives rise tothermoplastic elastomer behavior. The network structure derivingfrom the morphology is labile to both temperature and strain,although these changes are physical and thus reversible. At temperaturesaround the glass transition of the allo domains, which isabove the orderedisorder transition, phase mixing transpires.Although the behavior is reversible, it could limit the upper usetemperature for applications of the material. However, in additionto the significant increase in the modulus derived from the triblockstructure, advantage can be taken of the unsaturation of the endblocks for chemical modification that alters the physical or chemicalproperties.
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