Rheology of Star-Branched Polyisobutylene
The rheology of high molecular weight, six-arm-star polyisobutylenes (PIB) was measured and compared to the behavior of linear PIB. The polymers had equivalent plateau moduli and conformed well in the terminal zone to the time−temperature superposition principle. Moreover, the temperature coefficien...
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Published in | Macromolecules Vol. 32; no. 6; pp. 1972 - 1977 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
23.03.1999
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Subjects | |
Online Access | Get full text |
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Summary: | The rheology of high molecular weight, six-arm-star polyisobutylenes (PIB) was measured and compared to the behavior of linear PIB. The polymers had equivalent plateau moduli and conformed well in the terminal zone to the time−temperature superposition principle. Moreover, the temperature coefficients of the terminal relaxation times were identical for the star and linear polymers. Since the trans and gauche conformations in PIB have virtually the same energy, this absence of enhanced temperature sensitivity in star PIB, as well as the thermorheological simplicity, is consistent with an interpretation of the rheology of branched polymers based on an arm retraction mechanism. |
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Bibliography: | istex:709B8C041171F5F404B3D2C6FDA00F3F70E9B9AB ark:/67375/TPS-XWDP6F38-N |
ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma9815556 |