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Thermal and mechanical properties of polyisobutylene‐based thermoplastic polyurethanes
Author(s) -
Kulkarni Pallavi,
Ojha Umaprasana,
Wei Xinyu,
Gurung Niraj,
Seethamraju Kasyap,
Faust Rudolf
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39236
Subject(s) - materials science , composite material , rheology , thermoplastic , shear rate , viscosity , shear (geology) , amorphous solid , creep , thermoplastic elastomer , polymer , copolymer , chemistry , organic chemistry
We investigated thermal and mechanical properties of thermoplastic polyurethanes (TPUs) with the soft segment comprising of both polyisobutylene (PIB) and poly(tetramethylene)oxide (PTMO) diols. Thermal analysis reveals that the hard segment in all the TPUs investigated is completely amorphous. Significant mixing between the hard and soft segments was also observed. By adjusting the ratio between the hard and soft segments, the mechanical properties of these TPUs were tuned over a wide range, which are comparable to conventional polyether‐based TPUs. Constant stress creep and cyclic stress hysteresis analysis suggested a strong dependence of permanent deformation on hard segment content. The melt viscosity correlation with shear rate and shear stress follows a typical non‐Newtonian behavior, showing decrease in shear viscosity with increase in shear rate. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 891‐897, 2013