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Effect of molecular weight distribution of poly(oxytetramethylene)glycol on cut growth resistance of polyurethane
Author(s) -
Kaneko Yoshio,
Watabe Yoji,
Okamoto Takeshi,
Iseda Yutaka,
Matsunaga Tsutomu
Publication year - 1980
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.1980.070251102
Subject(s) - elastomer , materials science , polyurethane , composite material , viscoelasticity , molar mass distribution , polymer
Abstract A new method is proposed to improve the cut growth resistance of polyether‐based polyurethane elastomers, i.e., polyethers used in this method are characterized by a double‐humped distribution of molecular weight (DHDM), prepared by blending low‐molecular‐weight components and high‐molecular‐weight ones. The measurements of stress–strain curves, viscoelastic properties, and DSC thermograms of polyurethane elastomers before and after fatigue tests indicate that the destruction of the super molecular structure because of fatigue is smaller in the elastomer by our method, while in the conventional elastomer it is greatly destructed to change into fibrous structure. Further, the broad line NMR measurements show that the molecular motion of DHDM‐type elastomers is more active, which is considered to contribute to the improved cut growth resistance of the elastomers.