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Effects of number‐average molecular weight of liquid hydroxyl‐terminated polybutadiene on physical properties of the elastomer
Author(s) -
Ono Katsuhiro,
Shimada Hidetoshi,
Nishimura Toshihide,
Yamashita Shinzo,
Okamoto Hiroshi,
Minoura Yuji
Publication year - 1977
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.1977.070211204
Subject(s) - polybutadiene , elastomer , hydroxyl terminated polybutadiene , materials science , ultimate tensile strength , tear resistance , modulus , elongation , molar mass distribution , polymer chemistry , composite material , polymer , copolymer
The relationship between the molecular weight of liquid hydroxyl‐terminated polybutadiene (HTPB) and the physical properties of the elastomers were investigated. HTPB having various molecular weights were cured with 4,4′‐diphenylmethane diisocyanate (MDI) by the one‐shot method and the physical properties of these elastomers obtained were measured. The tensile strenght, modulus, tear resistance, and the hardness decreased with increase in the molecular weight of HTPB, and this phenomenon was remarkable in the low molecular weight HTPB (below about 3000). On the other hand, the ultimate elongation increased linearly with increase in the molecular weight of HTPB. The effects of incorporating a short‐chain diol, N,N‐bis(2‐hydroxypropyl)aniline, on the physical properties on the elastomers are also discussed.