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Structure and thermal properties of polyether polyurethaneurea elastomers
Author(s) -
Lee Ho Kyung,
Ko Sohk Won
Publication year - 1993
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.1993.070500718
Subject(s) - elastomer , prepolymer , materials science , polymer chemistry , solvent , diamine , diphenylmethane , miscibility , polymer , chemical engineering , composite material , chemistry , organic chemistry , polyurethane , engineering , catalysis
Three series of polyether polyurethaneurea (PEUU) elastomers based on poly(tetramethylene glycol) (PTMG, MW = 1000 or 2000), 4,4′‐diphenylmethane diisocyanate (MDI), and three kinds of diamine chain extenders, i.e., 4,4′‐diaminodiphenylmethane (DAM), m ‐phenylenediamine (MPD), and p ‐phenylenediamine (PPD) were synthesized in dimethylformamide or DMF–LiCl solvent by the prepolymer method. The degree of phase separation was higher in the samples with PTMG‐2000 than in those with PTMG‐1000. Three‐dimensional hydrogen bonding between hard segments led to strong hard‐domain cohesion, but solubilized soft segment and the remaining LiCl within hard domains interfered with microstructural ordering of hard segments. According to the TG/DTA analyses, as‐cast PEUU elastomers showed two‐stage degradation behavior at a heating rate of 20°C/min in a nitrogen atmosphere. Initial degradation temperature was closely related with both hard‐segment content and microstructural ordering, i.e., most of the hard segments were degraded in the first stage and samples with less ordered hard segments degraded at a lower temperatures. © 1993 John Wiley & Sons, Inc.