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Dynamic mechanical behavior and structure of polyurethaneimides
Author(s) -
Masiulanis B.,
Hrouz J.,
Baldrian J.,
Ilavský M.,
Dušek K.
Publication year - 1987
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.1987.070340512
Subject(s) - adipate , pyromellitic dianhydride , dynamic mechanical analysis , crystallinity , materials science , polyimide , phase (matter) , polyester , polymer chemistry , chemical engineering , polymer , composite material , chemistry , organic chemistry , layer (electronics) , engineering
Dynamic mechanical behavior and X‐ray diffraction of two series of segmented polyurethaneimides (PUI) prepared either from poly(ethylene adipate) glycol (PEA), pyromellitic dianhydride (PMDA) and 4,4′‐diphenylmethane diisocyanate (MDI), or from PEA, PMDA, and a mixture of 2,4‐ and 2,6‐tolylene diisocyanate (TDI) were studied. All samples have a two‐phase structure of the soft polyester (PE) phase and hard polyimide (PI) phase. PI microdomains containing MDI units are semicrystalline, whereas those with TDI are crystalline only at highest contents of TDI. The storage modulus E ′ increases with increasing fraction of the hard phase. The MDI‐containing hard phase has a stronger effect on E ′ and also makes the plateau on the dependence of E ′ on temperature more pronounced.