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Synthesis of alternating polyamideurethans by reacting diisocyanates with N,N′‐di‐(6‐hydroxy‐caproyl)alkylenediamines and N‐hydroxy‐alkyl‐6‐hydroxycaproamide
Author(s) -
Katayama Shitomi,
Horikawa Hideichi,
Ito Yoshihiro,
Gomyo Noboru,
Obuchi Yukio
Publication year - 1971
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.1971.070150402
Subject(s) - hexamethylene diisocyanate , crystallinity , diphenylmethane , polymer chemistry , polymer , polymerization , materials science , alkyl , chemistry , polyurethane , organic chemistry , catalysis , composite material
Polyamideurethans of structures I and II were prepared by reacting N,N′‐di‐(6‐hydroxycaproyl)alkylenediamines and N‐hydroxyalkyl‐6‐hydroxycaproamide with hexa‐methylene diisocyanate and 4,4′‐diphenylmethane diisocyanate:where R 1 is either a dimethylene or hexamethylene radical, and R 2 is a hexamethylene or 4,4′‐diphenylmethane radical. Polymers I and II were of a high degree of polymerization and crystallinity, had high enough melting points for practical use, and gave colorless tough films both by dry and melt castings. The polymers from hexamethylene diisocyanate were much more crystalline and thermally more stable above the melting points than those from 4,4′‐diphenylmethane diisocyanate. Polymerization conditions and characteristic properties of the resulting polymers were studied.