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Curing of Polyurethane Prepolymers II‐Thermal Stability on Wool
Author(s) -
RIPPON J. A.,
WHITE M. A.
Publication year - 1972
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1972.tb03055.x
Subject(s) - prepolymer , wool , polyurethane , curing (chemistry) , materials science , composite material , thermal stability , absorption of water , resist , thermal , degradation (telecommunications) , polymer , dry heat , polymer chemistry , chemistry , organic chemistry , physics , layer (electronics) , meteorology , telecommunications , computer science
During the curing or finishing of polyurethane‐treated wool, the effectiveness of the shrink‐resist treatment can be reduced by overtreatment at high temperatures. The thermal sensitivity is greater when the polymer is uncured and increases with increasing molecular weight of the prepolymer. Under industrial conditions of steam curing, the rise of temperature on the surface of the fabric, caused by the heat of absorption of water by dry wool, is sometimes sufficient to cause loss of effectiveness. Partially polymerised prepolymer can be cured by heating alone, but further heating causes degradation. Possible mechanisms for the thermal degradation are discussed.