ISSN:
0360-6376
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Model hard segments from MDI and different chain extenders have been studied by DSC. Among the studied α-ω alkane diol-type chain extenders, all giving crystalline hard segments, butane diol shows the highest melting temperature, while other types such as 1,4-diaminobutane, 1,4-benzene dimethanol, and 4,4′-methylene-bis(2-chloroaniline), so-called MOCA, have no melting endotherm in the range 30-260°C. In addition to DSC, dynamic mechanical properties were measured on linear block polyurethanes having both hard segments and soft ones of hydrogenated 1,2-polybutadiene. The hard segments in the polyurethane chains are of amorphous structure or low crystallinity, and their high-temperature behavior depends only on their strength of interaction in the amorphous state. Accordingly, MOCA shows the highest hard-block softening temperature.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1982.170200607
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