Abstract
The tempereture dependence of the thermal, rheological, and morphological properties of a block copolyurethane comprising hard segments formed from diphenylmethane diisocyanate (MDI) end 1,4-butanediol end soft segments based on a poly(oxyethylene-block-oxypropylene) diol of molecular weight 2300 was investigated. Crystallinity of the hard segment was eliminated by using a 50:50 mixture of 4,4'- end 2,2'-MDI. DSC data showed the existence of a microphase-separated structure with two glass transitions. Material quenched from abosvea third weak transition was homogeneous and showed only one glass transition.
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