端羟基芳香酯二醇扩链的聚氨酯－酯的DSC研究

端羟基芳香酯二醇扩链的聚氨酯－酯的ＤＳＣ研究陈静，余学海，杨昌正（南京化工学院应化系南京２１０００９）（南京大学化学系南京２１００９３）关键词嵌段聚醚聚氨酯－酯，结晶性，微观相结构，差示扫描量热法，形态结构众所周知，聚氨酯嵌段共聚物是一类结构特殊、用...

DIFFERENTIAL SCANNING CALORIMETRY ANALYSIS OF MORPHOLOGICAL CHANGES IN POLY(URETHANE-ESTER)

Morphological changes which are induced in poly(urethane-ester)by annealing and quenching are studied using DSC analysis technique. The samples used in this study are polyether polyurethane elastomers based on either MDI/BHET or MDI/BHET-D hard segments combined with PTMO (Mw=1000) as soft segment,and hard segment homopolymers of MDI/BHET and MDI/BHET-D.DSC measurements taken immediately after the quench show that the soft segment Tg is higher than that of the control,suggesting that the applied thermal history promoted increasing mixing of hard and soft segments. Three endotherms are observed in untreated sample at high temperature range.They are attributed to short-range,long-range and microcrystalline ordering of hard segment domains.