丁腈羟聚氨酯/聚环氧树脂互穿网络高聚物的研究

THE INVESTIGATION ON POLYURETHANE/POLYEPOXIDE INTERPENETRATING POLYMER NETWORKS

本文用同步法合成了丁腈羟聚氨酯/聚环氧树脂(PU/PE)体系的互穿网络高聚物(IPN),研究了各种因素对其形态和玻璃化转变行为的影响,并用扭辫及扭摆(TPA)在-100℃—+150℃温度区间内,测试全部试样的动态力学谱。结果表明,PU/PE是不相容体系,在电镜片上呈现细胞状结构(400—800A)。由于两组份网络互穿,发生“强迫互容”,使T_(g)内移,通过调整组份比和加不同扩链剂等能提高阻尼值,加宽T_(g)转变区。

In this paper,the synthesis of interpenetrating polymer networks(IPN)based on polyurethane(hydroxy terminated eopolymer of butadiene-acrylonitrile crossliked with 2,4-tolylene diisocyanate)and polyepoxide(crossliked with DMP-30)by simultaneous method and the influence of various factors on their morphology and glass transition behavior were reported.The curing condition of testing specimen was selected with the aid of JSR type curelastometer.The morphology and glass transition of the tested material were studied by transmission electron microscopy(TEM)and dynamic mechanical spectroscopy(DMS)techniques respectively and the thermostability and mechanical behavior of the sample were investigated as well.The results show that PU/PE belongs to inconsistent system.In all the cases,a two-phase morphology emerged and the celluar structure with the cell sizes ranging from 400A to 80oA was found.The damping value is increased and the zone of T_(g)transition is broadened by adjusting the constituent ratio and adding various chain extender.