聚醚型PU/GCB半有机晶体复合材料性能研究

Preparation and Properties of Polyurethane / Glycine-Calcium Bromide Semiorganic Crystal Composites

以氨基乙酸-溴化钙(GCB)半有机晶体作为分散粒子,聚四氢呋喃醚二醇(PTMG)、甲苯二异氰酸酯(TDI)为原料,二甲硫基甲苯二胺(DMTDA)为扩链剂,采用预聚法制备了聚氨酯(PU)/GCB复合材料,考察了不同扩链系数、不同GCB半有机晶体添加量的复合材料性能。结果表明,与纯PU相比,PU/GCB复合材料的拉伸强度有所提高,撕裂强度则大幅度提高;复合材料中氨酯羰基的氢键化程度提高,且加入半有机晶体GCB改善了聚氨酯材料的微相分离。

A semi-organic crystal of glycine-calcium bromide （GCB） was made by the aqueous solution evapo- ration method. Based on polytetramethylene （PTMG）, toluene diisocyanate （TDI） as raw materials, and 3,5-dim- ethyl-thioholuenediamine（DMTDA） as chain extender, and GCB crystal as dispersed particles, the polyurethane/ GCB composites were prepared using the pre-polymefization method. The performance of the composites of different chain extension coefficient and different GCB dosage was researched. The results showed that, compared with pure PU, the tear strength of PU/GCB composites increased dramatically and tensile strength increased. The hydrogen- bonding degree of urethane carbonyl groups in composites increased and the addition of GCB crystals improved the PU microphase separation.