改性不饱和聚酯树脂的形态和性能

MORPHOLOGY AND PROPERTY OF MODIFIED UNSATURATED POLYESTER RESIN

不饱和聚酯树脂(UPR)由于固化收缩率大和固化物韧性差而影响了它的广泛应用,继合成了同时具有增韧和降收缩效果的添加剂PMB后,本文研究了添加剂的分子量和用量、添加改性后UPR体系的固化工艺及不同UPR基体树脂等因素对固化物的微观形态和性能的影响。结果表明,PMB在多种UPR中都可以产生明显的第二相结构,PMB的分子量和用量都存在一个增韧效果的最佳值,较高的固化温度有利于第二相结构的产生。

The wide application of unsaturated polyester resin is limited by two factors, i.e. the large shrinkage and brittleness of cured material. In order to solve this problem, a series of additives were developed to improve the shrinkage and brittleness simultaneously. In this paper, the effect of molecular weight and content of additive, matrix and curing temperature on the morphology and properties of UPR were discussed. The results show that the additive PMB can separated as a dispersed phase from all UPR systems used, and there are optimal molecular weight and content of additive for the toughening of UPR, the higher curing temperature will do good to the separation of additive.