氰酸酯树脂结晶性研究

Research on the crystallinity of cyanate ester resins

对氰酸酯树脂结晶性进行了研究。通过折光指数测试监控氰酸酯树脂预聚反应过程,采用凝胶色谱研究了预聚前后树脂的结构变化,通过差热扫描分析了氰酸酯体系结晶物的熔融相变。结果表明,随着预聚时间的延长,折光指数不断增加,氰酸酯树脂出现大量多聚体,结晶时间推迟;双酚E型单体的引入可降低氰酸酯树脂的熔点、增加熔限,阻止氰酸酯结晶过程。在双酚A型氰酸酯树脂中加入25%双酚E型单体,并在130℃下预聚55 m in,折光指数达1.5842时,共混体系可在室温下长时间保持液态,未出现结晶。

The crystallinity of cyanate ester resin（CE） was studied. The prepolymerization process was monitored by the refractive index test. The strcture change of CE before and after prepolymerization was investigated by GPC. The melting phase of the crystal of CE system was analyzed by DSC. The results showed that the refractive index was increased continuously and a lot of polymers were appeared in CE with the increasing of prepolymerization time and the crystal time was delayed. The introduce of bisphenol E monomers could effectively decrease the melting point, increase the melting limit of CE system and stop the crystal process of CE. The refractive index of bisphenol ACE with 25% bisphenol E monomer which prepolymerization occurred at 130℃ for 55 min was 1. 5842 and the blend could keep liquid state at room temperature for long time and had no crystals.