摘要
合成了一种新的带羟基的螺环原碳酸酯，根据它与ＭＤＩ或ＨＤＩ的不同配比，制备了分子量不同的预聚物，其结构得到了核磁和红外数据的证实。用示差扫描量热仪和红外跟踪环氧树脂及其与预聚物混合后的固化反应过程。当用三氯化硼一邻苯二胺作固化剂时，存在两个固化反应放热峰；而用三氯化硼单乙胺作固化剂时，仅有一个反应放热峰。由固化反应曲线可知，预聚物的结构和组成、固化反应条件对固化反应是有影响的，而分子量影响不大。红外光谱研究证明，随着螺环原碳酸酯的加入量增加，环氧基因反应的转化率增加。对固化反应历程作了初步探讨。
his paper described the Synthesis of a new spiro orthocarbonate 3,9-dihydroxymetthylene-3', 9'-diethyl--1,5,7,11-tetraoxaspiro[5,5] undecane. Upon the mole ratio of spiro ortho carbonate to MDI (HDI), the prepolymers with various molecular weights were prepared. Their structures were confirmed by proton NMR and IR data. The curing reactions of epoxy resin with or without prepolymers were followed by differential scanning calometer and IR spectroscopy. It Was found that DSC curvers showed two peaks in the case of BF33-OPDA as curing agent, and only one peak for curing agent BF3-H2NEt.The effects of prepolymers structures and curing conditions on curing reaction were observed. However,the effect of molecular weitht of prepolymer was not found obviously. It is indicated that conversion of epoxy group increased as the content of spiro orthocarbonate in epoxy resin system increased by IR spectroscopy. The mechanism of curing reaction was also discussed.
出处
《功能高分子学报》
CAS
CSCD
1995年第3期321-327,共7页
Journal of Functional Polymers
基金
国家自然科学基金
关键词
齐聚物
固化反应
螺环原碳酸酯
环氧树脂
dihydroxymetthylene-3', 9'-dietlyl-tetraoxaspiro [5, 5], Prepolymer, Curing reaction,Epoxy resin
