文献类型：期刊文献

中文题名：异氰酸酯与不饱和聚酯的嵌段共聚改性

英文题名：Block copolymerization modification of unsaturated polyester with isocyanate

作者：刘华[1];钱建华[2];杨文玮[1];刘坐镇[2]

机构：[1]华东理工大学材料科学与工程学院,上海200237;[2]华东理工大学华昌聚合物有限公司上海防腐蚀新材料工程技术研究中心,上海200237

年份：2010

卷号：25

期号：5

起止页码：8

中文期刊名：热固性树脂

外文期刊名：Thermosetting Resin

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD_E2011_2012】；

语种：中文

中文关键词：异氰酸酯;不饱和聚酯;嵌段共聚;改性;拉伸强度;弯曲强度

外文关键词：isocyanate ; unsaturated polyester; block copolymerization ; modification ; tensile strength ;flexural strength

摘要：通过分子结构设计先合成了低平均聚合度端羟基不饱和聚酯(UP),再与异氰酸酯(PU)共聚反应,得到了一种异氰酸酯嵌段改性不饱和聚酯树脂。通过力学性能测试和红外光谱分析研究了UP/PU共聚体各合成反应阶段分子官能团的变化,醇酸比、二元醇种类对UP齐聚物的平均聚合度和粘度的影响,UP/PU共聚体中PU链段对固化后树脂力学性能的影响以及其玻纤复合材料的性能。结果表明,UP/PU浇铸体及玻纤复合材的拉伸强度分别为75MPa,956MPa,弯曲强度分别为116MPa,1220MPa,UP/PU共聚改善了现有不饱和聚酯树脂脆性大、固化收缩率高及与玻璃纤维的粘结性差等缺点。
First a hydroxy-terminated unsaturated polyester with low average degree of polymerization（UP）was synthesized by molecular design and then a block copolymerization modified unsaturated polyester resin with isocyanate was preparead by the copolymerization of UP and isocyanate（PU）.The changes of molecular functional groups at all stages of UP /PU copolymer synthsis,effect of alcohol /acid molar ratio and diol types on the average degree of polymerization and viscosity of UP oligomer,effec of PU chains in the UP /PU copolymer on the mechanical properties of cured resin and the properties of the glass fiber compisite were investigated by the mechanincal property tests and IR analysis.The results showed that the tensile strength of UP /PU casting and glass fiber compisite were 75 MPa,956 MPa and the flexural strength were 116 MPa and 1220 MPa respectively.The existing defects of high brittleness and curing shrinkage rate and poor adhesion to glass fiber of unsaturated polyester resins were improved by UP /PU copolymerization.