环氧树脂/丙烯酸酯互穿网络聚合物及其流变性能研究

STUDY ON PREPARATION AND RHEOLOGICAL PROPERTIES OF EPOXY/ ACRYLIC ACID ESTER INTERPENETRATING POLYMER NETWORKS

采用甲基六氢邻苯二甲酸酐(MeHHPA)作为新型脂环族环氧树脂(CER)的固化剂,选用过氧化二异丙苯为三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)的引发剂,制备了一种新的CER/TMPTMA互穿网络聚合物(IPNs)。通过扫描电子显微镜表征并证实了IPNs的形成过程。研究发现,由于TMPTMA的自由基聚合反应先于CER-MeHHPA的阳离子聚合反应,得到了一种分步IPNs。利用平板转矩流变仪研究了CER、TMPTMA以及CER/TMPTMA体系固化过程中的动态流变性能。等温固化过程中的复合黏度以及弹性模量变化行为同样验证了CER/TMPTMA体系在固化过程中确实存在两个不同速度的交联反应。另外,氧化物引发剂和TMPTMA的加入缩短了CER的凝胶时间,提高了固化交联反应的表观活化能。

An novel interpenetrating polymer networks（IPNs） based on a mixture of trimethylol-1,1,1-propane trimethacrylatea（TMPTMA） cured by DCP and a di-functional cycloaliphatic epoxy monomer,3,4-epoxycyclohexylmethy-3′ 4′-epoxycyclohexane carboxylate（CER） cured by methyl hexahydrophthalic anhybride（MeHHPA） had been prepared.The forming process of IPNs had been characterized and testified by means of scanning electric microscopy（SEM）,and the experimental results showed that the radical polymerization reaction of TMPTMA monomer was prior to the cationic polymerization reaction of epoxy-anhydride system,which leaded to obtain a kind of sequential IPNs.Dynamic rheological properties of CER,TMPTMA,and CER/TMPTMA IPNs during isothermal curing reaction were studied by parallel-plate rheometer.The change behaviors of viscosity and elastic modulus during isothermal curing process also displayed that the sequential IPNs was formed indeed by two crosslinking reactions with different velocity.Additionally,the addition of DCP and TMPTMA leaded to the shortening of gelating time of CER and improvement in apparent activation energy of curing crosslinking reaction.