一种低熔点芳香酯型液晶环氧树脂的合成与固化  

Synthesis and curing of a liquid crystalline epoxy resin with low melting point

作　　者：周博[1] 刘国栋[2] 

机构地区：[1]天津渤海职业技术学院,天津300402 [2]河北工业大学高分子科学与工程研究所,天津300130

出　　处：《天津化工》2010年第2期18-20,共3页Tianjin Chemical Industry

基　　金：天津市自然科学基金(05YFJMJC05800);河北省自然科学基金(B2005000108)

摘　　要：本文合成了一种低熔点的芳香酯型液晶环氧树脂双4-环氧丙氧基乙氧基邻甲基对苯二酚酯(MPEPEB),并用IR、EA、1H-NMR、DSC和POM对其结构和性能进行了表征,结果表明MPEPEB在78.7℃～133.9℃之间为向列型液晶,并在降至-50℃后仍能保持液晶态。DSC研究表明,比较升温固化与等温固化的数据表明固化速率,不仅是反应温度和反应程度的函数,同时还与反应历程有关。固化后的体系具有较低的玻璃化温度,并且室温下保留的液晶结构在升温至86℃～88℃时消失。A novel triaromatic ester liquid-crystalline epoxy resin combining methyl substituent and ethoxyl flexible spacer, p-methylphenylene di {4-[（2,3-epoxypropoxy）ethoxy] benzoate} （MPEPEB）,was synthesized.The mesotropic property was investigated by differential scanning calorimetry（DSC）and polarized light optical microscopy （POM）.MPEPEB shows a lower melting temperature at 78.7℃and a broad nematic mesophase in a range of about 55℃.Meanwhile it shows mesophase till -50℃ in cooling process.The curing agent,2,6-diamino-3,5-diethyholuene （DAE）was chosen to investigate the curing behavior of MPEPEB by means of DSC and POM during isothermal and dynamic processes.During the non-isothermal curing, two exothermal peaks appeared in the DSC curves of MPEPEB/DAE.The comparison between isotheral and dynamic data shows that the curing rate is not a unique function of curing degree and temperature.The cured networks have lower glass temperatures and show mesophase at room temperature which disappear at about 86-88℃.

关 键 词：液晶环氧树脂(LCER) 熔点 固化 动力学 相行为 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]