固化剂对双介晶基元液晶环氧树脂相结构和热性能的影响  

Effect of Hardeners on Phase Behavior and Thermal Properties of Dimeric Liquid Crystalline Epoxy Resins

作　　者：周德文[1,2] 梁利岩[1] 吕满庚[1] 肖婉萍[1,2] 申腾飞[1,2] 

机构地区：[1]中国科学院广州化学研究所,广州510650 [2]中国科学院研究生院,北京10049

出　　处：《高分子通报》2011年第12期122-127,共6页Polymer Bulletin

基　　金：国家自然科学基金资助项目(20974121)

摘　　要：以芳香二胺(SAA)、酸酐(THPA)和叔胺(DMAP)为固化剂,固化偶氮类双介晶基元液晶环氧树脂,采用偏光显微镜和X射线衍射研究了固化剂对液晶热固体相结构产生的影响。DMAP催化环氧自聚固化,有利于液晶分子的有序排列,易于形成梯形结构,可以得到近晶相的固化产物。SAA在较低温度下固化时也得到近晶相结构,但在较高温度固化时和THPA固化一样,得到向列相液晶结构。THPA固化时,固化剂用量较大,破坏了液晶相的有序结构,只能得到向列相结构的热固体。研究了固化产物的热性能,结果显示,三种体系的玻璃化温度SAA>DMAP>THPA,热分解温度DMAP>SAA>THPA。Three kinds of curing agents, aromatic diamine （SAA）, anhydride （THPA） and tertiary amine （DMAP）,were employed to cure the azo-type dimeric liquid crystalline epoxy resins. The phase behavior of liquid crystalline thermosets （LCTs） from different hardeners was studied by polarized optical micrograph and X-Ray Diffraction. DMAP, catalyzing the homopolymerization of epoxy groups,is helpful to the ordered arrangement of mesogens, resulting in LCTs with a smetic phase. For SAA, the smetic LCT can be obtained by cured at a low temperature, but only nematic LCTs can be prepared at high curing temperature. All the LCTs from THPA have the nematic phase. Thermal properties of the LCTs were studied by DSC and TGA. Glass transition temperatures from the three hardeners show the order of SAA〉DMAP〉THPA,and the onset temperatures of decomposition have the order of DMAP 〉SAA〉THPA.

关 键 词：固化剂 偶氮 热性能 相结构 液晶环氧 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]