聚氨酯接枝改性环氧树脂的微观结构  

Microstructure of Epoxy Resin Grafted by Polyurethane

作　　者：刘芳[1] 倪茂君[1] 陈勇军[1] 罗远芳[1] 贾德民[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510641

出　　处：《高分子材料科学与工程》2010年第6期44-47,共4页Polymer Materials Science & Engineering

基　　金：广东省自然科学基金团队项目(039172)

摘　　要：由端-NCO基聚氨酯预聚物(PU)与环氧树脂(EP)反应制备了聚氨酯接枝改性环氧树脂(EP-g-PU),考察了PU和活性稀释剂含量及异氰酸酯结构对EP-g-PU固化物玻璃化转变温度(Tg)和微观形貌的影响。结果表明,EP-g-PU固化物的Tg随PU含量增加而升高,随活性稀释剂含量增加而降低;三种异氰酸酯制备的EP-g-PU固化物的Tg顺序为IPDI>MDI>TDI。异佛尔酮二异氰酸酯(IPDI)和二苯基甲烷二异氰酸酯(MDI)型EP-g-PU固化物的断面形貌为以EP为细胞核、PU为细胞壁的两相细胞状结构,甲苯二异氰酸酯(TDI)型EP-g-PU固化物的断面形貌为PU以岛状分布于EP基体中的海岛结构,但岛相也是以EP为细胞核、PU为细胞壁的两相细胞状结构。Epoxy resins grafted by polyurethane （EP-g-PU） were prepared by reaction of NCO-terminated polyurethane prepolymer with epoxy resin.The effects of content of polyurethane and reactive diluter,diisocyanate structure on Tg and microstructure of cured EP-g-PU were investigated.The DSC results show that Tg of cured EP-g-PU increases with increasing content of polyurethane and decreases with increasing content of reactive diluter.The Tg of cured EP-g-PU derived from different diisocyanate is IPDI〉MDI〉TDI at the same conditions.The SEM results show that in fracture surface of cured EP-g-PU prepared by IPDI-polyurethane or MDI-polyurethane,epoxy resin is embedded by polyurethane to form a two-phase cell structure.Whereas,in fracture surface of cured EP-g-PU prepared by TDI-polyurethane,polyurethane as the island-phase is dispersed in epoxy resin phase to form an island-sea structure.But a two-phase cell structure of epoxy resin embedded by polyurethane is also observed in the island-phase.

关 键 词：环氧树脂 聚氨酯 接枝改性 微相形貌 

分 类 号：TQ316.343[化学工程—高聚物工业]