双酚A型氰酸酯/端羧基丁腈橡胶共混物的制备工艺和性能  

Curing Process and Properties of BCE/CTBN Blends

作　　者：朱雅红[1] 马晓燕[1] 颜红侠[1] 黄韵[1] 姚雪莉[1] 

机构地区：[1]西北工业大学理学院应用化学系

出　　处：《航空学报》2005年第6期759-763,共5页Acta Aeronautica et Astronautica Sinica

基　　金：陕西省自然科学基金(N4CS0003);西北工业大学研究生创业种子基金(Z20040060)资助项目

摘　　要：采用液体端羧基丁腈橡胶(CTBN)与氰酸酯树脂(BCE)共混以改善氰酸酯树脂的韧性,利用凝胶时间法、示差扫描量热法(DSC)和傅立叶红外光谱法(FTIR)确定BCE/CTBN的固化工艺,通过透射电子显微镜对微相结构进行了分析,研究了不同制备工艺对改性后树脂体系微相结构和力学性能的影响规律。结果表明,分别采用固化前对BEC/CTBN施加高速剪切力和预聚氰酸酯的方法可有效解决CTBN增韧BCE树脂中存在的宏观相分离问题;施加高速剪切力后,体系(每100份BCE中含10份CTBN)冲击韧性可达到14.4 kJ.m-2,比改性前(冲击韧性为6.0 kJ.m-2)提高了140%;预聚氰酸酯后,体系冲击韧性可达到12.1 kJ.m-2,比改性前提高了102%。研究还发现,工艺改进后,共混体系中以分散相存在的CTBN粒子形成胞状结构,这些含有包埋物的胞状CTBN颗粒有利于提高BCE树脂基体的韧性和强度。Carboxyl terminal functionality on liquid butadiene-acrylonitrile （CTBN） is used to improve the mechanical properties of cyanate ester resin by blending with bisphenol A dicyanate ester（BCE）. The curing process is based on gel time of BCE/CTBN blends and analysis of differential scanning calorimetry （DSC） and Fourier transform infrared （FTIR）. The influence of curing process on structures and properties of BCE/CTBN are studied. Morphology of broken specimens are examined by transmission electron microscopy （TEM）. Firstly, it is shown that macroscopical phase separation of BCE/CTBN blends can be improved by two ways, which are applying fast force to the BCE/CTBN blends and pre-polymerizing the BCE before curing process. Secondly, the modified system shows much higher impact thoughness. The two ways mentioned above lead to 140% and 102% increase in impact thoughness, respectively. Thirdly, it is shown that the modified system includes typical cystiform CTBN particulates,which is beneficial to increasing the flexural strength and impact thoughness of BCE.

关 键 词：聚合物基复合材料 工艺 性能 氰酸酯树脂 端羧基丁腈橡胶 微相 

分 类 号：V258[一般工业技术—材料科学与工程] TQ323.5[航空宇航科学与技术—航空宇航制造工程]