Relationship between structure and mechanical properties in rubber‐toughened epoxy resins
Relationship between structure and mechanical properties in rubber‐toughened epoxy resins
复制标题
橡胶增韧环氧树脂的结构与机械性能之间的关系
DOI：
--
复制
发表时间：
1978
期刊：
影响因子：
--
通讯作者：
Toshiya Yoshii
中科院分区：
文献类型：
--
作者：
C. Bucknall;Toshiya Yoshii
将CTBN橡胶加入到DGEBA型环氧树脂中，制备了增韧聚合物。通过改变硬化剂的类型和浓度、树脂的初始分子量、双酚A的加入量和固化条件来改变结构。电子显微镜观察表明，这些因素影响颗粒大小和相分离的程度：快速固化抑制相分离，并产生小颗粒。直接或通过与双酚A反应增加树脂的分子量，改善相分离。橡胶相体积的动态机械测量被证明是可能的，尽管CTBN橡胶的Tg与环氧树脂中的β过程一致。用GIC法测得的抗断裂性随橡胶相体积的增加而线性增加。蠕变和屈服行为也受到相分离程度的影响。
Toughened polymers were prepared by adding CTBN rubbers to DGEBA-type epoxy resins. Structure was varied by altering the type and concentration of hardener, the initial molecular weight of the resin, the amount of Bisphenol A added, and the conditions of cure. Electron microscopy showed that these factors affected both particle size and degree of phase separation: rapid curing inhibited phase separation, and produced small particles. Increasing the molecular weight of the resin, either directly or by reaction with Bisphenol A, improved phase separation. Dynamic mechanical measurements of rubber phase volume proved possible, although Tg of the CTBN rubber coincided with a β process in the epoxy resin. Fracture resistance, measured by GIC, increased linearly with rubber phase volume. Creep and yield behaviour were also affected by the degree of phase separation.