摘要
采用端环氧基硅油及其预反应物来改性双酚A型环氧树脂。采用热分析、扫描电镜和力学性能等测试方法系统探讨了改性方法、有机硅含量对环氧树脂性能的影响。采用端环氧基硅油直接物理共混改性的EP,其耐热性几乎不变,但力学性能下降较大。采用5份端环氧基硅油预反应物改性的环氧树脂,其玻璃化转变温度由未改性的163.23℃提高到165.90℃,拉伸强度几乎保持不变,断裂伸长率由7.6%提高到16.7%,冲击强度由20.23 kJ/m2提高到27.19 kJ/m2。拉伸断面的SEM照片表明,环氧树脂固化物显示出明显的增韧效果。
Bisphenol A epoxy resin was modified by epoxy-terminated silicone. The impact strength, tensile strength, elongation at break, and glass transition temperature of the composites were investigated. The morphology of fracture surfaces was observed uisng SEM. The effects of modification methods and silicone content on material performance were discussed. After direct mechanical blending with epoxy-terminated silicone, the thermal resistance of epoxy resin was unchanged and the mechanical properties declined clearly. When the epoxy-terminated silicone was introduced via co curing at 5 phr, the glass transition temperature of the system reached 177. 35℃, which was higher than that of unmodified epoxy resin with 2. 67 ℃. In addition to improved thermal resistance, the tensile strength almost remained unchanged and elongation at break increased from 7. 6 % to 16.7 %, and the impact strength increased from 20. 23 kJ/m2 to 27. 19 kJ/m2. A significant toughening was evidenced by the improvement of toughness and was supported by the SEM micrographs of the stretched section of cured epoxy resin.
出处
《中国塑料》
CAS
CSCD
北大核心
2010年第7期51-54,共4页
China Plastics
关键词
端环氧基硅油
环氧树脂
改性
增韧
epoxy-terminated silicone
epoxy resin
modification
toughening
