摘要
通过甲酸和双氧水将液体端羧基丁腈橡胶(CTBN)中的双键氧化,制备液体环氧化端羧基丁腈橡胶(ECTBN),并将ECTBN用于环氧树脂增韧改性的研究。详细考察了环氧化反应的影响因素,并确定了最佳的环氧化反应条件。以哌啶为固化剂,分别制备了CTBN/环氧树脂和ECTBN/环氧树脂固化物。用扫描电镜和透射电镜观察了固化物的形态结构,发现CTBN以微米尺寸分散在基体中,而ECTBN则以纳米尺寸分散在基体中。分别对固化物的拉伸性能和冲击性能进行测试,结果表明,ECTBN对环氧树脂具有更好的改性效果。用ECTBN增韧环氧树脂,复合物的冲击强度与CTBN改性复合物相当,明显高于纯树脂;杨氏模量和拉伸强度明显高于CTBN改性复合物;环氧化程度越高,复合物的强度和模量越高。
A liquid carboxyl-terminated nitrile rubber （CTBN） was epoxidized by formic acid and hydrogen peroxide, and the epoxidized CTBN （ECTBN） with different epoxidation degrees was used to toughen epoxy resin. The factors affecting the epoxidation reaction were extensively studied, and the optimum conditions were determined. CTBN/epoxy and ECTBN/epoxy blends were prepared using piperidine as curing agent. The morphology of the blends was observed by scanning electron microscopy and transmission electron microscopy, and it showed that CTBN particles dispersed in the matrix in micro- scale, whereas the ECTBN particles dispersed in nano-scale. The tensile and impact properties of these blends were measured and compared, and it was indicated that ECTBN/epoxy blends exhibited better balance properties. Epoxy resin modified by ECTBN show similar impact property with those by CTBN which both are much better than unmodified one, while its Young＇s modulus and tensile strength are much higher than those of CTBN modified epoxy resin. Upon increasing the epoxidation degree of ECTBN, both the strength and modulus of modified epoxy resions are enhanced.
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第6期702-708,共7页
Journal of East China University of Science and Technology
基金
国家自然科学基金(51073052)
