摘要
为提高环氧树脂的韧性,采用氨基笼型倍半硅氧烷(POSS-NH2)改性环氧树脂。分别添加不同质量百分含量的POSS(5%、10%、20%和30%)到双酚A型环氧树脂中,经反应得到一系列杂化树脂;然后采用4,4’-二氨基二苯砜(DDS)作为固化剂固化得到含POSS的有机无机杂化材料。通过对杂化材料的冲击强度、弯曲强度进行研究,并采用SEM进行机理分析。结果表明:随着POSS含量的增加,冲击强度和弯曲强度呈先增大后下降的趋势,当POSS含量为10%时,冲击强度和弯曲强度达到最大值。SEM分析表明"裂纹钉锚"和"裂纹诱导"两种增韧机理同时存在。
Amino functionalized polyhedral oligomeric silsesquioxane（POSS） was used to modify the ep- oxy resin and improve its toughness. A series of hybrid resins were prepared through adding different POSS contents（5%, 10%, 20% and 30%） to epoxy resin, then the organic-inorganic hybrid materials were obtained using 4,4-diamino diphenyl sulfone（DDS） as curing agent. The impact strength and flexural strength of the materials were mainly studied, and the toughening mechanism was analyzed by SEM. The results show that with the increase of POSS content, the impact strength and flexural strength increase at first and then drop. When the POSS content is 10wt%, the impact strength and flexural strength both at- tain maximum. SEM results show that two toughening mechanisms of ＂crack-pinning＂ and ＂crack-induc- ing＂ coexist.
出处
《绝缘材料》
CAS
北大核心
2012年第3期40-42,46,共4页
Insulating Materials
基金
中国博士后科学基金一等资助(20090450102)
中国博士后科学基金特别资助(201003661)
长安大学基础研究支持计划(CHD2009JC083)的资助
