摘要
采用水热法合成Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体,并应用于氰酸酯-环氧树脂(CE-EP)复合材料的增韧改性,研究Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体对CE-EP固化反应、力学性能及热稳定性的影响。XRD和SEM结果表明,所合成的Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体结晶性好、纯净、呈块状,粒径约为20nm。性能研究表明,Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体的加入对CE和EP间的固化反应速度影响不大,且不会改变树脂基体的固化反应机制。与纯CE-EP树脂体系相比,Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体/CE-EP复合材料在保持CE-EP玻璃化转变温度(Tg)的基础上明显改善了其韧性,当Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体质量分数为3wt%时,其冲击强度和弯曲强度达到最大值,较纯CE-EP树脂基体分别提高了65%和30.3%;但其热分解温度略有降低,可能是由于Ni_(0.5)Co_(0.5)Fe_2O_4铁氧体对CE-EP树脂基体高温分解的催化作用造成的。
Ni0.5Co0.5Fe2O4 ferrite nanopowders prepared by the hydro-thermal method were used to toughen cyanate ester-epoxy resin(CE-EP).The effect of Ni0.5Co0.5Fe2O4 ferrite on the curing reaction,mechanical properties and thermal stability of the CE-EP resins was studied.The XRD and SEM results indicate that the synthesized Ni0.5Co0.5Fe2O4 ferrite has good crystallinity,purity and block shape,and its particle size is about 20 nm.The performance study shows that the addition of Ni0.5Co0.5Fe2O4 ferrite has little effect on the curing reaction speed between CE and EP,and does not change the curing mechanism of the resin matrix.Compared with the pure resin system,the Ni0.5Co0.5Fe2O4 ferrite/CE-EP composites obviously improve their toughness on the basis of maintaining the glass transition temperature(Tg)of the CE-EP resins.When the Ni0.5Co0.5Fe2O4 ferrite content is 3 wt%,the impact strength and the bending strength of Ni0.5Co0.5Fe2O4 ferrite/CE-EP composites reach the maximum,which are increased by 65% and 30.3%compared with the pure resin matrix,respectively.However,the thermal decomposition temperature of the Ni0.5Co0.5Fe2O4 ferrite/CE-EP composites decreases slightly,which may be due to the catalytic effect of the Ni0.5Co0.5Fe2O4 ferrite on the decomposition of the resin matrix.
作者
李俊燕
张小苗
LI Junyan;ZHANG Xiaomiao(College of Chemistry and Material,Weinan Teachers University,Weinan 714099,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2019年第1期13-19,共7页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(21503150)
陕西省自然科学基金(2017JM2012)
关键词
铁氧体
氰酸酯
环氧树脂
增韧
热稳定性
ferrite
cyanate ester
epoxy resin
toughen
thermal stability
