摘要
采用溶液共混法将纳米SiO2粒子分散到双酚A甲醛酚醛环氧树脂(bis-ANER)与二氧化乙烯基环己烯 (VCD)的混合物中,再与固化剂甲基六氢邻苯二甲酸酐(MHHPA)混合,制备了不同SiO2含量的bis-ANER/VCD／ MHHPA/SiO2纳米复合材料。用扫描电镜、透射电镜、材料试验机、冲击试验机、热分析法对其固化产物的断面形态、力学性能和热性能进行了研究。结果表明,纳米SiO2粒子在环氧树脂基体中的分散是均匀的,粒径在30-50 nm 左右。1．5％(质量分数,下同)的SiO2粒子分散到bis-ANER/VCD/MHHPA中使材料的拉伸、弯曲和冲击强度分别提高了112％、66％和118％,断裂伸长率由1．85％提高到3．37％,玻璃化转变温度提高了5．4℃,热降解温度略有提高,降解起始阶段反应机理与未加SiO2粒子的材料一样,符合一级反应。
Nanocomposites composed of nano-SiO2 particles and epoxy resin were prepared by dispersing nano-SiO2 particles into the mixture of bisphenol A novolac epoxy resin （bis-ANER） and vinyl cyclohexene dioxide （VCD） with methylhexahydrophthalic anhydride （MHHPA） as the curing agent. SEM and TEM showed that the dispersion of the SiO2 particles in the epoxy resin matrix was homogeneous, and the size of the SiO2 particles was between 30 and 50 nm. With incorporating 1.5 wt % nano-SiO2 particles into the bis-ANER/VCD/MHHPA, the tensile strength, flexural strength and impact strength of the composites were increased by 112 %, 66 % and 118 %, respectively, elongation at break was increased to 3.37 % from 1.85 %, and the glass transition temperature was increased by 5.4℃. The reactions in the initial thermal degradation stage of bis-ANER/VCD/MHHPA and bis-ANER/VCD/ MHHPA/SiO2 followed the first order reaction mechanism.
出处
《中国塑料》
CAS
CSCD
北大核心
2006年第5期44-48,共5页
China Plastics
