摘要
将稻壳用酸处理后在600℃焚烧得到纯度为99.3%、比表面积为212 m2/g的Si O2。经硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH550)改性后的Si O2为无定形态,尺寸在30～50 nm之间。将改性后的稻壳Si O2与环氧树脂复合,利用热分析方法考察了纳米复合材料在N2气氛中的热性能,并采用万能材料试验机测试其拉伸性能。结果表明:稻壳Si O2的加入能有效增加环氧树脂/稻壳Si O2纳米复合材料的热稳定性,复合材料的起始分解温度(Ti)、分解速率最大时的温度(Tmax)以及失重50%的分解温度(T50%)均高于纯环氧树脂,并随稻壳Si O2含量的增加而提高。当环氧树脂/稻壳Si O2纳米复合材料的组成相同时,KH550改性的复合材料的Ti、Tmax和T50%均比未经过KH550改性的高。随着KH550用量的增加,复合材料的T50%向高温方向移动。此外,复合材料的拉伸强度、断裂伸长率和模量也高于纯环氧树脂。
Rice husk silica with a purity of 99. 3 % and a specific surface area of 212 m^2/g was obtained by burning the HCl treated rice husk at 600 ℃. After being modified with γ-glycidyloxipropyltrimethoxysilane （KH-550）, amorphous silica particles with size ranging from 30-50 nm were used as a filler in epoxy-based nanocomposites. The thermal degradation behavior and thermal stability of the epoxy resin/SiO2 nanocomposites were studied with thermo gravimetric analysis determining the initial decomposition temperature （Ti）, temperature of maximum rate of weight loss （Tmax）, and 50 % weight loss temperature （T50%）. With increasing SiO2 content the thermal stability of epoxy resin was improved, which was further enhanced by the modification of the tensile strength, elongation at break, and modulus
出处
《中国塑料》
CAS
CSCD
北大核心
2010年第1期38-42,共5页
China Plastics
