作　　者： ; ; ;

机构地区： 江汉大学化学与环境工程学院

出　　处： 《化工新型材料》 2010年第5期66-68,90,共4页

摘　　要： 将稻壳用10%的盐酸处理后在600℃焚烧得到纯度为99.3%,比表面积为212g/cm2的SiO2,经硅烷偶联剂γ-氨丙基三乙氧基硅烷（KH550）改性后的SiO2为无定形态,尺寸在30~50nm。将改性后的稻壳SiO2与EP复合,对SiO2/EP纳米复合材料的热膨胀过程进行了详细的研究。结果表明：稻壳SiO2的加入,能有效降低SiO2/EP纳米复合材料的热分解性能,其降低量随稻壳SiO2含量增加而增加。纳米复合材料在玻璃态（30℃≤T≤140℃）以及在大于180℃的橡胶态,热膨胀系数随温度变化不大,而在玻璃态与橡胶态的过渡区,材料随温度升高出现收缩。进一步研究发现材料的热循环次数对纳米复合材料的热收缩现象影响较大,热循环次数的增加能消除降低材料在升温过程的中的收缩现象,并有效降低材料的热膨胀系数。 Rice husk silica with purity of 99.3% and the specific surface area value of 212 m2/g was obtained by burning the 10%（v/v）HCl treated rice husk at 600℃.After being modified with γ-glycidyloxipropyltrimethoxysilane（KH-550）,amorphous silica particles with size ranging from 30~50nm were obtained and subsequently used as filler to prepare epoxy-based nanocomposites.The thermal expansion of the nanocomposites was investigated.Depending on the silica content,the coefficient of thermal expansion（CTE） of the SiO2/EP nanocomposites can be reduced more or less compared with neat resin.When the composites was in the glassy state（30℃≤T≤130℃） or rubbery state of temperature above 180℃,the CTE hardly changed with temperature.Between the glassy and rubbery state,contraction of the materials was detected.Increasing expansion cycles can relive the contraction and reduced the CTE of the nanocomposites.

关 键 词： 稻壳 环氧树脂 纳米复合材料 热膨胀

领　　域： [化学工程]