氧化石墨烯/氨基硅氧烷复合气凝胶的制备与性能研究

Preparation and Performance Study of Amino-modified Siloxane-based Hybrid Aerogels with Go

以氨基硅氧烷、烷基硅氧烷和石墨烯氧化物(GO)为原料,经溶胶-凝胶-冷冻干燥法一锅法制备了一种新型氧化石墨烯/氨基硅氧烷复合气凝胶——本征氨化硅基复合气凝胶;利用红外光谱(IR)、扫描电镜(SEM)、比表面积分析(BET)、热重分析(TG)、CO_2吸附量测试(Quantity Adsorbed of CO_2)对所得气凝胶进行了结构表征确证及性能测试。所得复合气凝胶具有双互穿网络结构,含GO氨化硅基气凝胶样品热分解温度在470℃,无GO氨化硅基气凝胶样品热分解温度为360℃。两者均有较高的热稳定性。在273 K,相对压力为0.033时,无GO氨化硅基气凝胶样品CO_2吸附量为11.60 mg·g^(-1),含GO氨化硅基气凝胶样品CO_2吸附量为11.92 mg·g^(-1)。

A novel amino-modified siloxane-based hybrid aerogel with GO was obtained by a sol-gel process and vacuum freeze-drying method using amino-containing siloxanes, alkyl siloxanes and graphene oxides as raw materials. Infrared spectroscopy（IR）, scanning electron microscopy（SEM）, specific surface area analysis（BET）,thermogravimetric analysis（TG）, quantity adsorbed of CO_2 were used to characterize the structure and properties of these obtained aerogels. The testing results confirmed that the desired composite aerogels were obtained. The composite aerogels had a structure of double interpenetrating network. The thermal decomposition temperature of the siloxane-based hybrid aerogel with GO was 470℃. The thermal decomposition temperature of the siloxane-based hybrid aerogel without GO was 360℃. Both have high thermal stability. At 273 K and the relative pressure of 0.033,the adsorption amount of CO_2, siloxane-based hybrid aerogel without GO was 11.60 mg·g^（-1）, while siloxane-based hybrid aerogel with GO was 11.92 mg·g^（-1）.