气相、沉淀、稻壳SiO_2/聚乙烯醇复合膜的性能比较

Comparative Study of Performance of Fume,Precipitate and Rice Husk Silica Filled Polyvinyl Alcohol Hybrid Membranes

分别采用气相SiO2、沉淀SiO2和稻壳SiO2与聚乙烯醇(PVA)按不同的比例制备成复合膜。比较了3种不同来源的纳米SiO2/PVA复合膜的拉伸性能及耐水性能。结果表明:SiO2含量相同时,复合膜的断裂伸长率和拉伸强度的排列顺序为:气相SiO2/PVA>稻壳SiO2/PVA>沉淀SiO2/PVA;拉伸模量的排列顺序为:气相SiO2/PVA>沉淀SiO2/PVA>稻壳SiO2/PVA;3种来源的SiO2都可以提高PVA的耐水性,且耐水性随SiO2含量的增大而增强,SiO2含量相同时,复合膜的耐水性排列顺序为:气相SiO2/PVA>沉淀SiO2/PVA>稻壳SiO2/PVA。

This paper first compared the physical properties of fume, precipitate and rice husk silica. The tensile properties and water risistanee of polyvinyl alcohol（PVA）filled with these silica were studied with re- spect to filler loading and filler type. Results showed that,at the same filler loading,elongation at breaking and tensile strength of membranes changed in the following order：fume SiO2/PVA〉 rice husk SiO2/PVA 〉pre- cipitate SiO2/PVA. Tensile modulus changed in the following order： fume SiO2/PVA〉 precipitate SiO2/PVA rice husk SiO2/PVA. In addition,three sources of silica all could enhance the water resistance of PVA,which increased with the silica content. At the same filler loading, the water resistance of membranes changed in the following order： fume SiO2/PVA〉 precipitate SiO2/PVA〉 rice husk SiO2/PVA.