【摘要】 以聚乙烯醇(PVA)和正硅酸乙酯(TEOS)为原料,经溶胶-凝胶(sol-gel)法制备了不同二氧化硅(SiO2)含量的PVA/SiO2杂化膜。傅里叶变换红外光谱(FT-IR)表明,随着SiO2含量增大,1060cm-1和970cm-1处Si—O—Si特征吸收峰的相对强度逐渐加强,说明TEOS与PVA发生了交联反应;同时膜的分解温度从248℃升高到342℃。杂化膜的SiO2含量从10%增大到40%,其玻璃态温度从115℃升高到124℃。以水为溶剂,测定了杂化膜的耐溶剂性能,与PVA膜相比,杂化膜的耐溶剂性能显著提高。以质量比为0.950/0.025/0.025的环己烷/环己醇/环己酮为原料,测定杂化膜的分离性能,结果表明SiO2含量从10%增大到40%,通量从15.94 g/(m2·h)升高到75.69 g/(m2·h),环己醇的分离因子从1.8升高到2.65。更多还原

【Abstract】 Polyvinyl alcohol(PVA) / silica(SiO2) hybrid membranes with various silica contents were prepared with the sol-gel method. Fourier transform infrared(FT-IR) spectra showed that the relative intensities of Si—O—Si characteristic absorption peaks at 1060cm-1 and 970cm-1 gradually increased with increasing SiO2 content,indicating crosslinking reaction between tetraethoxysilane(TEOS)and PVA. Thermal gravimetric analysis(TGA) results showed that breakdown temperature increased from 248℃ to 342℃ along with SiO2 content rising from 0 to 40%. Differential scanning calorimetry(DSC) results showed that glass transition temperatures(Tg) rose from 115℃ to 124℃ with increasing SiO2 content from 10% to 40%. Compared with the PVA membrane,solvent resistance of PVA/SiO2 hybrid membranes was significantly improved in water. Using cyclohexane /cyclohexanol/ cyclohexanone mixture with mass fraction of 0.950/0.025/0.025 as feed,separation performance of the hybrid membrane was determined. Total flux increased from 15.94 to 75.69 g/(m2·h) and selectivity ofcyclohexanol increased from 1.8 to 2.65 with increasing SiO2 content from 10% to 40%.更多还原