聚乙烯醇/纳米纤维素复合膜的渗透汽化性能及结构表征

将聚乙烯醇/纳米纤维素(PVA/NCC)复合膜应用于乙醇-水混合溶液的渗透汽化脱水过程,探讨了纳米纤维素对膜的溶胀性能、机械性能和渗透汽化性能的影响; 利用原子力显微镜(AFM)探测了纳米纤维素的形貌特征; 采用傅里叶变换红外光谱仪(FTIR)、扫描电镜(SEM)、差示扫描量热仪(DSC)和热重分析仪(TGA)对膜结构...

Pervaporation Properties and Characterization of Poly(vinyl alcohol)/Cellulose Nanocrystal Composite Membranes

Poly( vinyl alcohol) （PVA）/cellulose nanocrystal (NCC) composite membranes were used in the pervaporation separation of water-ethanol feed mixtures, and characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetric(DSC) and thermogravimetry (TG). Atomic force microscope (AFM) was used to characterize the cellulose nanocrystal. The characterization results demonstrated that cellulose nanocrystal (NCC） displayed slender rods and dispersed homogeneously within the PVA matrix, which could be assigned to the hydrogen bonds formed between PVA and NCC. The DSC and TG analysis demonstrated that the nanocomposite membranes exhibited a increase in melting temperature and higher thermal resistance. The nanocomposite membranes had good pervaporation properties. Among all the prepared membranes, PVA/NCC nanocomposite membrane containing 2 wt% NCC exhibited the best separation factor, whose averaged separation factor was 347 for 90wt% aqueous solution of ethanol at 80 ℃ and 24% higher than that of crosslinked PVA membrane.