摘要
采用溶胶-凝胶(sol-gel)法由聚乙烯醇(PVA)与正硅酸乙酯(TEOS)制备杂化膜。当TEOS质量分数大于15%时,杂化溶胶液开始浑浊,呈现出一定的相分离。退火温度升高,杂化膜的溶胀度和渗透通量下降,分离因子提高。料液温度升高,膜的溶胀度和渗透通量增大,而分离因子下降。加入偶联剂γ-氨丙基三乙氧基硅氧烷(APTEOS)改善了有机相与无机相的相容性,抑制了杂化膜的相分离。TEOS与PVA中的羟基发生交联反应形成共价键Si-O-C,使得PVA中羟基减少,降低了PVA膜的结晶度。
PVA/TEOS hybrid membranes were prepared by sol-gel technique. Phase separation occurred when mass fraction of TEOS was more than 15%, and the suspension seemed to be cloudy. APTEOS was introduced to enhance the compatibility between TEOS and PVA. Both the degree of swelling （DS） and permeation flux of the hybrid membrane decreased; while separation factor increased with increasing annealing temperature. Fourier transform infrared spectroscopy （FT-IR） proved the formation of covalent bond Si-O-C. Wide-angle X-ray diffraction （WAXD） was used to observe the effect of TEOS and annealing on crystallinity.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2007年第6期160-163,168,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(50573063)
教育部博士点专项基金(20050384013)资助项目
关键词
复合膜
聚乙烯醇
渗透蒸发
composite membranes
PVA
pervaporation
