摘要
利用乙烯基三甲氧基硅烷为偶联剂,异丙醇铝(AIP)为无机前驱体,与KOH甲醇溶液改性的聚偏氟乙烯(PVDF)混合形成铸膜液,通过相转化法制备具有化学键相结合的Al2O3/PVDF杂化膜。研究了杂化制膜液体系相行为及凝胶沉淀过程动力学过程,探讨了AIP对杂化膜结构和性能影响的机理。结果表明:加入AIP后,铸膜液的粘度增加,且AIP含量的增加会改变铸膜液体系的相平衡关系,使其成为热力学不稳定体系,降低其对非溶剂的容纳能力,从而加速铸膜液的凝胶化过程。凝胶化初期成膜过程胶凝速度最快,之后随时间的延长而逐渐减慢。不同的铸膜液体系的胶凝速度不同。随着AIP含量的增多,凝胶速度增加,体系发生相分离的速度变快,但当AIP含量达到20%时,凝胶速率反而下降。
The casting solution for forming Al2O3/PVDF hybrid membrane was prepared using PVDF modified by KOH in the solution of methanol as a membrane-forming polymer, using vinyl-tfimethoxy-silicane as a coupling agent and using aluminium isopropoxide （ALP） as an inorganic precursor.Al2O3/PVDF hybrid membrane linking with chemical bond was obtained with the diy-wet inversion method. The effects of AlP on the phase behavior and gelation kinetics of the casting solution were studied so as to explore the mechanism of the influence of AlP on micro-structure of the A12Oa/PVDF hybrid membrane. Results showed that the change in the phase equilibrium of casting solution was encouraged by an increase in AIP concentration and casting solution became thermodynamic unstable, so that compatibility of the casting solution with non-solvent was decreased and the gelation rate of casting solution was accelerated. The highest gelation rate was found in the initial period of membrane formation, and then it slowed down. The gelation rates for different casting solution varied with different casting solutions. Both gelation rate and phase separation rate for the casting solutions were improved by the increases of AlP concentrations; however the gelation rate decreased when AIP concentration reached 20%.
出处
《现代食品科技》
EI
CAS
北大核心
2012年第7期801-805,共5页
Modern Food Science and Technology
