CAJ | 학술논문

制备了聚偏二氟乙烯(PVDF)(质量分数10%，下同)／聚乙二醇400(PEG400)(0，1%，3%，5%)／N，N–二甲基乙酰胺(DMAC)铸膜液，并在 PVDF 板上刮制成薄膜层。研究不同含量 PEG400对 PVDF 膜结构形貌和结晶的影响。结果表明，PEG400质量分数低于5%时，PEG400能改善膜表面的孔隙率。膜表面的结构影响膜横截面形貌，致密膜表面易得到指状孔横截面，而多孔膜表面则易得到内部均匀结构。同时随着 PEG 浓度的增大，铸膜液发生由贫聚合物相小液滴聚结而形成多孔胞腔状结构到富聚合物成核长大的变化过程。PEG400影响 PVDF 的结晶行为，使其结晶度随着 PEG400含量的增加而下降，并与 PVDF 析出形貌相关。致孔剂 PEG400能有效改善膜形貌结构以及孔隙率，相对而言，小分子量 PEG400使 PVDF 膜不易形成贯穿膜底部的指状孔结构。
제비료취편이불을희(PVDF)(질량분수10%，하동)／취을이순400(PEG400)(0，1%，3%，5%)／N，N–이갑기을선알(DMAC)주막액，병재 PVDF 판상괄제성박막층。연구불동함량 PEG400대 PVDF 막결구형모화결정적영향。결과표명，PEG400질량분수저우5%시，PEG400능개선막표면적공극솔。막표면적결구영향막횡절면형모，치밀막표면역득도지상공횡절면，이다공막표면칙역득도내부균균결구。동시수착 PEG 농도적증대，주막액발생유빈취합물상소액적취결이형성다공포강상결구도부취합물성핵장대적변화과정。PEG400영향 PVDF 적결정행위，사기결정도수착 PEG400함량적증가이하강，병여 PVDF 석출형모상관。치공제 PEG400능유효개선막형모결구이급공극솔，상대이언，소분자량 PEG400사 PVDF 막불역형성관천막저부적지상공결구。
Different casting solutions of polyvinylidene fluoride(PVDF) (10%,mass fraction)/polyethylene glycol400 (PEG400)(0,1%,3%,5%)/N,N–two methyl acetamide(DMAC) were prepared,and thin film layers were coated on PTFE plate. The influences of different content PEG400 on the morphology structure and the crystallization of PVDF membrane was studied. The results show that when the content of PEG400 is below 5%,PEG400 could enhance the porosity of the membrane surface. The structure of the membrane surface affect cross-section morphology of the membrane,dense membrane surface is easy to form the finger-hole in the cross section,besides,porous membrane surface is easy to get homogeneous internal structure. At the same time,with the PEG400 concentration increasing,the casting prefer to the rich polymer nucleation process instead of a process of the polymer lean phase droplets coalesce to form a porous cellular structure. PEG400 could influence the crystallization behavior of PVDF,the crystallinity of PVDF decrease with the increase of PEG400 content,associated with PVDF precipitation morphology. Pore forming agent PEG can effectively improve the film morphology structure and porosity,relatively speaking,small molecular weight PEG is not easy to make PVDF film forming the finger like pore structure through the bottom of membrane.