热诱导相分离法制备低密度聚乙烯微孔膜——(Ⅱ)动力学因素对微孔膜结构的影响  

FORMATION OF LOW DENSITY POLYETHYLENE MICROPOROUS MEMBRANE VIA THERMALLY INDUCED PHASE SEPARATION——(Ⅱ) THE EFFECTS OF KINETIC FACTORS ON THE STRUCTURES OF MICROPOROUS MEMBRANES

作　　者：张军[1] 王晓琳[2] 骆峰[1] 许仲梓[1] 温建志 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]清华大学化学工程系,北京100084 [3]山东招远膜天集团有限公司,山东招远265400

出　　处：《高分子材料科学与工程》2005年第5期137-140,共4页Polymer Materials Science & Engineering

基　　金：国家"863"(2002AA328020);江苏省教育厅(02KJD430005)资助项目

摘　　要：选择低密度聚乙烯(LDPE)为主体材料,二苯醚(DPE)为稀释剂,研究了淬冷温度、粗化时间等影响液滴生长的动力学因素对热诱导相分离法(T IPS)制备LDPE/DPE微孔膜结构的影响。结果表明,在相同粗化时间的条件下,随着LDPE/DPE体系冷却温度的逐渐升高,孔径逐渐变大。对于质量百分数为20%LDPE/DPE体系,在结晶温度以下(0℃、30℃、60℃)粗化时,温度对微孔膜的孔径影响较小。而在90℃的恒温条件粗化时,体系始终处在液-液相分离区域,最终得到微孔膜的孔径接近5μm。在结晶温度以下(60℃)进行恒温粗化,粗化时间对微孔膜的孔径影响不大;而在结晶温度以上(90℃)进行恒温粗化时,则是随着粗化时间的延长,微孔膜的孔径逐渐变大。Hydrophobic polyethylene microporous membranes were prepared via the thermally induced phase separation （TIPS） process using low density polyethylene （LDPE） and diphenyl ether（DPE）. The effects of kinetic factors of phase separation, such as coarsening time and quenching temperature, on the microporous membranes were studied. The experimental results show that the membrane pore size of LDPE/DPE systems is increased with the increasing quenching or cooling temperature. The average size of the cells is 1μm-1.7 μm when quenching at the temperature of 0 ℃, 30 ℃ or 60 ℃ and is approximately 5μm when quenching at the temperature of 90 ℃ with coarsening time of 10 min. At the quenching temperature of 60 ℃, the droplets phase in LDPE/DPE systems hardly grows because of the temperature is below the crystalline temperature of LDPE. The diluent droplet growth is restricted by high viscosity of the system and the crystalline structure of LDPE. While at 90 ℃ cooling temperature, due to it is above the crystalline temperature of LDPE, a dramatic increase of droplets growth occurs with the increasing coarsening time.

关 键 词：低密度聚乙烯 热诱导相分离 微孔膜 二苯醚 动力学 粗化 孔径 

分 类 号：TB383[一般工业技术—材料科学与工程]