聚合物的分子量对浸没沉淀法制备聚偏氟乙烯(PVDF)微孔膜结构和结晶具有较大影响.随着聚合物分子量的增大,所成膜上表面孔尺寸和孔密度有减小的趋势.分子量较大的PVDF所成膜的底面及膜内指状孔表面均为完全无孔致密结构.断面指状孔下方为相互连通的海绵状结构.当聚合物的分子量较低时,断面开始由相互连通的海绵状结构向胞腔状结构过渡.由低分子量的PVDF制得的膜,结晶类型既有α型结晶,又有β型结晶.由高分子量的PVDF制得的膜,主要为α型PVDF结晶.后者的结晶度明显大于前者.
参考文献
| [1] | Yeow ML.;Liu YT.;Li K. .Morphological study of poly(vinylidene fluoride) asymmetric membranes: Effects of the solvent, additive, and dope temperature[J].Journal of Applied Polymer Science,2004(3):1782-1789. |
| [2] | 陆茵,陈欢林,李伯耿.溶剂浓度对PVDF相转换膜大孔结构的影响[J].高分子学报,2003(06):852-857. |
| [3] | Wang XY;Zhang L;Sun DH;An QF;Chen HL .Effect of coagulation bath temperature on formation mechanism of poly(vinylidene fluoride) membrane[J].Journal of Applied Polymer Science,2008(3):1656-1663. |
| [4] | Xuyun Wang;Lin Zhang;Dahai Sun .Formation mechanism and crystallization of poly(vinylidene fluoride) membrane via immersion precipitation method[J].Desalination: The International Journal on the Science and Technology of Desalting and Water Purification,2009(1/3):170-178. |
| [5] | Dar-Jong Lin;Konstantinos Beltsios;Tai-Horng Young;Yi-Su Jeng;Liao-Ping Cheng .Strong effect of precursor preparation on the morphology of semicrystalline phase inversion poly(vinylidene fluoride) membranes[J].Journal of Membrane Science,2006(1/2):64-72. |
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