相分离法制备超疏水聚丙烯的研究

Study on preparation of super-hydrophobic polypropylene via phase separation

利用聚合物/(溶剂-非溶剂)的相分离过程制备出了具有超疏水性能的聚丙烯(PP)薄膜,其与水的接触角可高达160°±2°。通过改变聚丙烯浓度、预处理温度以及加入弹性体,获得了伞状、圆盘夹心状及多孔粗糙小球状等不同的微观形貌,不同的微观结构分别对应了不同的疏水效果。探讨了体系相分离过程的机理及其和微观结构的关系,结果为不同的微观结构其实是由相分离过程中液/液相分离(聚合物富相/聚合物贫相)与固/液相分离(结晶)2个分离机理的相互竞争导致的。

A super-hydrophobic polypropolyene（PP） film with a contact angle up to 160°±2°is prepared via the phase separation of polymer/good-solvent/non-solvent. Different kinds of morphologies and hydrophobic properties of the film can be obtained by varying the initial concentration of PP, processing temperature or incorporation of an immiscible polymer elastomer. The mechanism of phase separation is also discussed, which reveals that the different micro-structures are caused by the competition between liquid/liquid phase separation （polymer-rich phase/polymer-poor phase） and solid/liquid （crystallization） phase separation.