两亲接枝共聚物PS-g-N-PEO的合成及表面性能研究——铸膜溶剂及浓度的影响

采用大分子单体法合成了一系列聚苯乙烯接枝壬基酚聚氧乙烯 (PS g NPEO)两亲共聚物 ,采用溶液铸膜法将其在PET表面制膜 ,并利用扫描电子显微镜 (SEM) ,X射线光电子能谱 (XPS) ,衰减全反射红外光谱(ATR)和水接触角 (CA)等手段研究了共聚物组成、铸膜溶剂及浓度对共聚物膜表面形貌、组成及水浸润性能的影响 .结果表明 ,两亲接枝共聚物在不同条件下可形成规则的表面微孔 ,共聚物中NPEO含量越高 ,共聚物膜表面微孔孔径越大 ,对应的水接触角越小 .以THF为铸膜溶剂时 ,制膜浓度越大 ,共聚物膜表面微孔孔径越大 ,对应的水接触角越小 ;而以甲苯为溶剂时 ,制膜浓度对共聚物膜表面形貌影响不大 ,但水接触角要较THF体系显著降低 ,水接触角与浓度关系与THF体系相反 ,制膜浓度越大 ,对应的水接触角越大 .制膜浓度相同时 ,THF作溶剂 ,共聚物膜微孔较大 ,表面亲水组分含量较低 ;以甲苯为溶剂 ,微孔较密 ,表面亲水组分较高 .

THE SYNTHESIS AND SURFACE CHARACTERIZATION OF AMPHIPHILIC GRAFT COPOLYMER PS-g-NPEO--THE INFLUENCE OF SOLVENT AND SOLUTION CONCENTRATION

Amphiphilic graft copolymer polystyrene-graft-nonylphenoxy-poly(ethylene oxide) (PS-g-NPEO 40) has been synthesized by the radical solution copolymerization of macromonomer NPEO-MA with styrene.By the method of coating-evaporating,amphiphilic graft copolymer films were prepared with THF or toluene as solvents on PET matrix.By means of SEM,XPS,ATR and contact angle measurements,effects on the surface morphology,the surface composition and the surface wetting were investigated.The results showed the formation of regular micropores in amphiphilic graft copolymer films under different conditions.With the increasing of NPEO content,the size of micropores increased and the wetting of polymeric film became better.With the increasing of the solution concentration,the diameter of micropores increased,which makes the wetting of polymeric film better.While in toluene,the influence of the solution concentration on surface morphology was weak,but the relationship of contact angle and concentration was opposite to that in THF,i.e.,with the increasing of concentration,the wetting of amphiphilic graft copolymer film became worse.In the same solution concentration,the diameter of micropores of polymeric film in THF was bigger than that in toluene and the hydrophilic composition in THF was less than that in toluene.