甲基丙烯酸-苯乙烯嵌段共聚物的XPS研究

AN XPS STUDY ON METHACRYLIC ACID-STYRENE BLOCK COPOLYMERS

对甲基丙烯酸-苯乙烯嵌段共聚物DMF溶液涂制膜(接着经过或不经其它溶剂的处理)的XPS研究表明,共聚物本体组成对膜的表面组成没有明显的影响。从DMF溶液直接涂膜时,按照两相模型,PMAA在表面的面积分数最大可达0.55。在用溶剂处理时,膜表面组成基本上决定于所用溶剂的溶解度参数,PMAA的表面面积分数按下列顺序降低:水>乙醇>环己烷>石油醚。

An XPS study was performed on films of methacrylic acid-styrene block copolymers (PMAA-b-PS) which were cast from DMF solutions, without or with subsequent solvent treatment. The results showed that the bulk compositions of the block copolymers had little, if any, influence on the surface compositions of the films. Direct casting from DMF solutions resulted in the highest fractional area coverages of PMAA at the surfaces according to a two-phase model, reaching a value of 0.55. In the cases of solvent treatment, the surface compositions were basically dependent on the solubility parameters of the solvents used and the fractional area coverages of PMAA at surfaces decreased in thee order of water >ethyl alcohol > cyclohexane > petroleum ether.