Composition and solution properties of fluorinated block copolymers and their surface structures in the solid state  

作　　者：NI HuaGang XUE DongWu WANG XiaoFang ZHANG Wei WANG XinPing SHEN ZhiQuan 

机构地区：[1]Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education,Department of Chemistry,Zhejiang Sci-Tech University,Hangzhou 310018,China

出　　处：《Science China Chemistry》2009年第2期203-211,共9页中国科学（化学英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos. 50573069 and 20704038);Program for Changjiang Scholars and Innovative Research Team in University (Grant No.IRT 0654)

摘　　要：A series of diblock copolymers composed of methyl methacrylate and 2-perfluorooctylethyl methacry-late(PMMA144-b-PFMAn) with various PFMA block lengths were prepared by atom transfer radical po-lymerization(ATRP).The surface structures and properties of these polymers in the solid state and in solution were investigated using contact angle measurement,X-ray photoelectron spectroscopy(XPS),sum frequency generation(SFG) vibrational spectroscopy,surface tension and dynamic laser light scattering(DLS).It was found that with increasing PFMA block length,water and oil repellency de-creased,the ratio of F/C increased with increasing film depth,and the degree of ordered packing of the perfluoroalkyl side chains at the surface decreased.When the number of PFMA block units reached 10,PMMA segments were detected at the copolymer surface,which was attributed to the PFMA block length affecting molecular aggregation structure of the copolymer in the solution and the interfacial structure at the air/liquid interface,which in turn affects surface structure formation during solution solidification.The results suggest that copolymer solution properties play an important role in struc-ture formation on the solid surface.A series of diblock copolymers composed of methyl methacrylate and 2-perfluorooctylethyl methacrylate (PMMA144-b-PFMA n ) with various PFMA block lengths were prepared by atom transfer radical polymerization (ATRP). The surface structures and properties of these polymers in the solid state and in solution were investigated using contact angle measurement, X-ray photoelectron spectroscopy (XPS), sum frequency generation (SFG) vibrational spectroscopy, surface tension and dynamic laser light scattering (DLS). It was found that with increasing PFMA block length, water and oil repellency decreased, the ratio of F/C increased with increasing film depth, and the degree of ordered packing of the perfluoroalkyl side chains at the surface decreased. When the number of PFMA block units reached 10, PMMA segments were detected at the copolymer surface, which was attributed to the PFMA block length affecting molecular aggregation structure of the copolymer in the solution and the interfacial structure at the air/liquid interface, which in turn affects surface structure formation during solution solidification. The results suggest that copolymer solution properties play an important role in structure formation on the solid surface.

关 键 词：FLUORINATED BLOCK COPOLYMER surface structure SOLUTION properties air-liquid interface 

分 类 号：O631.3[理学—高分子化学]