Preparation and Surface Properties Study of Novel Fluorine-Containing Methacrylate Polymers for Coating

摘要

A new structural fluorine-containing methacrylate monomer CH2=C(CH3)COOC–(CF3)2CF2CF2CF3 (>5) was synthesized derived from perfluoro-2-methyl-2-pentene (D2). A homopolymer of >5 and copolymers of >5 and methacrylate with different alkyl chain length (chain length n = 1, 2, 4, 6, 8, 12, 18) were obtained. These new fluorinated acrylate polymers showed excellent water and oil repellency. The contact angle of the films of the homopolymer and part of the copolymers were similar with the corresponding polymers prepared from CH2=CHC(O)OCH(C3F7)(CF(CF3)2), but greater than that of the C6F13(CF3)CHOC(O)CH=CH₂ homopolymer. The structure-property relationship research indicated that the copolymers’ hydrophobicity decreased first and then increased with the increase of alkyl chain length. T_d of all the polymers were greater than 220 °C and T_g fluctuated within the range of −51~103.8 °C. Contact angle and T_g could be adjusted by controlling the feed ratio of monomer to meet the requirements of technical indicators in the practical applications. The outstanding liquid repellency and thermal stability make monomer >5 a promising alternative to perfluorinated long-chain fluorosurfactants.