Abstract
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 C₆F(13)(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.