含有不饱和键氟聚合物的合成与表征

Synthesis of Fluoropolymer Containing Tunable Unsaturation

用商业化的偏氟乙烯-三氟氯乙烯共聚物(P(VDF-co-CTFE))为起始原料,以叔胺为催化剂制备了含有不饱和键的氟聚合物。分别用核磁共振(NMR)、热重分析(TGA)、力学性能测试等表征了所得到的聚合物。结果表明,在N-甲基吡咯烷酮(NMP)中,以三乙胺(TEA)为催化剂,消去反应可以很好地被控制;催化剂的浓度、碱性和位阻效应,溶剂的极性及其吸收HCl的能力,反应时间和反应温度影响着P(VDF-co-CTFE)的脱氯化氢反应;含不饱和键的氟聚合物可以用过氧化物固化,得到的交联氟聚合物热稳定性和抗溶剂性有所提高,同时,交联聚合物薄膜的断裂强度从原始聚合物的2.7 MPa增加到8.6 MPa,断裂伸长率则从305%增加到1131%。

Fluoropolymer with tunable unsaturation reacted via controlled dehydrochlorination of commercially available poly （vinylidene fluoride-co-chlorotrifluoroethylene） （P （VDF-co-CTFE）） under mild conditions, tertiary monoamines as catalyzer. The copolymers were characterized through nuclear magnetic resonance （NMR） and thermal gravimetric analysis （TGA）. It was shown that the elimination could be well controlled in N-methyl pyrrolidone （NMP）, catalyzed by TEA. The factors of concentration, alkalinity and steric bulk of the catalysts, the polarity and capability to absorb HC1 in solvents, and the reaction time and temperature influence the dehydrochlorination of P（VDF-co-CTFE）. The fluoropolymer containing unsaturation is readily cured with peroxide, and the crosslinked fluoropolymer exhibits improved thermostability and solvent resistance. The breaking strength of crosslinked film increases from 2.7 MPa to 8.6 MPa, and the elongation at break increases from 305% to 1131%.