苯乙烯(St)与对氯甲基苯乙烯(CMS)进行自由基共聚制得共聚物(PSC),用PSC引发甲基丙烯酸十二氟庚酯进行原子转移自由基聚合(ATRP),制得含氟接枝共聚物(PGF).利用红外光谱(FT-IR)、核磁共振(~1H-NMR)、差示扫描量热(DSC)和凝胶渗透色谱(GPC)对其结构和性能进行表征.结果表明,当含氟单体转化率相近时,支链长度(M_(n,s))随PGF的支链数目增加而减少;随着M_(n,s)的增加,成膜温度对PGF疏水性能的影响越明显;M_(n,s)为1142时,PGF有83℃和94℃两个玻璃化转变温度(T_g),均比PSC的T_g (103℃)低.
A graft fluoropolymer (PGF) was synthesized by atom transfer radical polymerization (ATRP) using dodecafluoroheptyl methacrylate (DMA) as monomer, with the copolymer(PSC) of styrene(St) and 4-chloromethyl styrene(CMS) as macroinitiator, which was first synthesized by solution copolymerization at 80 ℃ with dibenzoyl peroxide as initiator. Fourier transform infrared spectroscopic (FT-IR), hydrogen nuclear magnetic resonance spectrum(~1H-NMR), differential scanning calorimetry (DSC) and gel permeation in chromatography(GPC) were used to characterize the structure of the prepared products. The results show that the number-average molecular weight of side chains (M_(n,s)) of PGF decreases as the number of side chains increases at similar DMA conversion. As M_(n,s) increases, the influence of film temperatures on the hydrophobility of PGF becomes more obvious. The graft fluoropolymer (M_(n,s)= 1142) has two glass-transition temperature (T_g)values(83 ℃ and 94 ℃), which are lower than the T_g of PSC(103 ℃).
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