论文部分内容阅读
以n-BuLi/TMEDA(N,N,N′,N′-四甲基乙二胺)为金属化试剂,环己烷为溶剂,研究了聚苯乙烯(PS)和丁苯共聚物(SBR)的锂化反应规律,并对PS锂化反应机理进行了分析。结果表明,初始锂化反应速度与n-BuLi和聚合物浓度均呈一级关系;PS的锂化反应发生在苯环的间位上,其表观活化能为12.2kJ/mol;氢化SBR的锂化反应符合加和关系,SBR的锂化反应动力学方程式为R_p=[α(mk_(1,2)+nk_(1,4))+bk_s][n-BuLi][P]。
Polystyrene (PS) and styrene-butadiene copolymer (SBR) were studied with n-BuLi / TMEDA (N, N, N ’, N’-tetramethylethylenediamine) as a metalizing agent and cyclohexane as a solvent ) Lithiation reaction law, and PS lithiation reaction mechanism was analyzed. The results show that the initial lithiation reaction rate is in a first-order relationship with n-BuLi and the polymer concentration. The lithiation reaction of PS takes place at the meta position of the benzene ring with an apparent activation energy of 12.2 kJ / mol. The hydrogenation of SBR The lithiation reaction accords with the additive relation. The kinetic equation of lithium reaction of SBR is R_p = [α (mk_ (1,2) + nk_ (1,4)) + bk_s] [n-BuLi] [P].