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本文采用活性双阴离子聚合然后连续成环的方法合成得到了设计分子量为3—20万的环型聚2-乙烯吡啶;通过凝胶渗透色谱法和稀溶液粘度法检测了环型聚合物的存在;详细研究了环型聚2-乙烯吡啶在极性和非极性溶剂中的粘度行为。实验结果表明,环型聚2-乙烯吡啶的GPC谱图与相应的线型母体聚合物的GPC谱图相比有着明显的滞后现象;实验测得环型聚2-乙烯吡啶的特性粘数比在0.58—0.70之间;环型聚2-乙烯吡啶在无水乙醇、25℃条件下的Mark-Houwink方程为[η]=1.076×10~(-2)M~(0.70)。通过实验方法的改进,有效地改善了反应条件,明显地提高了设计分子量的环型聚合物的产率。
In this paper, poly (2-vinylpyridine) with a molecular weight of 3 ~ 200,000 was synthesized by living dianionic polymerization followed by continuous ring formation. The existence of cyclic polymers was detected by gel permeation chromatography and dilute solution viscosity The viscosity behavior of cyclic poly (2-vinylpyridine) in polar and non-polar solvents was investigated in detail. The experimental results show that the GPC curve of cyclic poly (2-vinylpyridine) has obvious hysteresis compared with that of the corresponding linear matrix polymer. The intrinsic viscosity ratio of cyclic poly (2-vinylpyridine) (0.58-0.70). The Mark-Houwink equation of cyclic poly (2-vinylpyridine) in anhydrous ethanol at 25 ℃ is [η] = 1.076 × 10 -2 M ~ (0.70). Through the improvement of the experimental method, the reaction conditions are effectively improved, and the yield of the ring-shaped polymer with the designed molecular weight is obviously increased.