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用高效尺寸排除色谱以紫外吸收光度计寿检测器,测定了一个以正丁基锂引发的聚苯乙烯齐聚物的链长分布。讨论了端基对实验的紫外吸收响应以及理论的链长分布函数中各个半分散组分重量分数的影响。引进了一个端基改正因子以获得真实的重量链长分布。实验数据可以用两个Poisson分布的叠和精确描述。与单一Poisson分布的偏离相信是由于聚合反应物混合方式的变化所致。
Excluding chromatography with high-efficiency size With UV-vis photometer life detector, the chain length distribution of a polystyrene oligomer initiated with n-butyllithium was determined. The effects of end-groups on the UV absorption response and the weight fraction of each semicolon dispersed in the theoretical chain length distribution function are discussed. A terminal correction factor was introduced to obtain the true weight chain length distribution. Experimental data can be accurately described by the sum of two Poisson distributions. The deviation from the single Poisson distribution is believed to be due to changes in the mix of polymerization reactants.