丙烯酸酯在PLP-SEC中的聚合物转移和长链支化
Transfer to Polymer and Long-Chain Branching in PLP-SEC of Acrylates.
作者信息
Castignolles Patrice
机构信息
University of Mainz, Institute of Physical Chemistry, Jakob-Welder Weg 11, 55 099 Mainz, Germany.
出版信息
Macromol Rapid Commun. 2009 Dec 1;30(23):1995-2001. doi: 10.1002/marc.200900530. Epub 2009 Nov 18.
Pulsed laser polymerization (PLP) combined with size exclusion chromatography (SEC) is the method of choice for determining propagation rate coefficients. The influence of the long-chain branching in PLP-SEC is investigated using multiple-detection SEC and a recently developed method to detect long-chain branching [P. Castignolles, R. Grab, M. Parkinson, M. Wilhelm, M. Gaborieau, Polymer 2009, 50, 2373.] While little or no long-chain branching is detected in poly(n-butyl acrylate), the error in relevant molecular weights of poly(2-ethylhexyl acrylate) is large (30-100%) due to long-chain branching. Possible variations of propagation rate coefficient with alkyl groups in alkyl acrylates or with the solvent have to be reconsidered.
脉冲激光聚合（PLP）与尺寸排阻色谱（SEC）相结合是测定链增长速率系数的首选方法。使用多检测SEC和最近开发的一种检测长链支化的方法[P. Castignolles, R. Grab, M. Parkinson, M. Wilhelm, M. Gaborieau, Polymer 2009, 50, 2373.]研究了PLP-SEC中长链支化的影响。虽然在聚丙烯酸正丁酯中检测到很少或没有长链支化，但由于长链支化，聚（2-乙基己基丙烯酸酯）相关分子量的误差很大（30-100%）。必须重新考虑链增长速率系数随丙烯酸烷基酯中的烷基或溶剂的可能变化。
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