Transfer to Polymer and Long-Chain Branching in PLP-SEC of Acrylates
Transfer to Polymer and Long-Chain Branching in PLP-SEC of Acrylates
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DOI：
10.1002/marc.200900530
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发表时间：
2009-12-01
影响因子：
4.6
通讯作者：
Castignolles, Patrice
中科院分区：
文献类型：
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作者：
Castignolles, Patrice
脉冲激光聚合 (PLP) 与尺寸排阻色谱 (SEC) 相结合是确定传播速率系数的首选方法。使用多重检测 SEC 和最近开发的检测长链支化的方法研究了 PLP-SEC 中长链支化的影响 [P. Castignolles, R. Grab, M. Parkinson, M. Wilhelm, M. Gaborieau, Polymer 2009, 50, 2373.] 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（丙烯酸 2-乙基己酯）的相关分子量误差很大（30-100%）。必须重新考虑丙烯酸烷基酯中的烷基或溶剂引起的传播速率系数可能的变化。
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.