聚羧酸系高性能减水剂分子在稀溶液中尺寸及其在体积排除色谱表征中表观分子量的模型研究

发布时间：2018-06-13 01:52

  本文选题：梳形共聚物 + 等效自由连接链　； 参考：《高分子学报》2017年06期

【摘要】：针对被称为"第一代聚羧酸高性能减水剂"(以下简称为MPEG-type PCE)的甲基丙烯酸(MAA)/烯酸甲酯(MAA-MPEG)梳状共聚物分子,从高分子物理基础理论出发,构建等效自由连接链模型,结合前人的理论结果和实验数据,得到了MPEG-type PCE分子的回转半径、流体力学半径及其相应的支化参数的数学表达式.在此基础上,报道了以下三方面的工作:首先,将计算结果与文献中的实验结果进行比较,检验模型的合理性;其次,利用所建立的数学模型考察主链分子量、侧链分子量和侧链接枝密度对PCE分子的回转半径和流体力学半径的影响;最后,结合近年来发展的体积排除色谱分离理论,对PCE分子的真实分子量与其常规体积排除色谱"表观分子量"(又被称为GPC分子量)两者之间的差异进行了分析.本文所提出的计算模型和数学表达式没有不确定的指前因子,可用来估算MPEG-type PCE分子在稀水溶液中的尺寸以及根据其GPC分子量估算真实分子量.
[Abstract]:Based on the basic theory of polymer physics, an equivalent free join chain model was constructed for the comb copolymer molecule of MAA / MAA-MPEGM, which is called "first generation polycarboxylic acid high performance water reducer" (hereinafter referred to as MPEG-type PCE-MAA-MPEG-1), which is called "first generation polycarboxylic acid high performance water reducer" (hereinafter referred to as MPEG-type PCE). Based on previous theoretical results and experimental data, the mathematical expressions of radius of rotation, radius of hydrodynamics and corresponding branching parameters of MPEG-type PCE molecule are obtained. On this basis, the following three aspects of work are reported: first, the calculation results are compared with the experimental results in the literature to test the rationality of the model; secondly, the molecular weight of the main chain is investigated by using the established mathematical model. The effects of molecular weight of side chain and branch density of side link on the radius of rotation and hydrodynamics of PCE molecule. Finally, combined with the recent development of volume exclusion chromatography separation theory, The difference between the real molecular weight of PCE molecule and the "apparent molecular weight" (also known as GPC molecular weight) of PCE molecule by conventional volumetric exclusion chromatography was analyzed. The computational model and mathematical expressions presented in this paper have no uncertain preexponential factors, which can be used to estimate the size of MPEG-type PCE in dilute aqueous solution and to estimate the true molecular weight of MPEG-type PCE based on its GPC molecular weight.
【作者单位】： 江苏苏博特新材料股份有限公司高性能土木工程材料国家重点实验室;苏州大学材料与化学化工学部新型功能高分子材料国家地方联合工程实验室;
【基金】：国家自然科学基金(基金号21204061,51408273) 高性能土木工程材料国家重点实验室开放基金(基金号2014CEM001)资助项目
【分类号】：TU528.042.2
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本文编号：2012112