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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.
For the MAA / MAA-MPEG comb copolymer molecules known as “First Generation Polycarboxylate Superplasticizers ” (hereafter referred to as MPEG-type PCE) , Starting from the basic theory of polymer physics, we construct the equivalent free-connection chain model, and combine the previous theoretical results and experimental data to get the mathematical model of the gyration radius, hydrodynamic radius and corresponding branching parameters of MPEG-type PCE Based on which, the following three aspects are reported: Firstly, the calculation results are compared with the experimental results in the literature to test the rationality of the model; secondly, the molecular weight, side Chain molecular weight and side chain grafting density on the radius of gyration and hydrodynamic radius of PCE molecule. Finally, combining the volume exclusion chromatographic separation theory developed in recent years, the relationship between the true molecular weight of PCE and its conventional volume exclusion chromatography “apparent molecular weight ”(Also known as GPC molecular weight) between the two analyzed.The computational model and mathematical expression proposed in this paper there is no indefinite pre-exponential factor can be used to estimate the MPEG-type PCE molecules in dilute aqueous solution In accordance with their size and GPC molecular weight estimated true molecular weight.