蠕虫状链模型下梳状共聚物分子的均方回转半径的理论分析及其在聚羧酸系减水剂分子中的应用

发布时间：2018-07-27 19:52

【摘要】：利用蠕虫状链模型对梳状共聚物分子的均方回转半径进行了理论分析,建立了回转半径与主链轮廓长度、主链持久长度、侧链轮廓长度、侧链持久长度、侧链数目以及侧链沿主链的分布情况(均匀分布和梯度分布)之间的定量数学关系.在此基础上,以被称为"第一代聚羧酸系高性能减水剂"(以下简称为MPEG-type PCE)的甲基丙烯酸(MAA)/烯酸甲酯(MAA-MPEG)梳状共聚物分子为研究对象,结合实验数据,对其聚电解质主链的持久长度进行了分析,并考察了主侧链长度、刚柔性、侧链分布、接枝密度等分子结构参数对PCE回转半径的影响,最后对模型的局限性作简要说明.梳状共聚物分子的蠕虫状链模型物理图像简洁,参数意义明确,应用于PCE分子体系时较之前所报道的柔性链模型要更为合理,能够为分析PCE的分子结构与溶液构象和吸附构象之间的关系提供更科学的视角.
[Abstract]:In this paper, the mean square radius of rotation of comb copolymer molecules is theoretically analyzed by using the worm-chain model. The radius of rotation and the length of the main chain, the length of the side chain are established. Quantitative mathematical relationship between the number of side chains and the distribution of side chains along the main chain (uniform distribution and gradient distribution). On this basis, (MAA) / MAA-MPEG comb copolymers, known as "first generation polycarboxylic acid series high performance water reducer" (hereinafter referred to as MPEG-type PCE), were used as the research object, and the experimental data were combined. The lasting length of the main chain of polyelectrolyte was analyzed, and the effects of molecular structural parameters such as length of main chain, rigid flexibility, distribution of side chain and graft density on the radius of rotation of PCE were investigated. Finally, the limitations of the model were briefly explained. The vermicular chain model of comb copolymers is simple in physical image and clear in parameter meaning. It is more reasonable when applied to PCE molecular system than the flexible chain model reported before. It can provide a more scientific perspective for the analysis of the relationship between the molecular structure of PCE and the conformation of solution and adsorption.
【作者单位】：高性能土木工程材料国家重点实验室江苏苏博特新材料股份有限公司;
【基金】：国家自然科学基金(基金号51408272,51408273) 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
【分类号】：O631;TU528.042.2

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