探讨了酸醇（-COOH/-OH）物质的量比、催化剂（对甲苯磺酸）用量和反应温度对甲氧基聚乙二醇单醚（MPEG）和丙烯酸（AA）之间的酯化率的影响。在相同的反应时间,随着酸醇物质的量比、对甲苯磺酸用量的增加和反应温度升高,酯化率提高。聚丙烯酸接枝甲氧基聚乙二醇共聚物（PAA-g-MPEG）组成比与投料比较接近。甲氧基聚乙二醇单醚丙烯酸酯（MPEGAA）的热分解主要在320℃-450℃范围,其最大热分解速率出现在417.5℃。PAA-g-MPEO中的支链热降解和主链脱羧分别发生在330℃-425℃和425℃-460℃范围,其最大热分解速率分别出现在393℃和440℃。
Effect of the molar ratio of acid to alcohol（-COOH/-OH）,the dosage of paratoluenesulfonic acid as catalyzer and the reaction temperature on esterification rate between polyethylene glycol monomethoxyl ether（MPEG） and acrylic acid（AA） was investigated,respectively.Under the same reaction time,the esterification rate increases with increasing the molar ratio of-COOH/-OH,the dosage of paratoluenesulfonic acid and the reaction temperature.The ratio of the component in poly（acrylic acid） grafted methoxyl polyethylene glycol copolymer（PAA-g-MPEG） was adjacent to the feeding ratio.The thermal decomposition of polyethylene glycol monomethoxyl ether monoacrylate（MPEGAA） is in the range of 320 ℃～450 ℃,and its maximum rate of the thermal decomposition appears at 417.5 ℃.The thermal decomposition of the branched chain and decarboxylation of the backbone in the PAA-g-MPEG occurs from 330 ℃ to 425 ℃ and from 425 ℃ to 460 ℃ respectively,and their maximum rate of the thermal decomposition appears at 393 ℃ and 440 ℃,respectively.
参考文献
| [1] | Ye YS;Huang HL;Hsu KC .A water-soluble acrylate/sulfonate copolymer. I. Its synthesis and dispersing ability on cement[J].Journal of Applied Polymer Science,2006(3):2490-2496. |
| [2] | Jean-Yves Petit;Eric Wirquin;Yannick Vanhove .Yield stress and viscosity equations for mortars and self-consolidating concrete[J].Cement and Concrete Research,2007(5):655-670. |
| [3] | Ran, Q.;Somasundaran, P.;Miao, C.;Liu, J.;Wu, S.;Shen, J. .Effect of the length of the side chains of comb-like copolymer dispersants on dispersion and rheological properties of concentrated cement suspensions[J].Journal of Colloid and Interface Science,2009(2):624-633. |
| [4] | Yu Bai;Wei-Ping Gao;Jing-Jing Yan .Co-aggregation process of poly(ethylene oxide)-b-polybutadiene/poly(acrylic acid) based on evolution of interpolymer hydrogen bonding in solutions[J].Polymer,2008(8):2099-2106. |
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