Study on the activity difference of macromonomers for preparing polycarboxylic superplasticizers,Journal of Applied Polymer Science

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Study on the activity difference of macromonomers for preparing polycarboxylic superplasticizers
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2019-12-19 , DOI: 10.1002/app.48844
Guanjie Liu _{1,

2} , Xuehong Wei ₁ , Ziwei Wang ₂ , Jianguo Ren _{1,

2}

Affiliation

Polycarboxylic superplasticizers produced by polyether macromonomers have attracted widely attention recently. Polyether macromonomers can be divided into vinyl ether‐based and vinyl alcohol‐based macromonomers according to the starting agents (vinyl ether and vinyl alcohol, respectively). In this study, three vinyl ether‐based macromonomers were synthesized to compare with vinyl alcohol‐based macromonomers that commonly used at present. It was found that the three vinyl ether‐based macromonomers all can be copolymerized at lower reaction temperature (5 °C) and shorter reaction time (30–45 min) when the same reaction conversion ratio was achieved. To better explain the high activity of vinyl ether‐based macromonomers, the molecular structure of different polyether macromonomers was calculated. The results show that the electron cloud on the CC double bond of vinyl ether‐based macromonomers exhibits more obvious deflection because of the direct connection with the oxygen atom, which makes it more easily to copolymerize with acrylic acid. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48844.

中文翻译：

大分子单体制备聚羧酸高效减水剂活性差异的研究

由聚醚大分子单体生产的聚羧酸类高效减水剂最近引起了广泛的关注。根据起始剂（分别为乙烯基醚和乙烯醇），聚醚大分子单体可分为基于乙烯基醚的大分子单体和基于乙烯基醇的大分子单体。在本研究中，合成了三种基于乙烯基醚的大分子单体，以与目前常用的基于乙烯基醇的大分子单体进行比较。发现当达到相同的反应转化率时，三种基于乙烯基醚的大分子单体都可以在较低的反应温度（5°C）和较短的反应时间（30-45分钟）下共聚。为了更好地说明基于乙烯基醚的大分子单体的高活性，计算了不同聚醚大分子单体的分子结构。结果表明，乙烯基醚基大分子单体在CC双键上的电子云由于与氧原子直接连接而表现出更明显的偏转，从而使其更易于与丙烯酸共聚。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2020，137，48844。

更新日期：2020-03-27

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