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Synthesis of block cationic polyacrylamide precursors using an aqueous RAFT dispersion polymerization

机译：使用筏水分散聚合的嵌段阳离子聚丙烯酰胺前体的合成

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摘要

Synthesis of cationic polyacrylamides (CPAMs) by introducing cationic polymer precursors followed by chain extension of acrylamide (AM) homopolymer blocks via RAFT polymerization is a promising approach for engineering high-performance CPAMs. However, the aqueous solution polymerization of AM usually leads to high viscosity, thus limiting the solid content in the polymerization system. Herein a novel approach is introduced that uses a random copolymer of AM and methacryloxyethyltrimethyl ammonium chloride (DMC) as a macro RAFT chain transfer agent (mCTA) and stabilizer for aqueous RAFT dispersion polymerization of AM. The AM/DMC random copolymers synthesized by RAFT solution polymerization, having narrow dispersities (D-s) at different molecular weights and cationic degrees (C-s), could serve as the mCTA, which was confirmed by mCTA chain extension in aqueous solution polymerization of AM under different C-s, solid contents, AM addition contents, extended PAM block lengths, and mCTA chain lengths. The block CPAMs had a D value of less than 1.2. A model was developed using the method of moments with consideration of the diffusion control effect, for further understanding the chain extension kinetics. Predicted polymerization kinetics provided an accurate fit of the experimental data. The AM/DMC random copolymers were further used for aqueous RAFT dispersion polymerization of AM under different polymerization temperatures, C-s, and mCTA chain lengths. The resulting products had a milky appearance, and the block copolymers had D-s of less than 1.3. Higher C-s and longer chain lengths on mCTAs were beneficial for stabilizing the polymerization systems and produced smaller particle sizes and less particle aggregation. The products remained stable at room temperature storage for more than a month. The results indicate that aqueous RAFT dispersion polymerization using random copolymers of AM and DMC at moderate cationic degrees as a stabilizer and mCTA is a suitable approach for synthesizing CPAM block precursors at an elevated solid content.
机译：通过引入阳离子聚合物前体的合成阳离子聚丙烯酰胺（CPAM），然后通过RAFT聚合引入丙烯酰胺（AM）均聚物嵌段的链延伸是工程高性能CPAM的有希望的方法。然而，Am的水溶液聚合通常导致高粘度，从而限制聚合体系中的固体含量。在此引入一种新方法，其使用AM和甲基丙烯酰甲基三甲基氯化铵（DMC）作为宏筏链转移剂（MCTA）和稳定剂的AM的宏观分散剂稳定剂。由筏溶液聚合合成的AM / DMC随机共聚物，在不同分子量和阳离子度（CS），可以用作MCTA，其通过MCTA链延伸在不同的水溶液聚合中的MCTA链延伸证实CS，固体内容，AM加法内容，扩展PAM块长度和MCTA链长度。块CPAM的D值小于1.2。利用考虑扩散控制效果的矩的方法开发了一种模型，用于进一步了解链延伸动力学。预测聚合动力学提供了实验数据的准确拟合。 AM / DMC随机共聚物进一步用于在不同的聚合温度，C-S和MCTA链长下的含水筏水分散体聚合。所得产物具有乳状外观，嵌段共聚物的D-S小于1.3。 MCTA上的C-S和较长链长度有利于稳定聚合体系并产生较小的颗粒尺寸和少于颗粒聚集体。产品在室温储存稳定稳定，超过一个月。结果表明，使用AM和DMC随机共聚物作为稳定剂和MCTA的随机共聚物的水筏分散聚合是一种合适的方法，用于在升高的固体含量下合成CPAM嵌段前体。

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  • 来源
    《RSC Advances》 |2019年第22期|共14页
  • 作者

    Huang Bo; Jiang Jie; Kang Mutian; Liu Pingwei; Sun Hailong; Li Bo-Geng; Wang Wen-Jun;

  • 作者单位

    Zhejiang Univ Coll Chem &

    Biol Engn State Key Lab Chem Engn 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Coll Chem &

    Biol Engn State Key Lab Chem Engn 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Coll Chem &

    Biol Engn State Key Lab Chem Engn 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Coll Chem &

    Biol Engn State Key Lab Chem Engn 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

    Sichuan Univ State Key Lab Hydraul &

    Mt River Engn 24 South Sect 1 Yihuan Rd Chengdu 610064 Sichuan Peoples R China;

    Zhejiang Univ Coll Chem &

    Biol Engn State Key Lab Chem Engn 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Coll Chem &

    Biol Engn State Key Lab Chem Engn 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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