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Investigation of RAFT polymerization in mesoporous SBA-15 by using various monomers

机译：用各种单体研究介孔SBA-15中筏聚合的研究

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摘要

Reversible addition fragmentation transfer (RAFT) polymerization has attracted much attention, because its reaction mechanism has been well studied and it provides a facile approach to prepare the special functional polymer. Herein, mesoporous SBA-15 with pore size of 6 nm was employed as a "microreactor" for the RAFT solution polymerization of methyl methacrylate (MMA), glycidyl methacrylate (GMA) or styrene (St) using a xanthate as a chain transfer agent and AIBN as the initiator. The structures, morphologies and properties of the obtained polymers and in-situ composites were fully characterized. XPS results confirm the presence of sulfur in the obtained polymers, which indicates a RAFT polymerization mechanism. XRD observation found that the in-situ composites exhibited the similar two-dimensional hexagonal pore structures intrinsic to SBA-15. However, the specific surface area, pore size, and pore volumes of the composites decreased dramatically compared with the intrinsic SBA-15 morphology. N(2)adsorption studies of polymers synthesized from various monomer mixtures revealed differing properties with adsorption capacity in the order of GMA MMA St. TheM(n)andM(w)of polymers produced from within SBA-15 were significantly higher than those produced external to the SBA-15 framework. Meanwhile, the molecular weight distributions of polymers constructed within the SBA-15 were narrower. Lastly, the thermal stability and glass transition temperature of the polymers constructed within the SBA-15 were notably enhanced.
机译：可逆添加碎片转移（筏）聚合引起了很多关注，因为其反应机理已经很好地研究，并提供了制备特殊功能性聚合物的容易方法。在此，使用孔径为6nm的介孔SBA-15作为使用黄原酸甲酯作为链转移剂的甲基丙烯酸甲酯（MMA），甲基丙烯酸缩水甘油酯（GMA）或苯乙烯（ST）的“微反应器”。 aibn作为发起者。得到了所得聚合物和原位复合材料的结构，形态和性质。 XPS结果证实了所得聚合物中硫的存在，表示筏聚合机制。 XRD观察发现原位复合材料表现出类似于SBA-15的类似二维六边形孔结构。然而，与本征SBA-15形态相比，复合材料的比表面积，孔径和孔体积显着降低。 N（2）由各种单体混合物合成的聚合物的吸附研究揭示了从SBA-15内产生的GMA> ST的吸附容量的吸附容量不同的性质显着高于那些含量的聚合物（N）andm（w）在SBA-15框架外部产生。同时，在SBA-15内构建的聚合物的分子量分布较窄。最后，显着提高了在SBA-15内构建的聚合物的热稳定性和玻璃化转变温度。

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  • 来源
    《Journal of porous materials》 |2020年第3期|659-669|共11页
  • 作者

    Zeng Yanning; Liu Shuxin; Xu Yunqing; Zhang Faai;

  • 作者单位

    Guilin Univ Technol Coll Mat Sci & Engn Minist Educ Key Lab New Proc Technol Nonferrous Met & Mat 12 Jiangan Rd Guilin 541004 Peoples R China;

    Guilin Univ Technol Coll Mat Sci & Engn Minist Educ Key Lab New Proc Technol Nonferrous Met & Mat 12 Jiangan Rd Guilin 541004 Peoples R China;

    Guilin Univ Technol Coll Mat Sci & Engn Minist Educ Key Lab New Proc Technol Nonferrous Met & Mat 12 Jiangan Rd Guilin 541004 Peoples R China;

    Guilin Univ Technol Coll Mat Sci & Engn Minist Educ Key Lab New Proc Technol Nonferrous Met & Mat 12 Jiangan Rd Guilin 541004 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mesoporous SBA-15; RAFT; Confined space; Monomers;

    机译：中孔SBA-15;筏;限制空间;单体;

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