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Grafting thermosensitive PNIPAM onto the surface of carbon spheres

机译：将热敏PNIPAM接枝到碳球表面上

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摘要

Thermosensitive polymer poly(N-isopropylacrylamine) (PNIPAM) grafted-carbon spheres (CSs) composites were synthesized and investigate the influence of synthesis parameters on phase transition temperature in order to produce thermosensitive composites with different phase transition temperatures, which may be applied to different application fields. First, vinyl groups were introduced onto the surface of CSs by mixed acid oxidation and reacting with 3-methacryloxypropyl trimethoxysilane. Then, PNIPAM was grafted onto the surface of CSs by surface free-radical polymerization. According to the differential scanning calorimetric analysis, the PNIPAM-grafted CSs composites are temperature responsive. The weight ratio of monomer to CSs and the initiator dosage had great influence on the polymer shell thickness and the lower critical solution temperature (LCST) of the composites determined by the number of grafted polymer chain, chain length and the cross-link degree. The polymer shell thickness and the LCST of the composites increased with the increase of the amount of monomer in proper range, however, first increase and then decrease with the increasing initiator dosage. The cross-linking agent content affects critically the cross-link degree, and then the LCST. Therefore, the LCST of the PNIPAM-grafted CSs composites was adjustable by changing the synthesis parameters, which lays the basis for CSs application in different fields.
机译：合成了热敏性高分子聚（N-异丙基丙烯胺）（PNIPAM）接枝碳球（CSs）复合材料，研究了合成参数对相变温度的影响，以制备具有不同相变温度的热敏复合材料，可应用于不同的相变温度。应用领域。首先，将乙烯基通过混合酸氧化并与3-甲基丙烯酰氧基丙基三甲氧基硅烷反应而引入到CS的表面。然后，通过表面自由基聚合将PNIPAM接枝到CS的表面上。根据差示扫描量热分析，PNIPAM接枝的CSs复合材料具有温度响应性。单体与CSs的重量比和引发剂用量对聚合物壳的厚度和由接枝聚合物链的数目，链长和交联度决定的复合材料的较低临界溶液温度（LCST）有很大影响。在适当范围内，随着单体用量的增加，复合材料的聚合物壳厚度和LCST均增加，但是，随着引发剂用量的增加，其先增加后降低。交联剂的含量会严重影响交联度，进而影响LCST。因此，通过改变合成参数可以调节PNIPAM接枝CS复合材料的LCST，为CS在不同领域的应用奠定了基础。

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  • 来源
    《Applied Surface Science》 |2014年第1期|116-125|共10页
  • 作者

    Xingmei Guo; Zefeng Du; Maoning Song; Li Qiu; Yinghua Shen; Yongzhen Yang; Xuguang Liu;

  • 作者单位

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

    Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, China, Research Center on Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China;

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China, Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, China;

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  • 正文语种 eng
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  • 关键词

    Carbon spheres; Poly(N-isopropylacrylamide); Thermo-responsive; Composites; Lower critical solution temperature;

    机译：碳球;聚（N-异丙基丙烯酰胺）;热响应;复合材料;降低临界溶液温度;

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