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Studies in polymer composites based on carbon containing pulverized rubber materials.

机译：基于含碳的粉碎橡胶材料的聚合物复合材料的研究。

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摘要

Pulverized rubber/thermoplastic IPNs (interpenetrating polymer networks) were synthesized using AIBN or BPO initiated polymerization in order to make high value-added materials from scrap tire. Catalytic polymerization in the presence of pulverized rubber using BPO as initiator was observed and found the catalytic activity was associated with the presence of carbon black in the rubber formulation.;A comprehensive kinetic study of catalytic polymerization of some vinyl acrylate monomers in the presence of pulverized rubber and carbon black was conducted. Overall, the kinetics was influenced by carbon content, carbon surface chemistry, reaction temperature, initiator concentration and type, dispersion of carbon, rubber formulation, etc. Catalytic mechanism of carbon black was proposed as carbon black nanoparticles were involved in the redox decomposition of BPO on their surfaces after it was adsorbed through pi-pi interaction. The unpaired pi electron on the basal plane of carbon black was suggested to be the main electron donor. Besides, it noted that the magnitude of the catalytic effect was higher in the presence of pulverized rubber than when carbon black was used. Experimental results revealed it was from the synergetic coupling between the catalytic effect of carbon and diffusional limitation effect.;A heterogeneous model considering the adsorption of BPO, redox and thermal decomposition and inhibition effect of carbon was developed and showed good predications with the experimental data at low carbon content while at high carbon content, the model prediction appears some deviation which would be the result of attaining maximum adsorption condition and/or possible re-agglomeration of carbon particles. Proper modification of the model is needed to describe these phenomena.;Carbon/PMMA nanocomposite and rubber/PMMA semi-IPNs were prepared by this catalytic polymerization and characterized DSC, TGA, SEM, three point bending flexural test and nanoindentation. The IPNs exhibited improved degree of phase compatibility and good mechanical properties at low rubber content. When rubber composition increased, modulus and hardness of the IPNs decreased but the elasticity increased. Besides, the IPNs made from smaller rubber particles were observed to have higher modulus and increased toughness. Finally, the pulverized rubber/PAA full-IPNs were prepared. The kinetics and swelling capacities of the IPNs were investigated.
机译：粉碎的橡胶/热塑性IPN（互穿聚合物网络）是使用AIBN或BPO引发的聚合反应合成的，目的是用废轮胎制造高附加值的材料。观察到以BPO为引发剂的粉状橡胶在催化下的聚合反应，发现橡胶配方中的催化活性与炭黑的存在有关。;粉状存在下一些丙烯酸乙烯基酯单体催化聚合的综合动力学研究进行橡胶和炭黑。总体而言，动力学受到碳含量，碳表面化学，反应温度，引发剂浓度和类型，碳的分散性，橡胶配方等的影响。提出了炭黑的催化机理，因为炭黑纳米颗粒参与了BPO的氧化还原分解。通过pi-pi相互作用被吸附后在其表面上碳黑基面上未成对的π电子被认为是主要的电子供体。此外，它指出，与使用炭黑时相比，在存在橡胶粉的情况下催化作用的强度更高。实验结果表明这是由于碳的催化作用与扩散限制作用之间的协同耦合所致。建立了一个考虑BPO吸附，氧化还原和热分解及碳抑制作用的非均质模型，并给出了很好的预测依据。低碳含量，而在高碳含量下，模型预测会出现一些偏差，这可能是获得最大吸附条件和/或碳颗粒可能重新团聚的结果。需要对模型进行适当的修改来描述这些现象。通过这种催化聚合反应制备了碳/ PMMA纳米复合材料和橡胶/ PMMA半IPN，并对其进行了DSC，TGA，SEM，三点弯曲挠曲测试和纳米压痕表征。 IPN在低橡胶含量下表现出改善的相相容性和良好的机械性能。当橡胶成分增加时，IPN的模量和硬度降低，但弹性增加。此外，观察到由较小橡胶颗粒制成的IPN具有更高的模量和更高的韧性。最后，制备了粉碎的橡胶/ PAA全IPN。研究了IPN的动力学和溶胀能力。

著录项

  • 作者

    Xiong, Ruohua.;

  • 作者单位

    Illinois Institute of Technology.;

  • 授予单位 Illinois Institute of Technology.;
  • 学科 Chemistry Polymer.;Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 244 p.
  • 总页数 244
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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