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首页> 外文学位 >Melt intercalation and/or exfoliation of polystyrene-montmorillonite nanocomposites.
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Melt intercalation and/or exfoliation of polystyrene-montmorillonite nanocomposites.

机译：聚苯乙烯-蒙脱土纳米复合材料的熔融插层和/或剥离。

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摘要

Thermal stability of organoclays and polystyrene (PS) intercalation in organoclays by melt processing were studied. The effects of polymer viscosity, processing conditions, type of mixing and the type of fillers on the intercalation process were evaluated. The resulting nanocomposites were tested to characterize structure, thermal stability and mechanical properties.;Two new organoclays were used in this study exhibited good thermal stability. This suggested their potential use in the preparation polymer nanocomposites at high processing temperatures.;Batch mixing promoted polymer intercalation in most cases. PS nanocomposites showed a combination of intercalated and unintercalated or collapsed structures. In general, thermal stability and mechanical properties of PS were enhanced by incorporation of organoclays. Processing conditions in the batch mixer had only a small influence on intercalation behavior. However, they had a strong effect on thermal stability and mechanical properties. The degree of intercalation was dependant on the type of organoclay. As a result thermal stability and mechanical properties were influenced by the type of organoclay used. The best mechanical properties were obtained with Cloisite 10-A.;Mixing in the twin screw extruder promoted intercalation of low viscosity PS. Thermal stability was increased in all cases, but mechanical properties did not improve significantly.;The tensile modulus of nanocomposites was calculated using five models reported in the literature. The results were compared to experimental data obtained in this study. Up to 1% wt Cloisite 10-A content, the experimental results showed very good agreement with the predictions of the Halpin-Tsai and Brune models, which predicted the highest modulus values. The experimental values fell rapidly bellow theoretical predictions above 1% wt clay content.
机译：研究了有机粘土的热稳定性和聚苯乙烯（PS）通过熔融加工插层的过程。评估了聚合物粘度，加工条件，混合类型和填料类型对插层过程的影响。对所得纳米复合材料进行了测试，以表征其结构，热稳定性和机械性能。这项研究中使用的两种新型有机粘土表现出良好的热稳定性。这表明它们在高加工温度下可用于制备聚合物纳米复合材料。在大多数情况下，分批混合促进了聚合物插层。 PS纳米复合材料显示了插层和非插层或塌陷结构的组合。通常，通过掺入有机粘土可提高PS的热稳定性和机械性能。间歇混合器中的加工条件对插层行为的影响很小。但是，它们对热稳定性和机械性能有很大影响。插入的程度取决于有机粘土的类型。结果，热稳定性和机械性能受到所用有机粘土类型的影响。使用Cloisite 10-A可获得最佳的机械性能；双螺杆挤出机中的混合促进了低粘度PS的插入。在所有情况下，热稳定性均得到提高，但机械性能并未显着改善。纳米复合材料的拉伸模量是使用文献报道的五个模型计算的。将结果与本研究中获得的实验数据进行比较。实验结果表明，Cloisite 10-A的含量最高为1％wt，与Halpin-Tsai和Brune模型的预测结果非常吻合，后者预测了最高的模量值。在高于1％wt粘土含量的理论预测下，实验值迅速下降。

著录项

  • 作者

    Uribe Calderon, Jorge Alonso.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Engineering Chemical.
  • 学位 M.Eng.
  • 年度 2003
  • 页码 116 p.
  • 总页数 116
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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