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首页> 外文期刊>Journal of Applied Polymer Science >Reprocessing Effects on Polypropylene/Silica Nanocomposites
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Reprocessing Effects on Polypropylene/Silica Nanocomposites

机译：对聚丙烯/二氧化硅纳米复合材料的后处理效果

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摘要

A polypropylene matrix was melt compounded with a given amount (2 vol %) of both untreated (hydrophilic) and surface treated (hydrophobic) fumed silica nanoparticles with the aim to investigate the influence of the time under processing conditions on the microstructure and thermo-mechanical properties of the resulting materials. Chain scission reactions induced by thermal processing caused a remarkable decrease of the melt viscosity, as revealed by the melt flow index values of both neat matrix and nanocomposites, but the degradative effect was significantly hindered by the presence of silica nanoparticles. It was observed that the size of nanofiller aggregates noticeably decreased as the compounding time increased, especially when hydrophobic silica nanofiller was considered. While the melting temperature seemed to be unaffected by the processing time, a remarkable embrittlement of the samples was observed for prolonged compounding times.
机译：将聚丙烯基质与给定量（2％体积）的未处理（亲水）和表面处理（疏水）气相二氧化硅纳米粒子熔融复合，以研究加工时间对显微组织和热机械性能的影响所得材料的性质。如通过纯基质和纳米复合材料的熔体流动指数值所揭示的，由热处理引起的断链反应引起熔体粘度的显着降低，但是降解效果由于二氧化硅纳米颗粒的存在而显着受到阻碍。观察到纳米填料聚集体的尺寸随着混合时间的增加而显着减小，特别是当考虑疏水性二氧化硅纳米填料时。虽然熔融温度似乎不受加工时间的影响，但观察到样品的明显脆化，延长了配混时间。

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