Reactive extrusion processing of polypropylene/SiO2 nanocomposites by in situ synthesis of the nanofillers: Experiments and properties
Reactive extrusion processing of polypropylene/SiO2 nanocomposites by in situ synthesis of the nanofillers: Experiments and properties
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DOI：
10.1016/j.polymer.2014.08.059
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发表时间：
2014-10
期刊：
影响因子：
4.6
通讯作者：
E. Kluenker;J. Faymonville;K. Peter;M. Moeller;C. Hopmann
中科院分区：
文献类型：
--
作者：
E. Kluenker;J. Faymonville;K. Peter;M. Moeller;C. Hopmann
基于无溶剂二氧化硅前驱体聚合物超支化聚烷氧基硅氧烷（PAOS）的聚丙烯（PP）/二氧化硅纳米复合材料的实验室规模开发的原位溶胶-凝胶间歇工艺的概念已被转移到工业上可应用的连续挤出工艺。为了实现在PP熔体中连续原位合成纳米填料的合适的工艺设置，改变工艺参数。确定了工艺参数对前体转化率、形成的二氧化硅颗粒的尺寸和分布以及所得PP纳米复合材料的机械性能的影响。此外，这些材料相比，传统的二氧化硅复合材料的基础上熔融混合过程。发现在给定的工艺设置下，使用12.5%改性度的十六烷基改性的PAOS（C16（12.5%）-PAOS）可以实现PAOS向二氧化硅颗粒的转化率大于90%。与二氧化硅粉末的应用相比，在所得复合材料中产生了分布良好的小二氧化硅颗粒而没有任何附聚。
The concept of a lab-scale developed in situ sol–gel batch process for fabrication of polypropylene (PP)/silica nanocomposites based on a solvent-free silica precursor polymer, a hyperbranched polyalkoxysiloxane (PAOS), has been transferred to a continuous industrially applicable extrusion process. To achieve a suitable process set-up for the continuous in situ synthesis of nanofillers in the PP melt, process parameters are varied. The influence of process parameters on precursor conversion, size and distribution of the formed silica particles and the mechanical properties of the resulting PP nanocomposites is determined. In addition, these materials are compared to conventional silica composites based on melt mixing process. It was found, that a PAOS conversion to silica particles of more than 90% could be realised using a hexadecyl-modified PAOS of 12.5% degree of modification (C16(12.5%)-PAOS) at the given process set-up. Well distributed, small silica particles without any agglomeration were yield in the resulting composites in comparison to application of silica powder.