发泡剂
材料科学
低密度聚乙烯
纳米复合材料
复合材料
发泡剂
热重分析
微观结构
纳米颗粒
聚丙烯
化学工程
聚乙烯
纳米技术
聚氨酯
多孔性
工程类
作者
Cristina Saiz‐Arroyo,Miguel Ángel Rodríguez‐Pérez,José Ignácio Velasco,J.A. de Saja
标识
DOI:10.1016/j.compositesb.2012.10.045
摘要
In this paper LDPE/silica nanocomposites are foamed by two different processes. First one is the pressure quench method which is based on the use of a physical blowing agent and second one is the improved compression moulding technique. As the latter process uses a chemical blowing agent, both types of foamed nanocomposites will provide very useful information about the relationship between foaming process-microstructure and macroscopic properties. Results have revealed how silica nanoparticles are able to act as nucleating sites during foaming step in both processes; however, the optimum amount of particles strongly depends on the foaming route. Thermal and mechanical properties of solid and foamed nanocomposites have been analyzed by means of thermogravimetric analysis and compression tests. Results have revealed that nanosilica particles act as effective nucleating agents, not only reducing cell size and increasing cell density but also achieving more homogeneous cellular structures. Thermal and mechanical properties are improved due to the presence of silica nanoparticles. It has been found that the improvement degree reached for samples produced using chemical blowing agents is greater than that achieved for samples produced using physical blowing agents.
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