4.7 Article

Rheological/crystallization behavior of PP/graphite nanosheet composites and performance of microcellular foaming plastics

期刊

COMPOSITES COMMUNICATIONS
卷 32, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2022.101133

关键词

PP; Graphite composite; Mold-opening foam injection molding; Crystallization behavior; Cellular structure; Mechanical properties

资金

  1. National Natural Science Foundation of China [51975329, 51675307]
  2. key research and development program of Shandong Province [2021ZLGX01]

向作者/读者索取更多资源

This study reports a promising method to prepare lightweight and strong PP/graphite nanosheet (GN) nanocomposite foaming products. By adding GN, the crystallization behavior and rheological behavior of PP are improved, and excellent cellular structure is achieved using mold-opening foaming injection molding technology. PP/GN nanocomposite foam exhibits high tensile strength, modulus, and impact strength.
The large, uneven and distorted cells in foaming products seriously weakens its mechanical properties. Herein, a promising way to prepare lightweight and strong PP/graphite nanosheet(GN) nanocomposite foaming products is reported. To improve foaming performance, the effects of GN on the crystallization behavior and rheological behavior of PP are firstly systematically studied. It is found that the addition of GN not only directly improves the melt strength and viscoelasticity, but also has the dual effects of refining grain size and accelerating crystallization process. The excellent cellular structure with the average cell diameters of several microns is fabricated using m old-opening foaming injection molding (MOFIM) process, which contributes to enhanced mechanical properties. The tensile strength and modulus of PP/GN nanocomposite foams with opening distance of 1 mm is almost 50% and 70% higher than that of the neat PP solids, respectively. The nanocomposite foam also shows superior impact strength, increased to above 75% than that of the neat PP solids.

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