China Plastics ›› 2021, Vol. 35 ›› Issue (11): 49-54.DOI: 10.19491/j.issn.1001-9278.2021.11.008

• Materials and Properties • Previous Articles     Next Articles

Effect of Red Mud on Thermal, Mechanical Property and Foaming Behavior of PLA

LIU Wei(), WU Xian, ZHANG Chun()   

  1. School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China
  • Received:2021-04-01 Online:2021-11-26 Published:2021-11-23

Abstract:

Poly(lactic acid) (PLA)/red mud (RM) composites were prepared by melt?mixing method, and their crystallization, mechanical and foaming behaviors were investigated. The results indicated that RM improved the crystallization of PLA, resulting in an increase in crystallinity from 5.34 wt % to 13.89 wt %. The PLA/RM composites were foamed using a solid?state foaming method with supercritical CO2 as a blowing agent. The foaming behavior showed that the cellular parameters could be controlled by the RM content. With the addition of 5 wt % RM, the cellular density and expansion ratio of the composites decreased down to 1.82×107 cell/cm3 and 2.25 times, respectively. However, the cellular density and expansion ratio increased up to 12.46×107 and 12.40 fold with the addition of MDI. A combination of RM and MDI could improve the foaming behavior and mechanical property of PLA foams.

Key words: poly (lactic acid), red mud, foam, composite

CLC Number: