China Plastics ›› 2021, Vol. 35 ›› Issue (11): 64-70.DOI: 10.19491/j.issn.1001-9278.2021.11.010

• Materials and Properties • Previous Articles     Next Articles

Effect of Hygroscopic Behavior on Properties and Applications of PMI Foam

ZENG Zequn, WU Jinyu, XIANG Hui, LIU Weijie, YIN Jun()   

  1. Haobo(Fujian)New Materials Technology Co,Ltd,Jinjiang 362200,China
  • Received:2021-04-10 Online:2021-11-26 Published:2021-11-23

Abstract:

The effects of density, pore size and thickness of PMI foam on its hygroscopic behavior under different conditions were studied, and the effect of hygroscopicity on its mechanical properties, drying reversibility and adhesive performance were evaluated. The results indicated that an increase in the density of PMI foam led to a decrease in the rate of moisture absorption, whereas the pore size presented an opposite variation trend. The rise of thickness reduced not only the rate of moisture absorption but also the saturated moisture absorptivity. The PMI foam exhibits a decrease in rigidity and an increase in toughness after moisture absorption, which caused defects more easily during adhesion. In the short period of time for high humidity or immersion, the PMI foam shows reversible performance. After a long period of treatment, the performance of PMI foam decreased irreversibly.

Key words: polymethacrylimide, foam, moisture absorption, mechanical property, adhesion

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