Research Progress in Polyetherimide Foaming Technology

doi:10.19491/j.issn.1001-9278.2021.04.020

Abstract

Abstract:

This paper introduced the preparation technology of high-performance thermoplastic polymer foams ［polyetherimide （PEI） foams］， including batch solid-state foaming， extrusion foaming， injection molding foaming and other preparation technology. The effect of the selection of foaming agent and nucleating agent on the forming performance of PEI foams was discussed， and the research progress in the recent PEI domestic and foreign foaming technologies was summarized in detail. Finally， the development trend of PEI foams was prospected.

Key words: polyetherimide, foaming agent, nucleation agent, fabrication

CLC Number:

TQ 323.7

ZHANG Yihui, WANG Conglong, CHEN Shihong, WANG Xiangdong. Research Progress in Polyetherimide Foaming Technology[J]. China Plastics, 2021, 35(4): 124-132.

Figures/Tables 12

Fig.1. Structure of PEI

Fig.2. Batch solid?state foaming

Fig.3. Nano features in the cell wall

样品编号	总孔隙率/%	总热导率/K	微孔区域		纳孔区域
样品编号	总孔隙率/%	总热导率/K	孔隙率/ %	热导率/ K	孔隙率/ %	热导率/ K
1^#	31.15	0.073	38.1	0.070	-	-
2^#	39.38	0.057	50.0	0.050	-	-
4^#	61.67	0.026	50.0	0.050	74.0	0.019
5^#	66.19	0.024	54.5	0.049	77.2	0.016
6^#	70.91	0.020	57.1	0.045	79.0	0.015

Tab.1. Thermal conductivity values of micro? and nano?cellular regions

Fig.4. SEM of cross?section of the typical nanocellular PEI sample

Fig.5. Morphological parameters of PEEK/PEI foams foamed at 200 ℃

Fig.6. TEM of a cross?sectional area of the 40 % PEI and 60 %PEI film foamed at 200 ℃

Fig.7. Foam density of the PEI/silica foam samples with different die pressures and different nanosilica loading levels

Fig.8. Schematic of the injection molding system and foaming processing of PEI/PP

Fig.9. Fabrication process of the PEI/CNT composite foams with segregated structure

Fig.10. Snapshot of cubic box containing different molecules

Fig.11. Simulation model for the POSS/PEI nanocomposite

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