Study on Polyetherimide Foaming Behavior under Homogeneous Nucleation

doi:10.19491/j.issn.1001-9278.2021.05.011

Abstract

Abstract:

Polyetherimide （PEI） foams were prepared by a batch foaming method using supercritical CO₂ as a foaming agent. The effects of foaming temperature， foaming pressure， and foaming time on the foaming behavior of PEI were explored under the homogeneous nucleation condition. The PEI microcellular foam materials with a composite foaming structure were preparing by a two?step depressurization batch foaming technology. The results indicated that the foaming rate of PEI microcellular foams was improved by the composite foaming structure. The first pressure drop and the second holding time were consi?dered as two key factors that influenced the cell structure.

Key words: polyetherimide, foaming, homogeneous nucleation, supercritical carbon dioxide, composite bubble structure

CLC Number:

TQ323.7

ZHANG Yihui, CHEN Shihong, WANG Conglong, WANG Xiangdong. Study on Polyetherimide Foaming Behavior under Homogeneous Nucleation[J]. China Plastics, 2021, 35(5): 65-71.

Figures/Tables 15

References 18

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样品编号	发泡温度/℃	发泡压力/MPa	浸泡时间/h
1^#	220	20	2
2^#	230	20	2
3^#	240	20	2
4^#	250	20	2
5^#	240	8	3
6^#	240	12	3
7^#	240	16	3
8^#	240	20	3
9^#	240	20	1

样品编号	发泡温度/℃	发泡压力/MPa	浸泡时间/h
1^#	220	20	2
2^#	230	20	2
3^#	240	20	2
4^#	250	20	2
5^#	240	8	3
6^#	240	12	3
7^#	240	16	3
8^#	240	20	3
9^#	240	20	1

样品编号	第一次压力降ΔP₁/MPa	第二次保压时间Δt₂/min
10^#	1.0	60
11^#	2.5	60
12^#	5.0	60
13^#	7.5	60

样品编号	第一次压力降ΔP₁/MPa	第二次保压时间Δt₂/min
10^#	1.0	60
11^#	2.5	60
12^#	5.0	60
13^#	7.5	60

样品编号	第一次压力降ΔP₁/MPa	第二次保压时间Δt₂/min
14^#	5	10
15^#	5	60
16^#	5	90