Study on Foaming Behavior of PES Using Supercritical CO2 as Foaming Agent

doi:10.19491/j.issn.1001-9278.2021.06.003

Abstract

Abstract:

Polyether sulfone （PES） foams were prepared through a batch?foaming method using supercritical CO₂ as a foaming agent， and their homogeneous nucleation behavior during the foaming process was investigated with talc and SiO₂ as heterogeneous nucleating agents. The results indicated that the foaming parameters were determined to be a temperature of 200~230 °C， an optimal immersion pressure of 20 MPa， and an optimum soaking time of 3 h for the intermittent foaming method. The pore diameter of unmodified PES foams was less than 10 μm， and their pore density was 10⁹~10¹⁰ /cm³ with a thicker pore wall. SiO₂ was found to show a more obvious heterogeneous nucleation effect than Talc. Under the foaming conditions of 210 °C， 3 h， 20 MPa， PES foams achieved a diameter of 0.77 μm and a cell density of 4.16×10¹¹cells /cm³ in the presence of 0.9 wt% SiO₂.

Key words: polyether sulfone, foam, homogeneous nucleation, heterogeneous nucleation, talc, silicon dioxide, microporous structure

CLC Number:

TQ 326.55

WANG Conglong, HAN Shuo, ZHANG Yihui, CHEN Shihong, WANG Xiangdong. Study on Foaming Behavior of PES Using Supercritical CO₂ as Foaming Agent[J]. China Plastics, 2021, 35(6): 13-19.

Figures/Tables 12

Fig.1. Schematic diagram of batch foaming device

Fig.2. SEM of PES foams

Fig.3. Effect of saturation temperature on microstructure of PES foams

Fig.4. SEM of PES foams

Fig.5. Effect of saturation time on the cell density of PES foams

Fig.6. Effect of talc content on dynamic rheological properties of PES

Fig.7. Effect of saturation temperature on PES foams with different talc content

Fig.8. SEM of PES foam with different talc content

滑石粉含量/%	温度/℃
滑石粉含量/%	200	210	220	230
0	1.13	1.48	1.68	2.02
0.3	1.08	1.51	1.61	1.91
0.6	1.10	1.50	1.61	1.87
0.9	1.14	1.46	1.66	1.95
1.2	1.10	1.36	2.14	1.77
1.5	1.13	1.44	1.85	2.08

Tab.1. Volume expansion ratio of PES foams with different talc content

Fig.9. Dynamic rheological curves of PES foams with different SiO2 content

Fig.10. Effect of temperature on PES foams with different SiO2 content

Fig.11. SEM of PES foams with different SiO2 content

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Study on Foaming Behavior of PES Using Supercritical CO₂ as Foaming Agent

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