中国塑料 ›› 2021, Vol. 35 ›› Issue (6): 13-19.DOI: 10.19491/j.issn.1001-9278.2021.06.003

• 材料与性能 • 上一篇    下一篇

聚醚砜超临界CO2发泡行为研究

王从龙, 韩硕, 张一辉, 陈士宏(), 王向东()   

  1. 北京工商大学化学与材料工程学院,北京 100048
  • 收稿日期:2021-01-22 出版日期:2021-06-26 发布日期:2021-06-23

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

WANG Conglong, HAN Shuo, ZHANG Yihui, CHEN Shihong(), WANG Xiangdong()   

  1. College of Chemistry and Materials Engineering,Beijing Technology and Business University,Beijing 100048,China
  • Received:2021-01-22 Online:2021-06-26 Published:2021-06-23
  • Contact: CHEN Shihong,WANG Xiangdong E-mail:shihong02@126.com;wangxiangdong@th.btbu.edu.cn

摘要:

以超临界CO2为发泡剂,采用间歇发泡法制备了聚醚砜(PES)泡沫。采用旋转流变仪和扫描电子显微镜分析表征了PES发泡的均相成核行为,继而分别以滑石粉和二氧化硅(SiO2)作为异相成核剂,探究了PES发泡过程中的异相成核行为。结果表明,间歇发泡法制备PES泡沫的发泡区间为200~230 ℃;最佳浸泡压力为20 MPa;最佳浸泡时间为3 h;未改性PES的泡孔直径均可在10 μm以下,泡孔密度在109~1010 个/cm3之间,但泡孔壁较厚;SiO2相对于Talc,表现出更显著的异相成核作用;在210 ℃、3 h、20 MPa的发泡条件下,添加0.9 %(质量分数,下同)的SiO2,可得到泡孔直径为0.77 μm,泡孔密度为7.14×1011 个/cm3的PES微孔泡沫。

关键词: 聚醚砜, 泡沫, 均相成核, 异相成核, 滑石粉, 二氧化硅, 微孔

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 4.16×1011 cells /cm3 in the presence of 0.9 wt% SiO2.

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

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