中国塑料 ›› 2023, Vol. 37 ›› Issue (12): 41-46.DOI: 10.19491/j.issn.1001-9278.2023.12.007

• 材料与性能 • 上一篇    下一篇

PA66扩链改性及其超临界CO2微孔发泡行为研究

孙乙博, 刘亚宁, 芦浩凡, 陈士宏, 王向东(), 武丽丽()   

  1. 北京工商大学轻工科学与工程学院,北京 100048
  • 收稿日期:2023-10-14 出版日期:2023-12-26 发布日期:2023-12-26
  • 通讯作者: 王向东(1972-),男,教授,博士研究生导师,主要从事聚合物发泡材料的研究开发,wangxid@th.btbu.edu.cn
    武丽丽,女,北京工商大学轻工科学与工程学院,主要从事聚合物改性加工的研究,wulll@th.btbu.edu.cn
    E-mail:wangxid@th.btbu.edu.cn;wulll@th.btbu.edu.cn

Study on chain⁃extending reaction of PA66 and its supercritical CO2 microcellular foaming behavior

SUN Yibo, LIU Yaning, LU Haofan, CHEN Shihong, WANG Xiangdong(), WU Lili()   

  1. School of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China
  • Received:2023-10-14 Online:2023-12-26 Published:2023-12-26
  • Contact: WANG Xiangdong, WU Lili E-mail:wangxid@th.btbu.edu.cn;wulll@th.btbu.edu.cn

摘要:

用多官能环氧基扩链剂CE与抗氧剂B215对线形聚酰胺66(PA66)熔融扩链改性,并采用釜压发泡的方法,以超临界CO2为发泡剂制备了一系列不同的微孔CEPA66泡沫。通过差示扫描量热仪、傅里叶变换红外光谱仪、旋转流变仪等表征了样品结晶、储能模量、复数黏度等的变化。结果表明,扩链剂CE的引入形成了支化PA66,CE有效地提高了PA66的熔体强度;优选了CE的添加量获得了高支化、低交联的PA66,并成功制得了PA66微孔泡沫;当CE添加量为4.0份、饱和温度为275 ℃时,样品泡孔尺寸为23 μm、泡孔密度为3.5×109个/cm3

关键词: 聚酰胺66, 环氧扩链剂, 微孔泡沫, 发泡, 超临界二氧化碳

Abstract:

A multifunctional epoxy chain extender CE and an antioxidant B215 were used to modify linear polyamide 66 (PA66) through melting chain extension, and a series of microporous CEPA66 foams were prepared by supercritical CO2. The branched PA66 was formed by the introduction of the chain extender CE, and its crystallization behavior, energy⁃storage modulus, and complex viscosity were characterized by using DSC, FTIR and rotary rheometer. The use of CE effectively improved the melt strength of PA66, and its addition amount was optimized to obtain PA66 with a high branching and low crosslinking degrees. The PA66 microcellular foams were successfully obtained at a saturation temperature of 275 ℃. Their cell size and cell density are 23 μm and 3.5×109 cells /cm3, respectively.

Key words: polyamide 66, epoxy chain extender, microcellular foam, foaming, supercritical carbon dioxide

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