应用化学 ›› 2024, Vol. 41 ›› Issue (8): 1126-1130.DOI: 10.19894/j.issn.1000-0518.240064

• 研究论文 • 上一篇    下一篇

对位芳纶中间位结构单元含量的定量分析

孙浩峻1,2, 衣小虎1, 程建华1,2, 苏朝晖1,2()   

  1. 1.中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春 130022
    2.中国科学技术大学,合肥 230026
  • 收稿日期:2024-04-18 接受日期:2024-06-20 出版日期:2024-08-01 发布日期:2024-08-27
  • 通讯作者: 苏朝晖
  • 基金资助:
    高分子物理与化学国家重点实验室开放基金项目资助

Quantitative Analysis of Meta-Aramid Units in Para-Aramids

Hao-Jun SUN1,2, Xiao-Hu YI1, Jian-Hua CHENG1,2, Zhao-Hui SU1,2()   

  1. 1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.University of Science and Technology of China,Hefei 230026,China
  • Received:2024-04-18 Accepted:2024-06-20 Published:2024-08-01 Online:2024-08-27
  • Contact: Zhao-Hui SU
  • About author:zhsu@ciac.ac.cn
  • Supported by:
    the State Key Laboratory of Polymer Physics and Chemistry

摘要:

在聚对苯二甲酰对苯二胺(PPTA)中引入间位结构可以调控其结晶和加工性能,因此确定其中的间位组分含量具有重要的实际意义。 本文将PPTA和间位芳纶(PMIA)共混,采集其红外光谱,发现位于689 cm-1处的间位取代苯环的C—H面内振动谱带强度与PMIA的含量呈现良好的线性正比关系,可以检测出共混样品中含有的质量分数2.0%的PMIA。 以拉曼光谱分析共混物,利用位于1002 cm-1的苯环呼吸振动谱带作为PMIA的特征峰,建立了峰强度与PMIA含量的标准曲线,具有良好的线性关系,能够检测出样品中低至质量分数0.25%的PMIA。 2种方法对比,拉曼光谱法具有更高的准确度和灵敏度,优于红外光谱法。

关键词: 芳纶, 定量分析, 拉曼光谱, 红外光谱

Abstract:

Introduction of meta-aramid units into poly(p-phenylene terephthalamide) (PPTA) allows regulation of its crystallization and processing properties, therefore, quantitation of the meta units in PPTA is of practical importance. In this paper, blends of PPTA with poly(m-phenylene isophthalamide) (PMIA) were prepared and analyzed by infrared and Raman spectroscopies. In the infrared spectra, it was found that the absorption band at 659 cm-1 attributed to C—H in-plane wagging vibration of the m-disubstituted benzene ring can be utilized for quantitative analysis of PMIA, the intensity of which exhibited good linear relationship with PMIA content, allowing detection of meta units of 2.0%(mass percent) and above. In the Raman spectra of the blends, the breathing vibration of the meta-disubstituted benzene ring at 1002 cm-1 characteristic of PMIA was found to exhibit an intensity proportional to its content with excellent linear correlation, which enabled detection of meta units of a low content of 0.25%(mass percent). In conclusion, the Raman method is more accurate with a lower detection limit, and therefore is superior to the IR method for quantitation of meta units in para-aramids.

Key words: Aramids, Quantitation, Raman spectroscopy, Infrared spectroscopy

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