中国塑料 ›› 2021, Vol. 35 ›› Issue (8): 181-188.DOI: 10.19491/j.issn.1001-9278.2021.08.025

• 标准与测试 • 上一篇    下一篇

核磁法定量分析生物降解塑料中聚乳酸等组分

陈新启1, 白云1, 刘珊珊1, 高峡1, 刘伟丽1, 张梅1(), 吴毓炜2, 黄艳2, 赵宏亮2()   

  1. 1.北京市理化分析测试中心,有机材料检测技术与质量评价北京市重点实验室,北京 100089
    2.海南省产品质量监督检验所,海口 570203
  • 收稿日期:2021-05-06 出版日期:2021-08-26 发布日期:2021-08-27
  • 基金资助:
    国家市场监督管理总局保障性专项项目(2019YJ036);北京市改革与发展专项(2021ZL0118)

Determination of Polylactic Acid and Other Components in Biodegradable Plastics Using Quantitative 1H⁃NMR Method

CHEN Xinqi1, BAI Yun1, LIU Shanshan1, GAO Xia1, LIU Weili1, ZHANG Mei1(), WU Yuwei2, HUANG Yan2, ZHAO Hongliang2()   

  1. 1.Beijing Key Laboratory of Detection Technology and Quality Evaluation of Organic Material,Beijing Centre for Physical and Chemical Analysis,Beijing 100089,China
    2.Hainan Products Quality Supervision & Testing Institute,Haikou 570203,China
  • Received:2021-05-06 Online:2021-08-26 Published:2021-08-27
  • Contact: ZHANG Mei,ZHAO Hongliang E-mail:zhangmei@bcpca.ac.cn;hnxxzhao@126.com

摘要:

采用核磁共振氢谱法,以1,2,4,5?四氯苯为内标,建立了生物降解塑料中聚乳酸(PLA)、聚丁二酸丁二酯(PBS)和聚对苯二甲酸?己二酸?丁二酯(PBAT)3种组分的定量分析方法。该方法明确了PLA、PBS和PBAT的定量特征峰,建立了定量计算公式。同时测定了7批市售生物降解购物袋中上述3种组分的含量。结果表明,在内标物与目标物定量特征峰面积比1∶5~5∶1范围内,该方法表现出良好的线性关系,相关系数(R)均>0.99,3种组分精密度、重复性的相对标准偏差均≤3 %,定量分析结果相对误差绝对值均≤3.0 %,该方法准确且简便可行;该方法适用于生降解塑料样品中PLA、PBS、PBAT含量的快速测定。

关键词: 生物降解, 核磁共振氢谱, 内标法, 定量核磁

Abstract:

The contents of polylactic acid (PLA), poly(butylene succinate) (PBS) and poly(butylene adipate terephthalate) (PBAT) were detected by hydrogen nuclear magnetic resonance spectroscopy (1H?NMR) with 1,2,4,5?tetrachlorobenzene as the internal standard. The method identified the characteristic peaks of PLA, PBS and PBAT for quantitative analysis and established their quantitative calculation formulas. The results indicated that good linear relationships (R>0.99) were achieved among the characteristic peak area ratios of 1∶5~5∶1 for the internal standard substance and target substance. The relative standard deviations of the precision and repeatability of the three components were all lower than 3 %. The results indicated that this method was accurate, simple and feasible to detect the contents of PLA, PBS and PBAT. In addition, the contents of PLA, PBS and PBAT in 7 batches of commercial biodegradable shopping bags were determined, and the results demonstrated that the method was suitable for rapid determination of the contents of PLA, PBS, and PBAT in the biodegradable samples.

Key words: biodegradation, 1H?nuclear magnetic resonance, internal standard method, quantitative nuclear magnetic resonance

中图分类号: