核磁法定量分析生物降解塑料中聚乳酸等组分  

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

作　　者：陈新启 白云 刘珊珊 高峡[1] 刘伟丽[1] 张梅[1] 吴毓炜 黄艳[2] 赵宏亮[2] CHEN Xinqi;BAI Yun;LIU Shanshan;GAO Xia;LIU Weili;ZHANG Mei;WU Yuwei;HUANG Yan;ZHAO Hongliang(Beijing Key Laboratory of Detection Technology and Quality Evaluation of Organic Material,Beijing Centre for Physical and Chemical Analysis,Beijing 100089,China;Hainan Products Quality Supervision&Testing Institute,Haikou 570203,China)

机构地区：[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

出　　处：《中国塑料》2021年第8期181-188,共8页China Plastics

基　　金：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)。

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。The contents of polylactic acid(PLA),poly(butylene succinate)(PBS)and poly(butylene adipate terephthal‐ate)(PBAT)were detected by hydrogen nuclear magnetic resonance spectroscopy(^(1)H‐NMR)with 1,2,4,5‐tetrachlo‐robenzene as the internal standard.The method identified the characteristic peaks of PLA,PBS and PBAT for quantita‐tive 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 low‐er 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.

关 键 词：生物降解 核磁共振氢谱 内标法 定量核磁 

分 类 号：TQ321[化学工程—合成树脂塑料工业]