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

• Standard and Test • Previous Articles     Next Articles

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

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

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