基于FTIR光谱技术对可生物降解材料中添加PE/EVA组分的定性定量分析  

Research on Qualitative and Quantitative Analysis of PE and EVA in Biodegradable Materials by FTIR

作　　者：尚超男 谢艳丽[2] 高峡[3] 周雪晴[2] 赵振东[2] 马佳鑫 崔芃 魏晓晓[3] 冯玉红[1,2] 张名楠[2] SHANG Chao-nan;XIE Yan-li;GAO Xiao;ZHOU Xue-qing;ZHAO Zhen-dong;MA Jia-xin;CUI Peng;WEI Xiao-xiao;FENG Yu-hong;ZHANG Ming-nan(College of Chemical Engineering and Technology,Hainan University,Haikou 570228,China;Analysis and Test Center of Hainan University,Haikou Municipal Key Laboratories of Analysis and Test for Neo-drug Research&Development,Haikou 570228,China;Institute of Analysis and Testing,Beijing Academy of Science and Technology(Beijing Centre for Physical and Chemical Analysis),Beijing Key Laboratory of Organic Materials Testing Technology and Quality Evaluation,Beijing 100089,China)

机构地区：[1]海南大学化学工程与技术学院,海南海口570228 [2]海南大学分析测试中心,海口市新药研发检测中心,海南海口570228 [3]北京市科学技术研究院分析测试研究所(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

出　　处：《光谱学与光谱分析》2022年第11期3380-3386,共7页Spectroscopy and Spectral Analysis

基　　金：海南省重点研发计划项目(ZDYF2020024;ZDYF2020186;ZDYF2020009);国家自然科学基金项目(22068011)资助。

摘　　要：以海南禁塑名录(第一批)中禁用不可降解塑料聚乙烯(PE)和乙烯-醋酸乙烯共聚物(EVA)为目标物,按不等质量梯度分别与聚己二酸/对苯二甲酸丁二醇酯(PBAT)和聚乳酸(PLA)等可生物降解聚合物熔融共混,进行复合物中PE和EVA的定性定量分析研究,以期为市场监督禁塑组分的违规添加提供数据。傅里叶变换红外光谱(FTIR)结合聚类分析,对PE-PBAT、EVA-PBAT、PE-PLA和EVA-PLA二元共混体系中的68个自制样品进行目标物鉴别及定量分析。结果表明,将所有光谱数据采用化学计量法分析研究,其聚类分析法可将样品分为3类,全波段下A=14,R^(2)X(cum)=0.997,Q 2(cum)=0.992。FTIR解析以峰形和峰位置筛选定性特征峰,以峰强变化筛选定量特征峰,其中PE-PBAT和EVA-PBAT体系有定性特征峰2918和2850 cm^(-1),定量特征峰2918,2850,1714和727 cm^(-1);PE-PLA体系有定性特征峰2918,2850和718 cm^(-1),定量特征峰2918,2850和1747 cm^(-1),另外1460 cm^(-1)谱带的强弱与组分比例不相关的特点可用于辅助定量;EVA-PLA体系包含定性特征峰2918,2850,1237和718 cm^(-1),定量特征峰2918,2850和1740 cm^(-1),红外定性分类结果与化学计量分析一致。进而探究峰强度比与禁塑组分含量的相关性,Spectrum Quant软件建立的定量模型表示:PBAT基共混材料的2918/727峰强度比与PE或EVA含量存在高度相关性,PE-PLA共混材料中2918/1460峰强比与PE含量存在高度相关性,EVA-PBAT共混材料中2918/1740峰强比与EVA含量有高度相关性;盲样验证显示残差值在±2.7%内。FTIR技术在禁塑组分PE和EVA定性定量分析中方法可靠,可实现简便快捷的半定量分析。A law on the one-time use of plastics was carried out as one measure of protecting the ecological environment in Hainan Province of China.The Hainan Forbidden Plastic List(first batch)is regulated to prohibit six non-degradable plastic compositions.The polyethylene(PE)and ethylene-vinyl acetate copolymer(EVA)were selected as detection targets in this simulating illicit-adding system.Poly(butylene adipate-co-terephthalate(PBAT)and polylactic acid(PLA)were chosen as the blend portions of simulating composites for their extensive application in bio-degradable plastics products.Then PE was blended with PBAT and PLA,respectively,according to the different mass percentages.Moreover,EVA was also blended with PBAT and PLA with the same formula,respectively.These simulating samples were provided for qualitative and quantitative testing of PE and EVA by Fourier transform infrared spectroscopy(FTIR)and cluster analysis(CLA).Their spectra screened the qualitative characteristic peaks by peak shape and wavenumbers.Furthermore,the characteristic quantitative peaks were screened for the correlation of peak-high ratios and the content of the non-degradable plastic components.Their quantitative curves were obtained and used for blind verification.The results showed that the mixture can be divided into three categories by applying all original spectral data in a chemometric method within 4000 to 400 cm^(-1) and the parameter of the classification model are A=14,R^(2) X(cum)=0.997,Q 2(cum)=0.992.The qualitative characteristic peaks of the PE-PBAT and EVA-PBAT systems were 2918 and 2850 cm^(-1),while the characteristic quantitative peaks were 2918,2850,1714 and 727 cm^(-1).The characteristic qualitative peaks of the EVA-PLA system were 2918,2850,1237 and 718 cm^(-1),and the characteristic quantitative peaks were 2918,2850 and 1740 cm^(-1).For the PE-PLA system,the characteristic qualitative peaks were 2918,2850 and 718 cm^(-1),and the characteristic quantitative peaks were 2918,2850 and 1747 cm^(-1).Otherwise,the 1460 cm^(-1) band i

关 键 词：红外光谱技术 聚类分析 定性定量检测 一次性不可降解塑料 

分 类 号：O657.3[理学—分析化学]