色谱

色谱

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裂解氢化气相色谱/质谱法对聚乙烯类塑料裂解氢化产物微细结构的鉴别

丁军凯 宋 鸣 黄丽   

  1. Liaoning Criminal Science and Technology Institute, Shenyang 110032, China
  • 收稿日期:2005-12-02 修回日期:2006-06-30 出版日期:2006-09-30 发布日期:1986-09-25
  • 通讯作者: 丁军凯

Microstructural Characterization for Pyrolysis Hydrogenation Fragments in Polyethylene by Pyrolysis Hydrogenation Gas Chromatography/Mass Spectrometry

DING Junkai, SONG Ming, HUANG Li   

  1. Liaoning Criminal Science and Technology Institute, Shenyang 110032, China
  • Received:2005-12-02 Revised:2006-06-30 Online:2006-09-30 Published:1986-09-25
  • Contact: Ding Junkai

PDF

579

被引次数

6

摘要： 采用裂解氢化气相色谱/质谱(Py-H-GC/MS)分析技术,对国内12个厂家、国外12个厂家生产的高密度聚乙烯、低密度聚乙烯、线性低密度聚乙烯及乙烯和α-烯烃共聚物类塑料的47个样品进行了分析。发现主链中存在的甲基短支链特征组分的含量与聚乙烯的类别有关,根据裂解氢化产物C12～C13之间存在的4个甲基短支链（5-甲基十二烷(5-MC12)、4-甲基十二烷(4-MC12)、2-甲基十二烷(2-MC12)、3-甲基十二烷(3-MC12)）相对含量的变化,可以将47个样品划分为8个类别。该方法的建立为法庭科学中常见的聚乙烯类塑料物证的鉴别提供了进一步的科学分析依据。

关键词: 甲基短支链, 聚乙烯类塑料 , 裂解氢化气相色谱/质谱, 微细结构分析

Abstract: The microstructural characterization of 47 samples, respectively of high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), copolymer of ethylene and α-olefins, was performed by pyrolysis hydrogenation gas chromatography/mass spectrometry (Py-H-GC/MS) with 10% Pt on 80-100 mesh Diasolid H as a hydrogenation catalyst. The samples were obtained from 12 domestic plants and 12 plants abroad as well. The sample sizes ranging from 30 to 80 μg were pyrolyzed at 770 ℃ in a flow of hydrogen carrier gas. It was found that short methyl branches as the characteristic isoalkanes of pyrolysis hydrogenation in polyethylene would be related closely to the different classes of polyethylene. The microstructural characterization has been carried out by means of Py-H-GC/MS, according to the relative amount of the four short methyl branches, 5-methyldodecane (5-MC12), 4-methyldodecane (4-MC12), 2-methyldodecane (2-MC12) and 3-methyldodecane (3-MC12) existed in C12-C13 isoalkanes. The Py-H-GC/MS technique will be providing further scientific evidences for the characterization of polyethylene plastics in forensic science.

Key words: microstructural characterization, polyethylene , short methyl branches, pyrolysis hydrogenation gas chromatography/mass spectrometry (Py-H-GC/MS)