Influence of Density on Degradation Properties of Polyethylene after Photo-oxidation Aging

Jun DAI; Hua YAN; Jun-jun GUO; Zhi-de HU; Jian-jian YANG; Han-song ZHANG

doi:10.14028/j.cnki.1003-3726.2017.02.007

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Influence of Density on Degradation Properties of Polyethylene after Photo-oxidation Aging

更新时间：2022-09-06

- Influence of Density on Degradation Properties of Polyethylene after Photo-oxidation Aging
- Polymer Bulletin Vol. 30, Issue 2, Pages: 46-55(2017)
- 作者机构：
  
  1.中国人民解放军后勤工程学院，化学与材料工程系，重庆 401331
  2.73801部队，无锡 214000
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2017.02.007
  CLC：
- Published：01 February 2017，
  
  Received：16 July 2016，
  
  Revised：21 October 2016，
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Jun DAI, Hua YAN, Jun-jun GUO, Zhi-de HU, Jian-jian YANG, Han-song ZHANG. Influence of Density on Degradation Properties of Polyethylene after Photo-oxidation Aging. [J]. Polymer Bulletin 30(2):46-55(2017)
DOI：

Jun DAI, Hua YAN, Jun-jun GUO, Zhi-de HU, Jian-jian YANG, Han-song ZHANG. Influence of Density on Degradation Properties of Polyethylene after Photo-oxidation Aging. [J]. Polymer Bulletin 30(2):46-55(2017) DOI： 10.14028/j.cnki.1003-3726.2017.02.007.

摘要

利用力学试验、凝胶渗透色谱（GPC）、热重分析法（TG）、差示扫描量热法（DSC）、衰减全反射红外光谱技术（ATR-FTIR）、扫描电子显微镜（SEM）比较研究了不同密度聚乙烯（HDPE、LDPE、LLDPE和MDPE）的光氧老化特性，分析了密度对聚乙烯力学性能、分子量、热稳定性、熔融特性、化学结构和表面微观形貌的影响规律。结果表明LDPE弯曲性能、热分解特征温度和氧化诱导温度下降最明显，且区别主要集中在老化初期。老化24 d后，HDPE和LDPE冲击强度均已降低。老化64 d后，4种PE相对分子质量均下降，其中LDPE相对重均分子质量下降更强烈。LDPE和LLDPE不饱和度增长最快，四种样品支化度变化无明显区别，LDPE的分子链断链作用和氧化作用最为强烈，羰基指数和羟基指数增长最快，表面破坏更严重，由于支链的存在破坏了聚乙烯分子链的规整性，导致LDPE更容易发生老化。

Abstract

In order to analyze the influence of density on photo-oxidation degradation properties of polyethylene (PE)

the materials parameters (mechanical properties

thermal stability

melting characteristic

chemical structure and surface morphology) of different density polyethylene including high

low

linear low and medium density polyethylene (HDPE

LDPE

LLDPE and MDPE) were studied by mechanical experiments

gel permeation chromatography (GPC)

thermogravimetry analysis (TGA)

differential scanning calorimetry (DSC)

attenuated total reflection infrared spectroscopy (ATR-FTIR) and scanning electron microscope (SEM). The results show that LDPE resulted in the decreased faster in the bending property

thermogravimetry analysis characteristic temperature and oxidation induction temperature mainly concentrated in the early part of aging. After 24 days of aging

the impact strength of HDPE and LDPE decreased. After 64 days of aging

the molecular weight of different density polyethylene decreased and the variations of weight average molecular weight of LDPE decreased more intensely. The degree of unsaturation of LDPE and LLDPE increased significantly and there were no obvious differences in the variations of chain branching of the different density polyethylene. The variations of chain breaking

oxidation

carbonyl index

hydroxyl index and surface morphology of LDPE were more significantly and severe. The branch breaking the regularity leaded that LDPE was prone to aging.

关键词

聚乙烯光氧老化比较研究老化特性衰减全反射红外光谱

Keywords

PolyethylenePhoto-oxidation agingComparative researchDegradation propertiesATR-FTIR

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