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不同类型聚乙烯片材中影响紫外线诱导光降解因素的研究

Study of Factors Affecting UV-Induced Photo-Degradation in Different Types of Polyethylene Sheets.

作者信息

Du Bochu, Lee Chenghao, Ji Ying

机构信息

Research Centre for Resources Engineering towards Carbon Neutrality, Research Institute for Intelligent Wearable Systems, Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China.

出版信息

Polymers (Basel). 2024 Sep 25;16(19):2709. doi: 10.3390/polym16192709.

DOI:10.3390/polym16192709
PMID:39408419
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11478657/
Abstract

Enhancing the degradability of polyethylene plastics could provide a potential solution to the overwhelming crisis of plastic waste. Conventional studies have focused on the degradation of polyethylene thin films. This study investigated UV-induced photo-degradation according to ASTM D5208-14 in polyethylene sheets with thicknesses ranging from 0.4 to 1.2 mm. The impacts of sample thickness, metal pro-oxidants, polyethylene resin types and foaming were explored through the characterization of the carbonyl index, molecular weight, tensile properties and crystallinity. As pro-oxidants, single iron or manganese stearate demonstrated a concentration-dependent trend in accelerating the photo-degradation of polyethylene sheets. The thickness, foaming and resin type-such as low-density polyethylene (LDPE) and high-density polyethylene (HDPE)-significantly impacted the rate of photo-oxidation. Thick polyethylene sheets (1.2 mm) exhibited a heterogenous and depth-dependent degradation profile. As the photo-degradation progressed, the enhanced crystallinity, reduced UV transmittance and formation of crosslinks were able to prevent further oxidative cleavage of the polyethylene chain. This study investigated the time course and factors affecting the photo-degradation of polyethylene sheets, which could provide insights into the formulation design of photo-degradable polyethylene plastics.

摘要

提高聚乙烯塑料的可降解性可为塑料垃圾泛滥的危机提供潜在解决方案。传统研究主要集中在聚乙烯薄膜的降解上。本研究依据ASTM D5208 - 14对厚度在0.4至1.2毫米之间的聚乙烯片材进行紫外线诱导光降解研究。通过羰基指数、分子量、拉伸性能和结晶度的表征，探究了样品厚度、金属助氧化剂、聚乙烯树脂类型和发泡对光降解的影响。作为助氧化剂，单硬脂酸铁或锰在加速聚乙烯片材光降解方面呈现浓度依赖性趋势。厚度、发泡以及树脂类型（如低密度聚乙烯（LDPE）和高密度聚乙烯（HDPE））对光氧化速率有显著影响。厚的聚乙烯片材（1.2毫米）呈现出非均匀且随深度变化的降解特征。随着光降解的进行，结晶度增加、紫外线透过率降低以及交联的形成能够阻止聚乙烯链的进一步氧化裂解。本研究考察了聚乙烯片材光降解的时间进程及影响因素，可为光降解聚乙烯塑料的配方设计提供见解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/30589b09d0dd/polymers-16-02709-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/4f5191416b12/polymers-16-02709-g001a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/dc7ccbbb8a3e/polymers-16-02709-g002a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/f58f382f488e/polymers-16-02709-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/dafadf515853/polymers-16-02709-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/d8659a68dee5/polymers-16-02709-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/30589b09d0dd/polymers-16-02709-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/4f5191416b12/polymers-16-02709-g001a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/dc7ccbbb8a3e/polymers-16-02709-g002a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/f58f382f488e/polymers-16-02709-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/dafadf515853/polymers-16-02709-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/d8659a68dee5/polymers-16-02709-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9cc2/11478657/30589b09d0dd/polymers-16-02709-g006.jpg

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本文引用的文献

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Microplastic Contamination in Soils: A Review from Geotechnical Engineering View.土壤中的微塑料污染：基于岩土工程视角的综述
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