Understanding and Control of High Temperature Oxidation Flaws of Low-Density Poly(ethylene) with Raman Spectroscopy

M. Veitmann, R. Jumeau, P. Bourson, M. Ferriol, F. Lahure
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引用次数: 5

Abstract

Studies of high temperature oxidation of polyethylene are not much present in the literature though it can really be a problem especially in polymer production and processing. This study aims to detect oxidation flaws in polyethylene and to determine their impact on polymer structure and properties. Besides, we suggest a method via PLS-regression to determine the degree of flaws that can occur during polymer processing due to oxidation. Several kinds of oxidation flaws were reproduced in laboratory at 150°C in an oven operating in air and Raman spectroscopy analysis was performed on each sample. Using statistical tools as chemometrics on these spectra, we have built a Partial Least Square (PLS) model able to predict the oxidation degree of flaws. Interpretation of the model construction and further characterization tests show that oxidation can be followed with the evolution of the crystalline carbon group and of the created carbonyl functions. Finally we suggest possible mechanisms which can explain the high temperature oxidation process in LPDE, and we link them to the modification of the material properties.
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拉曼光谱对低密度聚乙烯高温氧化缺陷的认识与控制
聚乙烯高温氧化的研究在文献中并不多见,但它确实是一个问题,特别是在聚合物生产和加工中。本研究旨在检测聚乙烯中的氧化缺陷,并确定其对聚合物结构和性能的影响。此外,我们提出了一种通过pls回归的方法来确定由于氧化而在聚合物加工过程中可能发生的缺陷程度。在150°C的实验室空气烘箱中再现了几种氧化缺陷,并对每种样品进行了拉曼光谱分析。利用统计工具作为这些光谱的化学计量学,我们建立了一个能够预测缺陷氧化程度的偏最小二乘(PLS)模型。对模型构建的解释和进一步的表征测试表明,氧化可以随着结晶碳基团和生成的羰基功能的演化而发生。最后,我们提出了解释LPDE高温氧化过程的可能机制,并将其与材料性能的改变联系起来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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