Optimization of concentrations of natural antioxidants (curcumin) to enhance the thermal stability of ultra high molecular weight polyethylene (UHMWPE)

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-31 DOI:10.1007/s11144-024-02697-9

Nidhi Khattar, Jagriti, Shagun Kainth, Piyush Sharma, Vishal Ahlawat, Urmila Berar, Pawan K. Diwan

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Abstract

The impact of different concentrations of natural antioxidants (curcumin) on the thermal stability of UHMWPE (ultra-high molecular weight polyethylene) is examined via the thermogravimetric (TGA/DTA) technique, in the temperature region 50–600 °C at a 5 °C/min heating rate. This work employs the model fitting (Coats and Redfern) approach to determine the optimal curcumin concentration. UHMWPE samples at optimum concentration are further subjected to three other heating rates, viz., 10, 15 and 20 °C. A bi-Gaussian asymmetric function is utilized for deconvolution to elucidate the complexities of thermal decomposition. Through deconvolution, two peaks are obtained and the activation energy corresponding to each peak is determined through two iso-conversional kinetic (Friedman and Starink) models. By utilizing activation energy, the random nucleation reaction mechanism involved in thermal decomposition is recognized. Finally, changes in entropy \(\left(\Delta S\right)\), enthalpy \(\left(\Delta H\right)\) and Gibbs free energy \(\left(\Delta G\right)\) are determined.

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优化天然抗氧化剂（姜黄素）的浓度，提高超高分子量聚乙烯（UHMWPE）的热稳定性

通过热重（TGA/DTA）技术，在 50-600 °C 的温度范围内，以 5 °C/min 的加热速率，研究了不同浓度的天然抗氧化剂（姜黄素）对超高分子量聚乙烯（UHMWPE）热稳定性的影响。这项工作采用模型拟合（Coats 和 Redfern）方法来确定姜黄素的最佳浓度。采用最佳浓度的超高分子量聚乙烯样品还需接受其他三种加热速率，即 10、15 和 20 °C。利用双高斯不对称函数进行解卷积，以阐明热分解的复杂性。通过解卷积得到两个峰值，并通过两个等转换动力学（Friedman 和 Starink）模型确定每个峰值对应的活化能。利用活化能，可以识别热分解中的随机成核反应机制。最后，熵（left(\Delta S\right)）、焓（left(\Delta H\right)）和吉布斯自由能（left(\Delta G\right)）的变化被确定下来。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.