POTENTIAL SUSTAINABLE ANTIOXIDANTS FOR NATURAL RUBBER: HENNA AND ITS MAJOR COMPONENTS

IF 1.2 4区工程技术 Q4 POLYMER SCIENCE

Rubber Chemistry and Technology Pub Date : 2021-06-09 DOI:10.5254/rct.21.79907

Şehriban Öncel, A. A. Wis, B. Karaağaç

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引用次数: 0

Abstract

Unsaturated chain structure of natural rubber makes it a poor defense against thermo-oxidative aging. Synthetic antioxidants are commonly used in rubber compound recipes to prevent/retard aging of the rubber material during its service life. However, synthetic antioxidants cause some negative effects on human and environmental health; they tend to be replaced by natural alternatives. In this study, the short- and long-term antioxidant effects of henna and its basic active components, lawsone and gallic acid, have been investigated individually for natural rubber cured with semi-efficient sulfur vulcanization system. The composition of henna was determined by gas chromatography-mass spectrometry (GC-MS) analysis. Qualitative and quantitative analysis were performed using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) to highlight structural changes on aged vulcanizates. The authors attempted to correlate the suggested aging mechanism with rheological, mechanical, and morphological properties. Results showed that both lawsone and gallic acid were impressively successful regarding their anti-oxidation activity. In addition, henna, which contains a sufficient amount of lawsone and gallic acid, has been suggested as a competitive natural alternative to the common synthetic stabilization system for natural rubber, considering its sustainable commercial abundancy.

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天然橡胶潜在的可持续抗氧化剂:指甲花及其主要成分

天然橡胶的不饱和链结构使其抗热氧化老化能力较差。合成抗氧剂是橡胶复合配方中常用的抗氧剂，用于防止/延缓橡胶材料在使用寿命期间的老化。然而，合成抗氧化剂对人体健康和环境健康造成一定的负面影响;它们往往会被天然替代品所取代。本研究分别研究了指甲花及其基本活性成分lawsone和没食子酸对半高效硫硫化体系固化的天然橡胶的短期和长期抗氧化作用。采用气相色谱-质谱联用(GC-MS)法测定指甲花的成分。利用傅里叶变换红外光谱(FTIR)和x射线光电子能谱(XPS)进行定性和定量分析，以揭示老化硫化胶的结构变化。作者试图将提出的老化机制与流变学、力学和形态特性联系起来。结果表明，lawsonone和没食子酸均具有良好的抗氧化活性。此外，指甲花含有足够量的lawsone和没食子酸，考虑到其可持续的商业丰度，已被认为是天然橡胶常用合成稳定体系的竞争性天然替代品。

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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来源期刊

Rubber Chemistry and Technology 工程技术-高分子科学

CiteScore

3.50

自引率

20.00%

发文量

审稿时长

3.6 months

期刊介绍： The scope of RC&T covers: -Chemistry and Properties- Mechanics- Materials Science- Nanocomposites- Biotechnology- Rubber Recycling- Green Technology- Characterization and Simulation. Published continuously since 1928, the journal provides the deepest archive of published research in the field. Rubber Chemistry & Technology is read by scientists and engineers in academia, industry and government.