Natural antioxidant from bamboo leaves for the processing stability of polypropylene
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Natural antioxidant from bamboo leaves for the processing stability of polypropylene Huimin Xia1 · Hui Gao1 · Yuxi Zhang1 · Zhongwei Wang1 · Liang Song1 · Lei Liu1 · Xiujuan Tian1 · Xiaowen Huang1 · Qing Yu1 Received: 5 March 2020 / Accepted: 22 July 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The antioxidant of bamboo leaves (AOB) was used firstly to stabilize polypropylene (PP). Thermogravimetric analysis, oxidation onset temperature and oxidation induction time tests were carried out to test the thermal and thermo-oxidative stability of samples. The melt flow rate and yellowness index were used to characterize the processing stability and color of samples. Field emission scanning electron microscopy was used to determine the distribution of additives. Results showed that AOB improved the thermo-oxidative stability and processing stability of PP. The efficacy of AOB was comparable with that of Irganox 1010 in protecting PP. However, due to the dark yellow color of AOB, the problem of the discoloration of the polymer matrix was not solved. Keywords Polypropylene · Natural antioxidant · Bamboo leaf flavone
Introduction Polyolefins are widely used in food packaging, containers, toys, water pipes, medicines, etc. [1]. However, due to the tertiary carbon and side chain in its chemical structure, PP is inevitably affected by heat, oxygen and mechanical shear during processing and storage, which would result in the degradation and decrease of the mechanical properties of PP products. To address this problem, scientists have explored numerous polyolefin stabilizers [2–6]. Typically, the used stabilizers include a primary (hindered phenolic compounds) and a secondary antioxidant (phosphorous or sulfuric compounds). However, an earlier study by Brocca Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10973-020-10115-0) contains supplementary material, which is available to authorized users. Huimin Xia and Hui Gao have contributed equally to this work. * Xiaowen Huang [email protected] * Qing Yu [email protected] 1
College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
and co-workers drew public attentions on such compounds [3]. They reported that traditional phenolic antioxidants pose a possible hazard to the environment and human health. However, to date, there has been no practical and promising way to solve this problem in the industry. Accordingly, much more attention has been placed on the green and environmentally friendly additives. Natural compounds, from plants and fruits, have widely been used in medicine. The benefits of such compounds have come into the sight of scientists devoted to the stabilization modification of polymers. Curcumin [4, 5], quercetin [6, 7], β-carotene [8, 9], mimosa tannin [10], dihydromyricetin [11, 12], the derivative of caffeic acid [13], ferulic acid and spent coffee grounds and the extracts of nutshell [14–16], grape waste and cork were used in the modificatio
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