Improvement of Thermal Protection in Recycled Polyolefins through Hybrid Mesoporous Silica–Antioxidant Particles

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Recycling Pub Date : 2024-01-02 DOI:10.3390/recycling9010003
Enrique Blázquez-Blázquez, R. Barranco-García, Tamara M. Díez-Rodríguez, Pilar Posadas, Ernesto Pérez, M. Cerrada
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Abstract

The deficient management of plastic waste has caused a serious worldwide environmental problem. Thus, one of the main challenges for the industry in the plastics sector in contributing to sustainability and a circular economy consists of providing a subsequent service life to this waste. For that purpose, the appropriate incorporation of antioxidants will play a key role in preventing or postponing the degradation of plastic waste, where the formation of radicals is initiated during its previous lifetime by the action of degrading agents. Functionalized particles, based on mesoporous MCM-41 silica with Irganox 1076, were prepared with two different protocols and were further incorporated into a material containing virgin PP and 30 wt.% of recycled PP, with the purpose of guaranteeing thermal stability during its next service life. A very significant increase in the thermal stability of the resulting composites was found, attributable to the synergistic action between the Irganox 1076 antioxidant and the MCM-41 particles. In addition, the presence of hybrid particles leads to an important nucleating effect for the crystallization of PP. Moreover, a reinforcing role was also played by these modified mesoporous silicas in the resultant systems. The presented methodology constitutes, therefore, a promising strategy for contributing to the circular economy—since the synergy between the Irganox 1076 antioxidant and MCM-41 particles was found to play an important role in the ultimate performance of recycled polyolefins.
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通过介孔二氧化硅-抗氧化剂混合颗粒提高回收聚烯烃的热保护性能
塑料废弃物管理不善已造成严重的世界性环境问题。因此,塑料行业在促进可持续发展和循环经济方面面临的主要挑战之一,就是如何延长废塑料的使用寿命。为此,适当加入抗氧化剂将在防止或延缓塑料废弃物降解方面发挥关键作用,因为在塑料废弃物之前的使用寿命中,降解剂的作用会导致自由基的形成。基于介孔 MCM-41 硅石和 Irganox 1076 的功能化颗粒采用两种不同的方法制备,并进一步加入到含有原生聚丙烯和 30 wt.% 再生聚丙烯的材料中,目的是保证其在下一个使用寿命期间的热稳定性。结果发现,由于 Irganox 1076 抗氧化剂和 MCM-41 颗粒之间的协同作用,复合材料的热稳定性有了非常明显的提高。此外,混合颗粒的存在还对 PP 的结晶产生了重要的成核效应。此外,这些改性介孔硅还在生成的体系中发挥了强化作用。因此,所介绍的方法是促进循环经济的一种有前途的策略,因为研究发现 Irganox 1076 抗氧化剂和 MCM-41 颗粒之间的协同作用对再生聚烯烃的最终性能起着重要作用。
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来源期刊
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
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