Upgrading properties and circularity of the recycled flexible polypropylene by developing composites with an optimal combination of a fumed silica and maleated polypropylene copolymer: Influence of the addition of copolymer, type of fumed silica and the silica/copolymer ratio on packaging properties

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Polymer Testing Pub Date : 2024-08-23 DOI:10.1016/j.polymertesting.2024.108556

Eliezer Velásquez , Carol López-de-Dicastillo , Cristian Patiño Vidal , Guillermo Copello , C.J. Pérez , Abel Guarda , María José Galotto

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Abstract

Rigid polypropylene is mechanically recycled but flexible polypropylene is mostly used in energetic valorization because of the poor properties of the recycled polymer. A recycled polypropylene-based composite with outstanding properties for flexible food packaging was developed. For the first time, the influence of maleated polypropylene copolymer addition and the fumed silica/copolymer ratio on the packaging properties of recycled flexible polypropylene under the effects of silica hydrophilicity was investigated. The structural, morphological, thermal, mechanical, melt flow, overall migration, water vapor barrier and sealing properties of the developed nanocomposites were analyzed. Prominently, the addition of 1:1 maleated polypropylene and hydrophobic nanosilica improved the global performance of all tested methods. The recycled polypropylene had an overall migration to olive oil of 17 mg dm⁻², exceeding the limit allowed for food packaging, but the developed added-value composite reduced it to the tolerance limit according EU legislation. The seal strength was drastically increased by 50 % with adhesive peeling, high thermal stability, and well-dispersed particles without affecting the ductility.

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通过开发气相二氧化硅与马来酸化聚丙烯共聚物最佳组合的复合材料，提高再生柔性聚丙烯的性能和圆度：共聚物添加量、气相法二氧化硅类型以及二氧化硅/共聚物比例对包装性能的影响

硬质聚丙烯可以机械回收，但由于回收聚合物的性能较差，柔性聚丙烯大多被用于能值化。我们开发了一种用于食品软包装的再生聚丙烯基复合材料，它具有出色的性能。首次研究了在二氧化硅亲水性影响下，马来酸化聚丙烯共聚物添加量和气相二氧化硅/共聚物比例对再生柔性聚丙烯包装性能的影响。分析了所开发纳米复合材料的结构、形态、热、机械、熔体流动、整体迁移、水蒸气阻隔和密封性能。添加 1:1 的马来酸化聚丙烯和疏水性纳米二氧化硅显著改善了所有测试方法的整体性能。回收聚丙烯对橄榄油的总体迁移量为 17 mg dm-2，超过了食品包装的允许限值，但开发的增值复合材料将其降低到了欧盟法律规定的容许限值。在不影响延展性的情况下，密封强度大幅提高了 50%，同时还具有粘合剂剥离性、高热稳定性和良好的颗粒分散性。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.