Assessment of Long-Term Water Absorption on Thermal, Morphological, and Mechanical Properties of Polypropylene-Based Composites with Agro-Waste Fillers

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-07-26 DOI:10.3390/jcs8080288

T. Zhiltsova, Andreia Costa, Mónica S. A. Oliveira

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引用次数: 0

Abstract

Agro-waste fibres for polymer composite reinforcement have gained increased interest in industry and academia as a more sustainable alternative to synthetic fibres. However, natural fibre composite (NFC) hygroscopicity is still an issue that needs to be solved. This work investigates how prolonged exposure to water affects the properties of the polypropylene (PP)-based injection-moulded composites reinforced with different contents of rice husk (rh) and olive pit (op) fibres. Both rh and op composites became more hydrophilic with increased fibre charge due to the affinity of cellulose and hemicellulose OH groups. Meanwhile, lignin contributes to the protection of the composites from thermo-oxidative degradation caused by water immersion. The PPrh composites had a higher saturation water content of 1.47% (20 wt.% rh) and 2.38% (30 wt.% rh) in comparison to PPop composites with an absorption of 1.13% (20 wt.% op) and 1.59% (30 wt.% op). The tensile elastic modulus has slightly increased, at the cost of the increased saturated composites’ rigidity, in composites with 30% rh and op fibre content (up to 13%) while marginally decreasing (down to 8%) in PP30%op compared to unsaturated counterparts. A similar trend was observed for the flexural modulus, enhanced up to 18%. However, rh and op composites with 30% fibre content ruptured in bending, highlighting their fragility after hydrolytic ageing.

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评估长期吸水对含农业废弃物填料的聚丙烯基复合材料的热、形态和机械性能的影响

作为合成纤维的一种更具可持续性的替代品，用于聚合物复合材料加固的农产废料纤维越来越受到工业界和学术界的关注。然而，天然纤维复合材料（NFC）的吸湿性仍然是一个亟待解决的问题。这项研究探讨了长期暴露在水中如何影响使用不同含量的稻壳（rh）纤维和橄榄核（op）纤维增强的聚丙烯（PP）基注塑复合材料的性能。由于纤维素和半纤维素羟基的亲和性，随着纤维电荷的增加，稻壳纤维和橄榄核纤维复合材料的亲水性增强。同时，木质素有助于保护复合材料免受浸水引起的热氧化降解。PPrh 复合材料的饱和含水量为 1.47%（20 wt.% rh）和 2.38%（30 wt.% rh），而 PPop 复合材料的饱和含水量为 1.13%（20 wt.% op）和 1.59%（30 wt.% op）。纤维含量为 30% rh 和 op 的复合材料的拉伸弹性模量略有增加（最高达 13%），而 PP30%op 复合材料的拉伸弹性模量与未饱和复合材料相比则略有下降（降至 8%），这是以饱和复合材料刚性的增加为代价的。弯曲模量也有类似的趋势，最高提高了 18%。然而，纤维含量为 30% 的 rh 和 op 复合材料在弯曲时会断裂，这表明它们在水解老化后很脆弱。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico