Development of Hemp Fibre-Reinforced Interpenetrating Polymer Network (IPN)-Based Epoxy Composites Incorporating Epoxidized Rice Bran Oil

IF 3.1 4区工程技术 Q1 MATERIALS SCIENCE, TEXTILES

Fibers and Polymers Pub Date : 2026-07-24 DOI:10.1007/s12221-026-01526-1

Sampoorna Sriramula, Tarun Vakiti, Suresh Babu V, Raghu Raja Pandiyan Kuppusamy

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Abstract

The main objective of this study is to investigate the effect of accelerated weathering on the mechanical behaviour, failure modes, and service life of alkali-treated hemp fibre-reinforced composites with interpenetrating polymer networks (IPNs) developed with commercial epoxy and a bio-epoxy obtained from epoxidized waste rice bran oil (ERBO). The bio-resin (B) was blended with commercial epoxy (C) in ratios from 100C:0B to 50C:50B to form IPN matrices, which were characterized through chemical, thermal, and rheological analyses. FTIR and ¹H NMR confirmed successful epoxidation, while the resin exhibited shear-thinning flow behaviour and showed endothermic curing peak at 119 °C from DSC. Composites fabricated by hand lay-up were exposed to weathering for 500 and 1008 h at 60 °C, 0.7 W/m² UV intensity, and 100% relative humidity, followed by mechanical evaluation. The 90C:10B system showed the highest initial tensile, flexural, and interlaminar shear strengths (ILSS), which decreased 13.69%, 23.12%, and 9.79% after weathering, accompanied by a shift towards more elastic failure. Fractography revealed lower void content and reduced moisture uptake-about 3 wt.% less than the 100C:0B system. Service-life estimates based on 50% strength retention suggested useful durations of 3.73, 2.80, and 5.25 years for tensile, flexural, and ILSS performance.

Graphical Abstract

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含环氧米糠油的麻纤维增强互穿聚合物网络环氧复合材料的研制

本研究的主要目的是研究加速风化对碱处理的麻纤维增强互穿聚合物网络（IPNs）复合材料的力学性能、破坏模式和使用寿命的影响，这些互穿聚合物网络是由商业环氧树脂和从环氧化废米糠油（ERBO）中获得的生物环氧树脂制成的。将生物树脂(B)与商用环氧树脂(C)按100C:0B至50C:50B的比例混合，形成IPN基质，并通过化学、热和流变学分析对其进行表征。FTIR和1H NMR证实环氧化成功，而树脂表现出剪切变薄的流动行为，DSC在119°C处显示出吸热固化峰。采用手工铺层法制备复合材料，在60℃、0.7 W/m2紫外线强度、100%相对湿度条件下，分别进行500和1008 h的老化试验，然后进行力学性能评价。90C:10B体系的初始拉伸、弯曲和层间剪切强度（ILSS）最高，风化后分别下降13.69%、23.12%和9.79%，并向弹性破坏方向转变。断口形貌显示，与100C:0B体系相比，孔隙含量更低，吸湿率降低了约3 wt.%。基于50%强度保留的使用寿命估计表明，拉伸、弯曲和ILSS性能的有效持续时间为3.73年、2.80年和5.25年。图形抽象

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来源期刊

Fibers and Polymers 工程技术-材料科学：纺织

CiteScore

3.90

自引率

8.00%

发文量

267

审稿时长

3.9 months

期刊介绍： -Chemistry of Fiber Materials, Polymer Reactions and Synthesis- Physical Properties of Fibers, Polymer Blends and Composites- Fiber Spinning and Textile Processing, Polymer Physics, Morphology- Colorants and Dyeing, Polymer Analysis and Characterization- Chemical Aftertreatment of Textiles, Polymer Processing and Rheology- Textile and Apparel Science, Functional Polymers