Mechanical properties of sugarcane fiber/polyurethane–epoxy IPN composites: effects of PU molecular weight and fiber interfacial modification

IF 4.2 3区化学 Q2 POLYMER SCIENCE

Polymer Bulletin Pub Date : 2026-10-05 DOI:10.1007/s00289-026-06711-z

JinLin Han, ChouJung Tsao, HungTa Wu, KuanLiang Liu

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引用次数: 0

Abstract

This study reports the fabrication and characterization of sugarcane fiber/polyurethane–epoxy interpenetrating polymer network (IPNs) composites, with emphasis on the influence of polyurethane (PU) molecular weight (PPG450 and PPG1000), PU content, and fiber surface modification. Sugarcane fibers (SCF) were treated with ethanol and 3-glycidoxypropyltrimethoxysilane (GPS) to enhance interfacial compatibility. Mechanical testing revealed that GPS modification effectively improved tensile strength (up to 39.3 MPa), while interfacial modifications achieved higher flexural strength, with a maximum of 62 MPa at 50 wt% SCF. Dynamic mechanical analysis (DMA) and SEM observations revealed that increasing the SCF content enhanced the storage modulus and contributed to improved thermal stability, which is attributed to reinforced interfacial interactions and reduced matrix mobility. The PU molecular weight influenced the flexibility of the composite and the distribution of the IPN structure. These findings highlight the critical role of fiber modification, PU characteristics, and fiber loading in optimizing the performance of natural fiber-reinforced IPN composites, providing guidance for their development in structural and functional applications.

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甘蔗纤维/聚氨酯-环氧IPN复合材料力学性能：PU分子量和纤维界面改性的影响

本研究报道了甘蔗纤维/聚氨酯-环氧互穿聚合物网络（IPNs）复合材料的制备和表征，重点研究了聚氨酯（PU）分子量（PPG450和PPG1000）、PU含量和纤维表面改性的影响。采用乙醇和3-缩水氧基丙基三甲氧基硅烷（GPS）对甘蔗纤维（SCF）进行处理，以提高其界面相容性。力学测试表明，GPS改性有效地提高了抗拉强度（高达39.3 MPa），而界面改性获得了更高的抗折强度，在50% SCF下最大可达62 MPa。动态力学分析（DMA）和扫描电镜观察表明，SCF含量的增加提高了材料的储存模量，并有助于改善热稳定性，这是由于界面相互作用增强和基体迁移率降低所致。聚氨酯的分子量影响了复合材料的柔韧性和IPN结构的分布。这些发现强调了纤维改性、PU特性和纤维载荷在优化天然纤维增强IPN复合材料性能中的关键作用，为其在结构和功能应用方面的发展提供了指导。

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来源期刊

Polymer Bulletin 化学-高分子科学

CiteScore

6.00

自引率

6.20%

发文量

审稿时长

5.5 months

期刊介绍： "Polymer Bulletin" is a comprehensive academic journal on polymer science founded in 1988. It was founded under the initiative of the late Mr. Wang Baoren, a famous Chinese chemist and educator. This journal is co-sponsored by the Chinese Chemical Society, the Institute of Chemistry, and the Chinese Academy of Sciences and is supervised by the China Association for Science and Technology. It is a core journal and is publicly distributed at home and abroad. "Polymer Bulletin" is a monthly magazine with multiple columns, including a project application guide, outlook, review, research papers, highlight reviews, polymer education and teaching, information sharing, interviews, polymer science popularization, etc. The journal is included in the CSCD Chinese Science Citation Database. It serves as the source journal for Chinese scientific and technological paper statistics and the source journal of Peking University's "Overview of Chinese Core Journals."