High‐strength, tough, and hygrothermal aging‐resistant UV cationic‐cured epoxy resin improved by castor oil fatty acid

IF 3.6 4区工程技术 Q2 ENGINEERING, CHEMICAL

Polymer Engineering and Science Pub Date : 2025-01-29 DOI:10.1002/pen.27114

Yecheng Fan, Shiyu Chen, Zhaoran Xu, Pengfei Shen, Xuewen Guo, Yiwu Quan

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引用次数: 2

Abstract

Abstract This work investigated the effect of toughening agents on the hygrothermal aging resistance of ultraviolet (UV) cationic‐cured epoxy resin 3,4‐epoxycyclohexymethyl‐3′,4′‐epoxycyclohexyl carboxylate (CE). After being toughened by polycaprolactone diol (PCL), the resulting epoxy sample (PCL‐CE) exhibited excellent toughness but poor hygrothermal aging resistance, with a tensile strength of 39.8 MPa and elongation at break of 16.9%. After being toughened by poly(tetramethylene ether glycol) (PTMG), the resulting epoxy sample (PTMG‐CE) showed good hygrothermal aging resistance but limited toughness, with a tensile strength of 33.9 MPa and elongation at break of 8.2%. Another epoxy sample (COFA‐CE) was prepared by introducing hydrophobic castor oil fatty acid (COFA) into CE, which combined the high toughness of PCL‐CE and the hygrothermal aging resistance of PTMG‐CE, reaching a tensile strength of 47.8 MPa and elongation at break of 12.9%. After 72 h of hygrothermal aging at 50°C and 100% RH, COFA‐CE retained 46.9% and 88.8% of its original tensile strength and storage modulus, respectively. These were higher than the values retained by PCL‐CE (16.6% and 49.9%) and PTMG‐CE (44.5% and 77.7%). Finally, the hygrothermal aging study revealed that the performance of the epoxy samples degraded due to plasticization caused by moisture absorption, but the properties could be recovered after drying. Highlights Castor oil fatty acid (COFA) was employed to modify UV‐cured epoxy resin (CE). The pre‐reaction between COFA and CE increased their compatibility. Epoxy sample COFA‐CE showed a high toughness and hygrothermal aging resistance.

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蓖麻油脂肪酸改性的高强度、高韧性、耐湿热老化的UV阳离子固化环氧树脂

摘要本文研究了增韧剂对紫外光（UV）阳离子固化环氧树脂3,4‐环氧环己基甲基- 3′，4′‐环氧环己基羧酸酯（CE）耐湿热老化性能的影响。经聚己内酯二醇（PCL）增韧后，得到的环氧树脂样品（PCL‐CE）具有良好的韧性，但耐湿热老化性能较差，拉伸强度为39.8 MPa，断裂伸长率为16.9%。经聚四亚甲基醚乙二醇（PTMG）增韧后，得到的环氧树脂样品（PTMG‐CE）具有良好的耐湿热老化性能，但韧性有限，抗拉强度为33.9 MPa，断裂伸长率为8.2%。在CE中引入疏水蓖麻油脂肪酸（COFA）制备了另一种环氧树脂样品（COFA‐CE），该样品结合了PCL‐CE的高韧性和PTMG‐CE的耐湿热老化性能，抗拉强度达到47.8 MPa，断裂伸长率达到12.9%。在50℃和100%相对湿度条件下，COFA‐CE经过72 h的湿热老化后，其拉伸强度和储存模量分别保持了46.9%和88.8%。这些值高于PCL‐CE（16.6%和49.9%）和PTMG‐CE（44.5%和77.7%）。最后，湿热老化研究表明，由于吸湿引起的塑化，环氧树脂样品的性能下降，但干燥后性能可以恢复。用蓖麻油脂肪酸（COFA）改性环氧树脂（CE）。COFA和CE的预反应增强了它们的相容性。环氧树脂样品COFA‐CE表现出高韧性和耐湿热老化性能。

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来源期刊

Polymer Engineering and Science 工程技术-高分子科学

CiteScore

5.40

自引率

18.80%

发文量

329

审稿时长

3.7 months

期刊介绍： For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology. The importance of PE&S is underscored by the frequent rate at which its articles are cited, especially by other publications - literally thousand of times a year. Engineers, researchers, technicians, and academicians worldwide are looking to PE&S for the valuable information they need. There are special issues compiled by distinguished guest editors. These contain proceedings of symposia on such diverse topics as polyblends, mechanics of plastics and polymer welding.