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一种可再生的桐油衍生丁腈橡胶及其在环氧增韧改性剂中的潜在用途。

A renewable tung oil-derived nitrile rubber and its potential use in epoxy-toughening modifiers.

作者信息

Xiao Laihui, Liu Zengshe, Hu Fangfang, Wang Yigang, Huang Jinrui, Chen Jie, Nie Xiaoan

机构信息

Institute of Chemical Industry of Forestry Products, CAF, National Engineering Lab for Biomass Chemical Utilization, Key Lab on Forest Chemical Engineering, SFA, Key Lab of Biomass Energy and Material Nanjing Jiangsu 210042 PR China

Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University China.

出版信息

RSC Adv. 2019 Aug 19;9(44):25880-25889. doi: 10.1039/c9ra01918a. eCollection 2019 Aug 13.

DOI:10.1039/c9ra01918a
PMID:35530098
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9070381/
Abstract

In this study, a modifier (CTMA) prepared by emulsion copolymerization of tung oil fatty acid, methyl esters of tung oil fatty acid and acrylonitrile was used to toughen epoxy resins. The structural characterization of the copolymer was carried out by Fourier transform infrared spectroscopy, H NMR spectroscopy and high-temperature gel permeation chromatography. Mechanical testing, thermal characterization and scanning electron microscopy were conducted to investigate the properties of epoxy resin modified by the copolymer and further reveal its toughening mechanism. The results indicated that the newly synthesized copolymer effectively toughened the epoxy resin because the elongation-at-break was increased to 89.48%, the maximum toughness calculated by work before break was nearly 4.6 times that of the neat epoxy resin, and apparent shear yields and plastic deformations were observed in the morphology of the fractured surfaces. CTMA, which acts as a flexible cross-linker in the epoxy thermoset, may decrease the cross-linking density.

摘要

在本研究中，由桐油脂肪酸、桐油脂肪酸甲酯与丙烯腈经乳液共聚制备的改性剂（CTMA）被用于增韧环氧树脂。通过傅里叶变换红外光谱、核磁共振氢谱和高温凝胶渗透色谱对共聚物进行结构表征。进行力学测试、热性能表征和扫描电子显微镜观察，以研究该共聚物改性环氧树脂的性能，并进一步揭示其增韧机理。结果表明，新合成的共聚物有效地增韧了环氧树脂，因为其断裂伸长率提高到了89.48%，通过断裂前功计算得到的最大韧性几乎是纯环氧树脂的4.6倍，并且在断裂表面形态中观察到明显的剪切屈服和塑性变形。CTMA在环氧热固性材料中作为柔性交联剂，可能会降低交联密度。

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本文引用的文献

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Processing bulk natural wood into a high-performance structural material.将大块天然木材加工成高性能结构材料。
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