Abstract The present work is focused on the study of the formulation effect of cationically polymerized vegetable oil thermoset on their aging behavior. Toward this aim, tung oil-based biopolymers were prepared using different comonomers or adding a modifier. Specifically, synthetic and natural comonomers (styrene, divinylbenzene and a methyl ester of tung oil) and a modifier (acrylated epoxidized soybean oil) were used to prepare different crosslinked samples with a fixed weight ratio of tung oil/comonomer (or modifier) = 70/30. The chemical aging suffered by the fatty acid segments of the matrix, which is known as autoxidation of unsaturated fatty acids in oils and alkyd resins, was followed by Fourier transformed infrared spectroscopy, dynamic-mechanical analysis, positron annihilation lifetime spectroscopy and thermogravimetric analysis. As a result, values of the glass transition temperature, the storage moduli, tanδ and the free nanohole volumes were obtained. To study the influence of the aging process on the network structures at molecular level, the evolutions of the experimental parameters mentioned were followed for one year at two different aging conditions: room temperature and 50 °C. The chemical changes leading to nanostructural variations in all the studied samples are discussed in terms of the formed networks and the degradative processes during aging.

中文翻译：

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植物油热固性树脂的结构特性：交联剂、改性剂和氧化老化的影​​响

摘要 目前的工作重点是研究阳离子聚合植物油热固性树脂的配方对其老化行为的影响。为了这个目标，桐油基生物聚合物使用不同的共聚单体或添加改性剂来制备。具体而言，合成和天然共聚单体（苯乙烯、二乙烯基苯和桐油甲酯）和改性剂（丙烯酸化环氧化大豆油）用于制备不同的交联样品，桐油/共聚单体（或改性剂）的重量比固定为 70 /30。基质的脂肪酸链段遭受的化学老化，即油和醇酸树脂中不饱和脂肪酸的自氧化，随后进行了傅里叶变换红外光谱、动态机械分析、正电子湮没寿命光谱和热重分析。结果，获得了玻璃化转变温度、储能模量、tanδ和自由纳米孔体积的值。为了在分子水平上研究老化过程对网络结构的影响，在室温和 50°C 两种不同老化条件下对上述实验参数的演变进行了一年的跟踪。根据形成的网络和老化过程中的降解过程讨论了导致所有研究样品中纳米结构变化的化学变化。在室温和 50 °C 两种不同老化条件下，对上述实验参数的变化进行了一年的跟踪。根据形成的网络和老化过程中的降解过程讨论了导致所有研究样品中纳米结构变化的化学变化。在室温和 50 °C 两种不同老化条件下，对上述实验参数的变化进行了一年的跟踪。根据形成的网络和老化过程中的降解过程讨论了导致所有研究样品中纳米结构变化的化学变化。