Abstract The use of renewable resources and their derivatives provides a "green" approach to synthesizing UV-curable raw materials, and it possesses many advantages, such as environmental protection and energy conservation. Linseed oil has become a research hotspot because of its high content of double bonds and biodegradability. In this study, boron trifluoride diethyl ether was used as a catalyst to successfully introduce acrylic acid into the double bond of linseed oil long chain. Therefore, the UV-curable acrylated linseed oil prepolymers (ALO) were prepared in one step. The characterizations of 1H NMR and FT-IR were employed to verify the successful preparation of ALO. The viscosity of ALO was measured via rheological test, and it was turned out to be 803 mPa·s, indicating the prepolymers had a good processing property. The synthesis mechanism of ALO catalyzed by boron trifluoride diethyl ether was also proposed. Furthermore, different kinds of UV-curable films were prepared by mixing ALO with polyurethane acrylate resin (PUA-2665), trimethylolpropane triacrylate (TMPTA), and photoinitiator (PI-1173). As for the cured films, their thermal stability was investigated by thermogravimetric analysis (TGA), the dynamical mechanical properties were probed via dynamic mechanical analysis (DMA), and the mechanical properties were measured by tensile test. It was found that increasing TMPTA content promoted crosslinking density, leading to the improvement in thermal stability, storage modulus, and tensile strength of the cured films. Besides, they also exhibited excellent hardness, strong adhesion, and outstanding water (solvents) resistance on wood surface. Therefore, this study provides a novel one-step approach for the synthesis of UV-curable materials from vegetable oils, and the as-prepared high-performance films have potential for broad applications.

中文翻译：

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新型可再生多功能亚麻油基丙烯酸酯预聚物的一步合成及其在紫外光固化涂料中的应用

摘要 利用可再生资源及其衍生物为合成紫外光固化原料提供了一种“绿色”途径，具有环保、节能等诸多优势。亚麻籽油因其双键含量高和可生物降解性而成为研究热点。本研究以三氟化硼乙醚为催化剂，成功地将丙烯酸引入亚麻籽油长链的双键中。因此，紫外光固化丙烯酸酯化亚麻籽油预聚物 (ALO) 是一步制备的。1H NMR和FT-IR的表征被用来验证ALO的成功制备。通过流变测试测得ALO的粘度为803 mPa·s，表明该预聚物具有良好的加工性能。还提出了三氟化硼乙醚催化合成ALO的机理。此外，通过将 ALO 与聚氨酯丙烯酸酯树脂 (PUA-2665)、三羟甲基丙烷三丙烯酸酯 (TMPTA) 和光引发剂 (PI-1173) 混合制备了不同种类的紫外线固化薄膜。对于固化膜，通过热重分析（TGA）研究其热稳定性，通过动态力学分析（DMA）探测动态力学性能，并通过拉伸试验测量力学性能。结果表明，增加 TMPTA 含量会促进交联密度，从而提高固化膜的热稳定性、储能模量和拉伸强度。此外，它们还表现出优异的硬度、强附着力和出色的木材表面抗水（溶剂）性能。所以，