The development of low-carbon and environmentally friendly unsaturated polyester thermosets has attracted widespread attention. In this work, methacrylated castor oil (MCO) and methacrylated isosorbide (MI) were prepared using renewable castor oil and isosorbide by a simple and mild method. Subsequently, a variety of sustainable unsaturated polyester materials (MCO-MI) were prepared by curing MCO resin with the reactive diluent MI in different ratios via free radical polymerization. The chemical structure, viscosity, biobased carbon content, and LD₅₀ of MCO and MI were evaluated, and the mechanical properties, thermo-mechanical properties, solvent resistance, and life cycle assessment (LCA) of the cured MCO-MI thermosets were investigated. The results showed that MCO and MI exhibited low viscosity (746 and 4 mPa s), chemical toxicity, and high biobased carbon content (85.9 and 76.9%). When the mass ratio of MCO to MI was 40:60, the resulting MCO-MI thermosets had the optimum thermo-mechanical property with a T_g of 170.2 °C and a tensile strength of 35.6 MPa. In addition, the LCA results demonstrated that the MCO-MI thermosets had striking environmental benefits over traditional petroleum-based unsaturated polyester materials containing styrene. This work provides insight into the preparation of environmentally friendly and high-performance unsaturated polyester materials employing biobased building blocks.

中文翻译：

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来自蓖麻油和异山梨酯的生物基不饱和聚酯热固性材料及其生命周期评估


低碳环保型不饱和聚酯热固性材料的发展引起了广泛关注。在这项工作中，使用可再生蓖麻油和异山梨酯通过简单温和的方法制备甲基丙烯酸化蓖麻油 （MCO） 和甲基丙烯酸异山梨酯 （MI）。随后，通过自由基聚合将 MCO 树脂与活性稀释剂 MI 以不同比例固化，制备了多种可持续不饱和聚酯材料 （MCO-MI）。评估了 MCO 和 MI 的化学结构、粘度、生物基碳含量和 LD₅₀，并研究了固化 MCO-MI 热固性塑料的机械性能、热机械性能、耐溶剂性和生命周期评估 （LCA）。结果表明，MCO 和 MI 表现出低粘度 （746 和 4 mPa s）、化学毒性和高生物基碳含量 （85.9 和 76.9%）。当 MCO 与 MI 的质量比为 40：60 时，所得的 MCO-MI 热固性材料具有最佳的热机械性能，T_g 为 170.2 °C，拉伸强度为 35.6 MPa。此外，LCA 结果表明，MCO-MI 热固性材料比含有苯乙烯的传统石油基不饱和聚酯材料具有显着的环境效益。这项工作为采用生物基构建块制备环保和高性能的不饱和聚酯材料提供了见解。