Spasojevic Pavle, Seslija Sanja, Markovic Maja, Pantic Olga, Antic Katarina, Spasojevic Milica
Faculty of Technical Sciences, University of Kragujevac, Svetog Save 65, 32000 Cacak, Serbia.
Institute of Chemistry, Technology and Metallurgy, Center of Excellence in Environmental Chemistry and Engineering, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia.
Polymers (Basel). 2021 Aug 10;13(16):2667. doi: 10.3390/polym13162667.
Nowadays, unsaturated polyester resins (UPR) are mainly obtained from non-renewable resources. The ever-increasing regulations and the continuous demand for more sustainability have led to extensive research towards more environmentally suitable alternatives to petroleum-based materials. However, one of the main disadvantages of bio-based UPR is their relatively high viscosity compared to petrochemical ones. In order to overcome this drawback, in this work, we investigated the possibility to lower the resin viscosity utilizing a mixture of dimethyl itaconate (DMI) and methyl methacrylate (MMA) as a reactive diluent. The effect of the DMI and MMA ratio on resin rheological properties was investigated. The optimal curing parameters were determined and all UPRs had a high gel content, which was shown to be dependent on the DMI and MMA ratio in the formulation. Furthermore, thermomechanical and mechanical properties of the resulting network were also found to be affected by the used reactive diluent mixture. A small substitution of DMI by MMA proved to be advantageous since it offers lower resin viscosity and improved mechanical properties.
如今，不饱和聚酯树脂（UPR）主要由不可再生资源制得。日益严格的法规以及对更高可持续性的持续需求，促使人们对更适合环境的石油基材料替代品展开广泛研究。然而，生物基UPR的主要缺点之一是，与石化基UPR相比，它们的粘度相对较高。为了克服这一缺点，在本研究中，我们研究了使用衣康酸二甲酯（DMI）和甲基丙烯酸甲酯（MMA）的混合物作为反应性稀释剂来降低树脂粘度的可能性。研究了DMI与MMA的比例对树脂流变性能的影响。确定了最佳固化参数，所有UPR均具有较高的凝胶含量，结果表明凝胶含量取决于配方中DMI与MMA的比例。此外，还发现所得网络的热机械性能和机械性能也受所用反应性稀释剂混合物的影响。事实证明，用MMA少量替代DMI是有利的，因为它能降低树脂粘度并改善机械性能。
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