Pan Xiao, Webster Dean C
Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108, USA.
Macromol Rapid Commun. 2011 Sep 1;32(17):1324-30. doi: 10.1002/marc.201100215. Epub 2011 Jun 20.
Highly functional biobased epoxy resins were prepared using dipentaerythritol (DPE), tripentaerythritol (TPE), and sucrose as core polyols that were substituted with epoxidized soybean oil fatty acids, and the impact of structure and functionality of the core polyol on the properties of the macromolecular resins and their epoxy-anhydride thermosets was explored. The chemical structures, functional groups, molecular weights, and compositions of epoxies were characterized using nuclear magnetic resonance (NMR) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, gel permeation chromatography (GPC), and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI MS). The epoxies were also studied for their bulk viscosity, intrinsic viscosity, and density. Crosslinked with dodecenyl succinic anhydride (DDSA), epoxy-anhydride thermosets were evaluated using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), tensile tests, and tests of coating properties. Epoxidized soybean oil (ESO) was used as a control. Overall, the sucrose-based thermosets exhibited the highest moduli, having the most rigid and ductile performance while maintaining the highest biobased content. DPE/TPE-based thermosets showed modestly better thermosetting performance than the control ESO thermoset.
使用二季戊四醇（DPE）、三季戊四醇（TPE）和蔗糖作为核心多元醇，用环氧化大豆油脂肪酸对其进行取代，制备了高功能性生物基环氧树脂，并探究了核心多元醇的结构和官能度对大分子树脂及其环氧-酸酐热固性材料性能的影响。使用核磁共振（NMR）光谱、傅里叶变换红外（FTIR）光谱、凝胶渗透色谱（GPC）和基质辅助激光解吸/电离飞行时间质谱（MALDI MS）对环氧树脂的化学结构、官能团、分子量和组成进行了表征。还研究了环氧树脂的本体粘度、特性粘度和密度。用十二烯基琥珀酸酐（DDSA）进行交联，使用差示扫描量热法（DSC）、动态力学分析（DMA）、拉伸试验和涂层性能测试对环氧-酸酐热固性材料进行了评估。以环氧化大豆油（ESO）作为对照。总体而言，基于蔗糖的热固性材料表现出最高的模量，具有最刚性和韧性的性能，同时保持了最高的生物基含量。基于DPE/TPE的热固性材料显示出比对照ESO热固性材料略好的热固性性能。
