Korotkov Roman, Shutov Vyacheslav, Orlov Alexey, Bornosuz Natalia, Kulemza Daria, Onuchin Denis, Shcherbina Anna, Gorbunova Irina, Sirotin Igor
Faculty of Petrochemistry and Polymer Materials, Mendeleev University of Chemical Technology, Miusskaya Sq. 9, 125047 Moscow, Russia.
Polymer Competence Center Leoben GmbH, 8700 Leoben, Austria.
Polymers (Basel). 2024 Jan 31;16(3):392. doi: 10.3390/polym16030392.
An analysis of the influence of common modifiers on the kinetics of the curing process of epoxy-anhydride vitrimers was carried out. As common modifiers to enhance the "vitrimeric" nature of the material, zinc acetylacetonate as a transesterification catalyst and glycerol as a modifier of hydroxyl group content were chosen. The curing process of all obtained compositions was studied by differential scanning calorimetry (DSC) followed by the application of the isoconversional approach. It was shown that additives significantly affect the curing process. The resulting cured polymers were shown to be chemically recyclable by dissolution in the mixture of ethylene glycol and N-methylpirrolidone in a volume ratio of nine to one. The introduction of both zinc acethylacetonate and glycerol to the neat formulation led to a decrease in the dissolution time by 85.7% (from 35 h for the neat epoxy-anhydride formulation to 5 h for the modified formulation). In order to show the opportunity of the secondary use of recyclates, the mixtures based on the basic composition containing 10 wt. % of secondary polymers were also studied. The introduction of a recycled material to neat composition led to the same curing behavior as glycerol-containing systems.
对常见改性剂对环氧-酸酐类可塑交联聚合物固化过程动力学的影响进行了分析。作为增强材料“可塑交联聚合物”性质的常见改性剂，选择了乙酰丙酮锌作为酯交换催化剂，甘油作为羟基含量的改性剂。通过差示扫描量热法（DSC）对所有所得组合物的固化过程进行了研究，随后采用等转化率方法。结果表明，添加剂对固化过程有显著影响。所得固化聚合物通过溶解在体积比为9:1的乙二醇和N-甲基吡咯烷酮混合物中被证明是可化学回收的。将乙酰丙酮锌和甘油同时引入纯配方中，使溶解时间减少了85.7%（从纯环氧-酸酐配方的35小时降至改性配方的5小时）。为了展示回收物二次使用的可能性，还研究了基于含有10 wt.%二次聚合物的基本组合物的混合物。将回收材料引入纯组合物中导致与含甘油体系相同的固化行为。
