Department of Chemistry, University of North Dakota, 151 Cornell Street Stop 9024, Grand Forks, ND 58202, USA.
Molecules. 2020 Sep 4;25(18):4044. doi: 10.3390/molecules25184044.
Ring opening copolymerization (ROCOP) of epoxides and cyclic anhydrides has become an attractive approach for the synthesis of biodegradable polyesters with various compositions. Encouraged by the efficiency and versatility of a series of amido-oxazolinate zinc complexes, in this study they were shown to be active catalysts for the synthesis of unsaturated polyesters via ROCOP of maleic anhydride and various epoxides. The relative activity of epoxides in these reactions was observed to be styrene oxide > cyclohexene oxide > phenyl glycidyl ether, which could be correlated with the electronic and steric features of the substrate. To provide more structural possibilities for the polyesters, the difference in epoxide reactivity was exploited in an attempt to prepare block terpolymers from one anhydride and two epoxides. Terpolymerization was carried out in one or two steps in a single pot. The thermal characterization by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques suggested that the resulting materials were mostly random terpolymers.
环氧化物和环状酸酐的开环共聚（ROCOP）已成为合成具有各种组成的可生物降解聚酯的一种有吸引力的方法。受一系列酰胺恶唑啉锌配合物的效率和多功能性的鼓舞，本研究表明它们是通过马来酸酐和各种环氧化物的 ROCOP 合成不饱和聚酯的有效催化剂。这些反应中环氧化物的相对活性为苯乙烯氧化物>环氧化环己烯>苯基缩水甘油醚，这可以与底物的电子和空间特征相关联。为了为聚酯提供更多的结构可能性，利用环氧化物反应性的差异试图从一种酸酐和两种环氧化物制备嵌段三元共聚物。在一锅法中一步或两步进行三元共聚合。通过热重分析（TGA）和差示扫描量热法（DSC）技术进行的热特性研究表明，所得材料主要是无规三元共聚物。
