Chistyakov Evgeniy M, Filatov Sergey N, Sulyanova Elena A, Volkov Vladimir V
Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia.
Shubnikov Institute of Crystallography, Federal Scientific Research Centre "Crystallography and Photonics", Russian Academy of Sciences, 119333 Moscow, Russia.
Polymers (Basel). 2021 Dec 13;13(24):4356. doi: 10.3390/polym13244356.
A new method for purification of 2-methyl-2-oxazoline using citric acid was developed and living cationic ring-opening polymerization of 2-methyl-2-oxazoline was carried out. Polymerization was conducted in acetonitrile using benzyl chloride-boron trifluoride etherate initiating system. According to DSC data, the temperature range of melting of the crystalline phase of the resulting polymer was 95-180 °C. According to small-angle X-ray scattering and wide-angle X-ray diffraction data, the degree of crystallinity of the polymer was 12%. Upon cooling of the polymer melt, the polymer became amorphous. Using thermogravimetric analysis, it was found that the thermal destruction of poly(2-methyl-2-oxazoline) started above 209 °C.
开发了一种使用柠檬酸纯化2-甲基-2-恶唑啉的新方法，并进行了2-甲基-2-恶唑啉的活性阳离子开环聚合。聚合反应在乙腈中使用苄基氯-三氟化硼乙醚引发体系进行。根据DSC数据，所得聚合物结晶相的熔点温度范围为95-180°C。根据小角X射线散射和广角X射线衍射数据，该聚合物的结晶度为12%。聚合物熔体冷却后，聚合物变为非晶态。通过热重分析发现，聚（2-甲基-2-恶唑啉）的热分解在209°C以上开始。
