基于二苯甲酮衍生物的端羟基聚乳酸的双重发光性能

制备出2种含有单羟基的二苯甲酮类化合物:4-(2-羟乙基)(甲基)氨苯基]苯甲酮(NBP)与(4-氯苯基)4-(2-羟乙基)(甲基)氨基]苯甲酮(NBP-Cl),以此为引发剂引发D,L-丙交酯聚合制备不同分子量的聚乳酸(PLA),并对其进行结构表征和性能测试.光学测试结果表明,在室温条件下,NBP和NBP-Cl仅具有荧光发射性能,而PLA表现出荧光和室温磷光双重发光性能;重原子效应导致聚合物室温磷光增强,但磷光寿命减少;随着PLA分子量的减小,聚合物磷光寿命先增加后减少.PLA的热重分析数据显示其具有优异的热学性能,大大拓宽了该双重发光材料的应用范围.

Dual Light-emitting Properties of Hydroxyl-terminated Poly(lactic acid) Based on Benzophenone Derivatives?

Two kinds of benzophenone derivatives:( 4- ( 2-hydroxyethyl ) ( methyl ) amino ] phenyl ) benzophenone(NBP), (4-chlorophenyl)(4-(2-hydroxyethyl)(methyl)amino] benzophenone(NBP-Cl), and a series of hydroxyl-terminated polylactic acid( PLA) with different molecular weight were prepared based on D,L-lactide polymerization. The structures and properties of NBP, NBP-Cl and PLA were characterized. Optical test results showed that the NBP and NBP-Cl only had fluorescence emission property at room tempera-ture, however, PLA demonstrated fluorescence and phosphorescence dual light-emitting properties;the heavy atom effect enhanced the room temperature phosphorescence of PLA, but which decreased the phosphorescence lifetime;with the decrease of the molecular weight of PLA, the phosphorescence lifetime increased and then reduced. PLA thermal gravimetric analysis ( TGA ) data showed that this material had excellent thermal performance, which greatly broaden the applications of the dual light-emitting materials.