含希夫碱侧基聚酯及其锌配合物的合成和性能

经多步反应合成2种新型含希夫碱侧基聚酯(P5,P6),进一步与醋酸锌反应得到2种聚酯锌配合物(P5-Zn,P6-Zn)。 采用元素分析、FT-IR、UV-Vis、¹H NMR、GPC、TG、DSC和荧光光谱等技术手段对其结构和性能进行表征。 P5和P6均溶于四氢呋喃(THF)、氯仿(CHCl₃)、N,N-二甲基甲酰胺(DMF)、N,N-二甲基乙酰胺(DMAc)、二甲基亚砜(DMSO)、N-甲基吡咯烷酮法(NMP)等有机溶剂,P5-Zn和P6-Zn部分溶于THF及CHCl₃,溶于DMF、DMAc、DMSO、NMP等有机溶剂。 P5和P6的重均相对分子质量M_w及相对分子质量分布指数PDI分别为4164、6148 g/mol和1.42、1.43。 P5、P6、P5-Zn和P6-Zn的5%失重温度分别为339、348、367和358℃。 P5、P6、P5-Zn和P6-Zn的玻璃化转变温度T_g分别为88.8、123.3、39.8和63.8 ℃。 P5和P6的DMF溶液(5×10^-5 mol/L)在418和416 nm处发射弱紫色荧光,P5-Zn和P6-Zn的DMF溶液(5×10^-5 mol/L)在505和506 nm处发射强绿色荧光,固体P5-Zn和P6-Zn在527和532 nm处发射强绿色荧光。

Synthesis and Properties of Polyesters Containing Schiff Base Side Groups and Their Zinc Complexes

Two kinds of novel polyesters containing Schiff base side groups(P5, P6) were synthesized by multistep reactions. Subsequently, P5 and P6 reacted with zinc acetate to get zinc complexes(P5-Zn, P6-Zn). The structures and properties of polyesters and zinc complexes were characterized by elemental analysis, FT-IR, UV-Vis, ¹H NMR, GPC, TG, DSC and fluorescence spectroscopy. Polyesters P5 and P6 are soluble in tetrahydrofurane(THF), CHCl₃, N,N-dimethyl formamide(DMF), N,N-dimethyl acetamide(DMAc), dimethylsulfoxide(DMSO), and N-methyl pyrrolidone(NMP). Complexes P5-Zn and P6-Zn can be partly dissolved in THF and CHCl₃, and completely dissolved in DMF, DMAc, DMSO, and NMP. The M_w and PDI of P5 and P6 are 4164, 6148 g/mol and 1.42, 1.43, respectively. The 5% mass loss temperatures of P5, P6, P5-Zn and P6-Zn are 339, 348, 367 and 358 ℃, respectively. The T_g values of P5, P5-Zn, P6 and P6-Zn are 88.8, 123.3, 39.8 and 63.8 ℃, respectively. Fluorescence emission peaks of P5 and P6 in DMF solution appear at 418 and 416 nm, emitting weak purple light. Fluorescence emission peaks of P5-Zn and P6-Zn in DMF solution appear at 505 and 506 nm, emitting strong green light. Fluorescence emission peaks of P5-Zn and P6-Zn in solid state appear at 527 and 532 nm, emitting strong green light.