白色荧光共聚酯PESC-b-PBTT的制备与性能

Preparation and Fluorescence Properties of PESC-b-PBTT White Fluorescent Copolyester

为了制备白色荧光高分子,通过熔融缩聚方法分别制备了发射蓝色荧光的聚(丁二酸乙二醇-co-丁二酸环己二甲醇酯)(PESC)和发射橙色荧光的、以四氯艹北酐修饰的聚(对苯二甲酸丁二醇-co-对苯二甲酸丙二醇酯)(PBTT)2种共聚酯,然后通过扩链反应将2种聚合物连接形成嵌段聚合物PESC-b-PBTT。利用核磁共振仪、荧光分光光度计等表征了共聚酯的化学结构和性能,并探讨了PESC和PBTT的比例对产物荧光性能的影响。结果表明,通过调控共聚酯中各嵌段的比例可以调控材料的荧光颜色,在PESC质量分数达到85%时,产物发射出了白色荧光。控制结晶温度可以改变共聚酯的结晶度和晶体尺寸,从而改变蓝光单元向橙光单元的能量传递,进而控制白色荧光由白色向冷白色过渡。

In order to prepare white fluorescent polymer materials,poly(ethylene succinate-co-cyclohexane dimethanol)(PESC)emitting blue fluorescence and poly(butylene terephthalate-co-propylene terephthalate)(PBTT)modified with 1,6,7,12-tetrachloroperylene tetracarboxylic acid dianhydride(TTAD)were prepared individually by melt polycondensation.Then the two polymers were linked to form a block polymer PESC-b-PBTT by chain extension reaction.The chemical structure,fluorescence emission and crystallization melting behavior of copolyesters were characterized by nuclear magnetic resonance(1H-NMR),fluorescence spectrophotometer and differential scanning calorimetry(DSC).The effects of the ratio of PESC and PBTT in PESC-b-PBTT on the fluorescence properties of the products were discussed.The results show that the fluorescence color of the materials can be controlled by adjusting the proportion of each block in the PESC-bPBTT copolymers.When the PESC mass fraction reaches 85%,the product emits white fluorescence which can be controlled by isothermal crystallization.Attributed to the increase of crystallinity and crystal size caused by the rise of isothermal crystallization temperature,blocking the energy transfer of blue light unit to orange light unit,the fluorescence of the sample turns to cold white gradually.