Preparation and fluorescence properties of PESC-b-PBTT white fluorescent copolyester
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) are 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 are characterized by nuclear magnetic resonance (1H NMR), fluorescence spectrophotometer and differential scanning calorimetry (DSC). The effect of the ratio of PESC and PBTT in PESC- b -PBTT on the fluorescence properties of the products is discussed. The results shows that the fluorescence color of the material can be controlled by adjusting the proportion of each block in the PESC- b -PBTT copolymer. When the PESC’s content reaches 85wt%, 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 cool white gradually.
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