A kind of PES-based flexible white fluorescent polyester and preparation method thereof

A blue fluorescent, HO-PES-OH technology, applied in the field of PES-based flexible white fluorescent polyester and its preparation, can solve the problems of color change of emitted light, poor miscibility, uneven fluorescence, etc.

Active Publication Date: 2021-05-11
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a PES-based flexible white fluorescent polyester to solve the uneven fluorescence and the color change of emitted light caused by the poor miscibility between fluorescent molecules and polymers in existing polymer blended white fluorescent materials. The problem

Method used

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  • A kind of PES-based flexible white fluorescent polyester and preparation method thereof
  • A kind of PES-based flexible white fluorescent polyester and preparation method thereof
  • A kind of PES-based flexible white fluorescent polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: Blue fluorescent donor unit PES- co - Preparation of TPE:

[0052] First, add 50g of HO-PES-OH prepolymer, 0.5g of bishydroxytetraphenylethylene (TPE-2OH), and 1.8g of TDI into the reactor under an inert gas environment. Next, raise the temperature until all the solids are melted, then lower the temperature to 160°C, and continue the reaction for 1~2h. Nitrogen protection discharge to get PES- co -TPE.

[0053] Synthetic PES- co -TPE copolyester products have the following properties: 1) Intrinsic viscosity [ŋ]=0.88 g / dL; 2) Under the excitation of 365nm ultraviolet light, the peak emission wavelength of strong blue fluorescence is 472nm; 3) The melting point is 99°C; 4 ) The absolute quantum yield of fluorescence at room temperature is 85.1%.

Embodiment 2

[0054] Example 2: Orange Fluorescent Acceptor Unit PES- co - Preparation of TPE:

[0055] Preparation of PTBT by a two-step melt polycondensation method- co -TDAT. First, add 19.4g of dimethyl terephthalate, 7.6g of propylene glycol, 9.0g of butanediol and 1.0g of tetrachloroperylene anhydride into the reactor, the catalyst is tetrabutyl titanate, the mass is 0.06g, and the inert gas environment . Next, raise the temperature until all the solids are melted, then gradually raise the temperature to 250°C, compress and polymerize under reduced pressure for 3 hours, and discharge the material under nitrogen protection to obtain PTBT- co -TDAT.

[0056] Synthetic PES- co -TPE copolyester products have the following properties: 1) Intrinsic viscosity [ŋ]=1.03 g / dL; 2) Under the excitation of 365nm ultraviolet light, the emission peak of strong orange fluorescence is 580nm; 3) The melting point is 154°C; 4) The absolute quantum yield of fluorescence at room temperature is 86.9%...

Embodiment 3

[0057] Embodiment 3: Preparation of white flexible blended polyester material

[0058] First, the above-prepared PES- co -TPE 10g and PTBT- co - Dissolve 0.8g of TDAT in dichloromethane, and then spin-dry using a rotary evaporator at 35°C; finally, fully mix the solid mixture through an extruder at 110~120°C to obtain PES- co -TPE / PTBT- co - TDAT blend.

[0059] The prepared blended polyester material has the following properties: 1) The appearance is orange-red; 2) It emits strong white fluorescence under the excitation of 365nm ultraviolet light; 3) At room temperature, the absolute quantum yield of fluorescence under the excitation of 340nm ultraviolet light is about 34.9% ;4) The 0.2mm film is flexible and bendable; 5) It has strong plasticity and can be made into many shapes; 6) It has two melting points, 99°C and 154°C.

[0060] Structural characterization: using the AvIII nuclear magnetic resonance spectrometer of Bruker, Switzerland, deuterated chloroform (CDCl 3 ...

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Abstract

The invention provides a PES-based flexible white fluorescent polyester and a preparation method thereof, which uses bio-based polybutylene with high brightness, high quantum yield, blue fluorescence emission, and a skeleton containing tetraphenylethylene (TPE) fluorescent units. Ethylene glycol diacid (PES‑ co ‑TPE) as a donor, with poly(trimethylene terephthalate‑terephthalate‑ co ‑Butylene terephthalate (PTBT‑ co ‑TDAT) as the acceptor, and the blend was prepared by melt blending the two. The PES-based flexible white fluorescent polyester of the invention has high quantum yield and brightness, and has potential application value.

Description

technical field [0001] The invention relates to a white fluorescent polyester and a preparation method thereof, in particular to a PES-based flexible white fluorescent polyester and a preparation method thereof. Background technique [0002] White organic fluorescent materials, especially flexible materials, have attracted extensive attention in recent years because of their broad application prospects in the fields of flat panel display, solid-state lighting, and backlight for full-color displays. Since the emission of white light requires an emission spectrum covering the entire visible region, it is difficult to achieve it with monochromatic phosphors. The donor-acceptor complex system (the color of the donor and the acceptor is complementary) is a common way to achieve white light. In most donor-acceptor complex systems, the externally provided excitation energy is transferred from the high-energy fluorescent molecule For low-energy fluorescent molecules, it provides a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/14C08L67/02C09K11/06C08G18/64C08G18/67C08G63/682C08G63/78
CPCC08G18/6453C08G18/675C08G63/6826C08G63/78C08L75/14C09K11/06C09K2211/1007C09K2211/1088C08L67/02
Inventor 闰明涛王建侯磊刘铮
Owner HEBEI UNIVERSITY
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