AIE macro-molecule crystallinity fluorescence visualization method

A crystallinity and polymer technology, which is applied in the application field of aggregation-induced luminescent molecules in the fluorescence visualization of polymer crystallinity, which can solve the problems of uncertainty, inhomogeneity, and hindering the precise control of polymorphism in large-area molecular systems.

Pending Publication Date: 2020-12-18
THE HONG KONG UNIV OF SCI & TECH
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Problems solved by technology

Experiments to control different polymorphisms are often performed in bulk solution and driven by self-organization processes,

Method used

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  • AIE macro-molecule crystallinity fluorescence visualization method
  • AIE macro-molecule crystallinity fluorescence visualization method
  • AIE macro-molecule crystallinity fluorescence visualization method

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Embodiment Construction

[0012] In this application, a highly twisted AIE luminescent agent TPE-EP with a D–A structure is used. TPE-EP consists of three groups: hydrophobic TPE as electron donor unit, hydrophilic pyridinium salt group as electron acceptor unit, double bond as spacer unit ( figure 1 a). We preliminarily studied the polymorphic forms of TPE-EP prepared in bulk solution to understand the relationship between its photophysical behavior and structural arrangement. By controlling the precipitation conditions, three crystal forms (G, Y and O) can be obtained. figure 1 b shows photographs of G-crystals, Y-crystals and O-crystals taken under a fluorescence microscope. The green photoluminescence of G-crystals was observed under ultraviolet excitation (405nm), the maximum luminous wavelength was 507nm, and the quantum yield (Φ F ) is 0.21 and the lifetime is 2.1ns ( figure 1 c, green solid line). The crystal structure of G was analyzed by single crystal X-ray diffraction (XRD). G-crystal...

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Abstract

The invention relates to an AIE luminescent compound and application thereof in the aspect of visual characterization of polymer crystal fluorescence. The polymer fluorescence visualization method comprises the following steps: synthesizing an aggregation-induced emission (AIE) luminophor; and dissolving the IE molecules and general polymer polylactic acid (PLLA) to form a mixture; PLLA with different crystallinity degrees is obtained through a solvent evaporation method; according to different aggregation modes of the AIE molecules in the macro-molecule crystallization area/amorphous area, different light emitting colors of the macro-molecule crystallization/amorphous area are obtained, and visualization of the macro-molecule crystallinity is achieved.

Description

technical field [0001] The invention belongs to the application of aggregation-induced luminescent molecules in the field of general macromolecules, in particular to the application of aggregation-induced luminescent molecules in the aspect of fluorescence visualization of polymer crystallinity. Background technique [0002] Polycrystal is a ubiquitous phenomenon in nature and industrial materials. It describes the ability of a substance to exist in multiple forms or crystal structures with different arrangements of the molecules but with the same chemical formula. Polymorphism is an important factor determining the functional properties of materials. For example, in natural minerals, the polymorphic forms of graphite and diamond exhibit different mechanical properties; in pharmaceuticals, the same drug with different polymorphic forms has a great influence on the dissolution rate and biological activity. In the field of optoelectronics, π-conjugated small molecules serve ...

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Application Information

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IPC IPC(8): C07D213/20C09K11/02C09K11/06G01N21/64C08K5/3432C08L67/04
CPCC07D213/20C09K11/06C09K11/025C08K5/3432G01N21/64C09K2211/1007C09K2211/1029G01N2021/6417C08L67/04
Inventor 唐本忠成艳华孔梦诗
Owner THE HONG KONG UNIV OF SCI & TECH
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