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Confinement Fluorescence Effect: Polymer Crystalline Structure Visualization by an Aggregation-Induced Emission Luminogen
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  • Lan Zhou,
  • Linlin Zheng,
  • Xiaoxiao Yu,
  • Mengyue Gao,
  • Chengjian Xu,
  • Yifan Ge,
  • Tianxiang Bai,
  • Jin Wen,
  • Yanhua Cheng,
  • Meifang Zhu
Lan Zhou
Donghua University - Songjiang Campus
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Linlin Zheng
Donghua University - Songjiang Campus
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Xiaoxiao Yu
Donghua University - Songjiang Campus
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Mengyue Gao
Donghua University - Songjiang Campus
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Chengjian Xu
Donghua University - Songjiang Campus
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Yifan Ge
Donghua University - Songjiang Campus
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Tianxiang Bai
Donghua University - Songjiang Campus
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Jin Wen
Donghua University - Songjiang Campus
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Yanhua Cheng
Donghua University - Songjiang Campus

Corresponding Author:cyh@dhu.edu.cn

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Meifang Zhu
Donghua University - Songjiang Campus
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Abstract

Direct visualization of polymer crystalline structure remains challenging due to the lack of contrast across different microphases of polymers. Here we address this conundrum using an aggregation-induced emission luminogen (AIEgen) with confinement fluorescence effect, which could be used as a “built-in” sensor to label different crystalline phases. Computational simulations reveal that the confined space induces the AIEgens to take a more planar conformation, resulting in a red-shifted emission spectrum. With this property, the information of various polymer crystalline forms is converted into different fluorescence colors, which is attributed to the different spatial dimensions of the polymer amorphous layer between lamellar crystals where the AIEgens are located. Finally, polymer crystalline phases distinction, quantitative crystallinity determination, and stereocomplex crystals visualization are achieved, providing a relationship between crystalline microstructure and fluorescence signals. This work demonstrates the potential of AIE fluorescence technology in polymer science, providing a theoretical and experimental guideline for the materials processing and optimization of mechanical performance.
19 Jan 2023Submitted to Aggregate
19 Jan 2023Assigned to Editor
19 Jan 2023Submission Checks Completed
21 Jan 2023Reviewer(s) Assigned