Article
  • Critical Fluorescence Enhancement of a Polydiphenylacetylene Derivative through Thermally Induced Phase Separation
  • Hyosang Park, Heesang Kim, and Giseop Kwak

  • School of Applied Chemical Engineering Major in Polymer Science and Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Deagu 41566, Korea

  • 열유도 상분리에 의한 폴리디페닐아세틸렌 유도체의 급격한 형광증대
  • 박효상 · 김희상 · 곽기섭

  • 경북대학교 응용화학공학부 고분자공학전공

  • Reproduction, stored in a retrieval system, or transmitted in any form of any part of this publication is permitted only by written permission from the Polymer Society of Korea.

Abstract

Phase change and fluorescence properties of the polydiphenylacetylene derivative, poly[1-phenyl-2-(p-trimethysilyl) phenylacetylene] (PTMSDPA), were investigated according to the thermally induced phase separation (TIPS) method. 1,4-dioxane was selected as the theta solvent from solvents having solubility parameters similar to that of the polymer, and the phase diagram of the solution of PTMSDPA/1,4-dioxane was derived using the cloud-point method. A critical point appeared at a concentration of 0.88×10-2 M and a temperature of 51.6 oC as the theta condition. During the cooling process, a significant fluorescence enhancement occurred near the critical point, because collision quenching and vibration relaxation in the polymer chain, which causes non-radiative emission decay, are restrained by the abrupt phase separation between the polymer and the solvent. This study provides a tentative method for producing highly fluorescent nanoparticles and microporous membranes by applying TIPS to fluorescent conjugated polymers.


열유도 상분리에 따른 폴리디페닐아세틸렌 유도체인 poly[1-phenyl-2-(p-trimethysilyl)phenylacetylene](PTMSDPA)의 상변화와 형광특성을 조사하였다. 폴리머와 비슷한 용해도상수를 가지는 용매들로부터 1,4-다이옥산이 theta solvent로 선정되었고, cloud-point법을 통해 PTMSDPA/1,4-다이옥산(1,4-dioxane) 용액의 phase diagram이 도출되었다. Theta condition으로 농도 0.88×10-2 M, 온도 51.6 oC에서 임계점이 나타났다. 냉각과정에서 임계점 부근에서 급격한 형광증대현상이 나타났으며, 이는 비방사성 형광 감쇠를 초래하는 폴리머 사슬 내의 충돌소광 및 진동완화가 폴리머와 용매사이의 급작스러운 상분리에 의해 억제되었기 때문이다. 본 연구는 형광공액고분자에 열유도 상분리법을 적용하여 초고형광성 나노입자 및 다공막을 제조할 수 있는 잠정적인 방법을 제시하고 있다.


Keywords: thermally induced phase separation, polydiphenylacetylene, phase diagram, theta solvent, fluorescence emission.

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2021; 45(4): 628-632

    Published online Jul 25, 2021

  • 10.7317/pk.2021.45.4.628
  • Received on Apr 14, 2021
  • Revised on May 6, 2021
  • Accepted on May 6, 2021

Correspondence to

  • Giseop Kwak
  • School of Applied Chemical Engineering Major in Polymer Science and Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-ku, Deagu 41566, Korea

  • E-mail: gkwak@knu.ac.kr