Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Synthesis and Characterization of Fluorescent Supramolecular Polymers Bearing Pyrene Pendents with Different Spacer Length

스페이서 길이가 다른 파이렌 펜던트를 지닌 형광 초분자형 고분자의 합성과 특성 분석

  • Kim, Hee Jung (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Yoo, Young Jun (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Noh, Kyung Tak (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Chung, Jae Woo (Department of Organic Materials and Fiber Engineering, Soongsil University)
  • 김희정 (숭실대학교 유기신소재.파이버공학과) ;
  • 유영준 (숭실대학교 유기신소재.파이버공학과) ;
  • 노경탁 (숭실대학교 유기신소재.파이버공학과) ;
  • 정재우 (숭실대학교 유기신소재.파이버공학과)
  • Received : 2022.05.30
  • Accepted : 2022.06.25
  • Published : 2022.06.30
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Abstract

We synthesize ureido-pyrimidinone (UPy)-based semicrystalline supramolecular polymers bearing pyrene pendants (Py-UPCL) and investigate the pyrene spacer length effect on their supramolecular structure, optical, thermal, and mechanical properties. Nuclear magnetic resonance (NMR) spectroscopy, capillary viscometry, fluorescence spectroscopy, and differential scanning calorimetry (DSC) show that the supramolecular chain extension and crosslinking, i.e., the formation of supramolecular network structure, occurs in Py-UPCL by the UPy quadruple hydrogen bonding and the pyrene π-π interaction. In particular, the specific viscosities of Py-1-UPCL with shorter pyrene spacer is higher than Py-4-UPCL with longer pyrene spacer, and the excimer to monomer intensity ratio (IE/IM) of Py-1-UPCL (74.9) is higher than that of Py-4-UPCL (14.21), which indicates that shorter pyrene spacer length stronger formation of the supramolecular network structure. In addition, Py-4-UPCL (37.7 J g-1) has lower PCL melting enthalpy than Py-1-UPCL (53.5 J g-1) because of a bulky pyrene topology caused by longer spacer length. As a result, Py-4-UPCL exhibits two times lower strength and seven times smaller strain compared to Py-1-UPCL.

Keywords

Acknowledgement

본 연구는 연구재단 "기본연구지원사업(NRF-2016R1D1A1B01012377)"을 통해 수행되었음.

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