Photochromic polysiloxanes substituted with 1,2-bis(2-methylbenzo[b] thiophene-3-yl)hexafluorocyclopentene

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Abstract

Photochromic diarylethene polymers (DPs) in which 1,2-bis(2-methylbenzo[b] thiophene-3-yl)hexafluorocyclopentene (BTF6) were covalently grafted onto the polymer main chain as pendant photochromic units were newly synthesized and their photochromic properties were investigated using steady-state and picosecond time-resolved spectroscopies. Polysiloxanes substituted with BTF6 molecules were prepared by sol-gel process using a mixture of tetraethoxysilane (TEOS), a silylated BTF6, and an organically modified silane precursor in the presence of HCl. The polysiloxane film (DP1) prepared from ω-methoxy poly(ethylene glycol) 3-(triethoxysilyl) propylcarbamate (MPGSC) as the silane precursor showed a much lower glass transition temperature than that (DP2) from heptadecafluorodecyltrimethoxysilane (HDFTMS). The ring-closure quantum yields of DP1 and DP2 were determined to be 0.20 and 0.02, respectively. Such a large difference in the quantum yield was attributed to the polymer matrix environment of the free inner volume.

Original languageEnglish
Pages (from-to)321-326
Number of pages6
JournalMacromolecular Research
Volume13
Issue number4
DOIs
Publication statusPublished - 2005 Aug

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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