Title page for etd-0528116-114942


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URN etd-0528116-114942
Author Kuo-chih Hsu
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Bifunctional polybenzoxazine nanocomposites contain photo-crosslinkable coumarin units and pyrene units are capable of dispersing single-walled carbon nanotubes
Date of Defense 2016-06-16
Page Count 72
Keyword
  • π–π stacking
  • Glass transition temperature
  • Polybenzoxazine
  • Single-walled carbon nanotube
  • Pyrene
  • Abstract In this study, we have synthesized a new bifunctional benzoxazine monomer (Coumarin–Py BZ) possessing both coumarin and pyrene groups through the reaction of 4-methyl-7-hydroxycoumarin (coumarin–OH), paraformaldehyde, and amino-pyrene (Py–NH2) in 1,4-dioxane. Fourier transform infrared (FTIR) and 1H and 13C nuclear magnetic resonance spectroscopy confirmed the structure of this new coumarin–Py BZ monomer. We used differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and FTIR spectroscopy to monitor the curing behavior of coumarin–Py BZ to form poly (Coumarin–Py BZ), both before and after photodimerization of the coumarin moiety. DSC profiles revealed that the glass transition temperature of poly (Di-coumarin–Py BZ) was higher than that of its corresponding polymer, and consistent with an increase in crosslinking density after UV irradiation. The pyrene moiety of coumarin–Py BZ enhanced the dispersibility of single-walled carbon nanotubes (SWCNTs) in THF, leading to the formation of highly dispersible coumarin–Py BZ/SWCNT nanocomposites stabilized through π–π stacking between the pyrene and SWCNT units, as detected by Photoluminescence (PL). The combination of photo-crosslinkable coumarin groups and SWCNT nanohybrids enhanced the thermal stability, and char yield of the polybenzoxazine matrix, based on DSC and TGA analyses.
    Advisory Committee
  • Jin-Long Hong - chair
  • Yeo-Wan Chiang - co-chair
  • Yeong-Tarng Shieh - co-chair
  • Shiao-Wei Kuo - advisor
  • Files
  • etd-0528116-114942.pdf
  • Indicate in-campus at 0 year and off-campus access at 2 year.
    Date of Submission 2016-07-12

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