Title page for etd-0713118-141648


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URN etd-0713118-141648
Author Shih-Ting Wang
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title KOH-activated porous carbon materials: Properties and applications
Date of Defense 2018-07-18
Page Count 132
Keyword
  • cyanate ester thermal cyclotrimerization
  • Cyanate esters
  • flexible capacitors
  • contaminant adsorption
  • KOH-activation, carbon dioxide capture
  • Friedel-Crafts alkylation reaction
  • Polycyanurate porous carbon material
  • hypercrosslinked porous polymer
  • Abstract In this experiment, two types of porous carbon materials were synthesized. The first type was to synthesize new cyanate ester compounds (bisphenol A, 1,1-bi-2-naphthol and phenolic novolac resin) by reacting a hydroxyl group with cyanogen bromide, and then via thermal cyclotrimerization form polycyanurate networks, the second type is the synthesis of a hypercrosslinked porous polymer with bisphenol A as the basic structural unit through the Friedel-Crafts alkylation reaction, and then the samples with the KOH chemical activation reaction was performed to prepare a porous carbon material. The porous carbon materials are used as a solid adsorbent to effectively remove carbon dioxide, solvent contaminants and as electrode materials of flexible supercapacitors.
    At high temperature, the thermal cyclotrimerization of the cyanate esters functional group form polycyanurate with good thermal stability. Bisphenol A through the Friedel-Crafts alkylation reaction form hypercrosslinked porous polymer, the crosslinked structure enhances its thermal stability. Both can be activated by potassium hydroxide at high temperatures to enhance pore properties.
    Further investigation of porous carbon materials using a specific surface area analyzer (BET). a-BPAC, a-BNC and a-PFC showed specific surface areas 1136, 1080 and 1645 m2 g-1, respectively. The HBPA-700 had the highest specific surface areas is 2340.7 m2g-1 because its high-temperature calcination at 700°C to increase its pore content. The obtained porous carbon materials can effectively capture carbon dioxide and adsorb pollutants in the solution. We also use HBPA-700 as an electrode material to manufacture flexible capacitors. Capacitors can be cut and healed 10 times without external stimuli and quickly restore their capacitive performance. Interestingly, capacitors can withstand various physical deformations while still maintaining their capacitive performance.
    Advisory Committee
  • Shiao-Wei Kuo - chair
  • Lieh-Li Lin - co-chair
  • Chih-Feng Wang - co-chair
  • Yeo-Wan Chiang - co-chair
  • Jin-Long Hong - advisor
  • Files
  • etd-0713118-141648.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2018-08-13

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