Title page for etd-0624113-232038


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URN etd-0624113-232038
Author Shih-Fan Chiang
Author's Email Address shifan323@hotmail.com
Statistics This thesis had been viewed 5340 times. Download 703 times.
Department Materials and Optoelectronic Science
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Mesoporous Materials Fabricated from Multiblock Copolymers as Templates
Date of Defense 2013-07-22
Page Count 81
Keyword
  • body-centered cubic (bcc)
  • Evaporation Induced Self-assembly (EISA)
  • mesoporous silica
  • phenolic resin
  • multiblock copolymer
  • Abstract ABCBA type amphiphilic multiblock copolymers, poly(ε-caprolactone)-b-poly(ethylene oxide)-b-poly(propyleneoxide)-b-poly(ethylene oxide)-b-poly(ε-caprolactone) (PCL-b-PEO-b-PPO-b-PEO-b-PCL), were synthesized through ring-opening polymerization. Mesoporous silicas have been successfully fabricated via evaporation-induced self-assembly (EISA) strategy. Structures of mesoporous silicas templated by Pluronic F127 would transform from cylinder to body-centered cubic (bcc) and finally to disordered sphere and the pore size becomes smaller obviously with increasing of TEOS-to-F127 weight ratios. The assembled structures of the molecular were like “m” shape. The PEO segments of PCL-F127-PCL folded outside, and the PCL segments and PPO segment aggregated inside. Because PPO segment is not hydrophobic enough, it has a weak interaction with silica area. Mesoporous silica samples templated from CL12EO106PO70EO106CL12 (CFC1) or CL45EO106PO70EO106CL45 (CFC2) behaved with less regular arrangement.
      When blending F127 triblock copolymer with Novolac-type phenolic resin, FT-IR spectroscopy revealed that the ether groups of the PEO block were stronger hydrogen-bond acceptors for the OH group of phenolic resin than the ether groups of the PPO block. Thermal curing resulted in the triblock copolymer being incorporated into the phenolic resin, forming a nanostructure through a mechanism involving reaction-induced microphase separation. This approach provided a variety of composition-dependent nanostructures, including disordered wormlike, body-center cubic spherical, disorder micelle. The mesoporous phenolic resins as long range order bcc structure were formed only when the phenolic content was 50 wt%.
    Advisory Committee
  • Ming Chen - chair
  • Chih-Feng Wang - co-chair
  • Yeo-Wan Chiang - co-chair
  • Shiao-Wei Kuo - advisor
  • Files
  • etd-0624113-232038.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2013-07-25

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