Title page for etd-0801113-171617


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URN etd-0801113-171617
Author Wei-chen Su
Author's Email Address No Public.
Statistics This thesis had been viewed 5341 times. Download 326 times.
Department Materials and Optoelectronic Science
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The Application of Hydrogen Bonding in Polybenzoxazine Composites
Date of Defense 2013-07-22
Page Count 84
Keyword
  • Superhydrophobic surface
  • Polymer blends
  • Polybenzoxazines
  • Block copolymer
  • Hydrogen-bonding
  • Composite
  • Abstract In this experiment we figure out the reversible surface properties (hydrophilicity, hydrophobicity) of a polybenzoxazine (PBZ) thin film through simple application of alternating UV illumination and thermal treatment. The fraction of inter-molecularly hydrogen bonded O–H⋅⋅⋅O=C units in the PBZ film increased after UV exposure, inducing a hydrophilic surface; the surface recovered its hydrophobicity after heating, due to greater O–H⋅⋅⋅N intramolecular hydrogen bonding. Taking advantage of these phenomena, the PBZ/silica nanocomposite coating through were prepared via two simple steps; this material exhibited reversible transitions from superhydrophobicity to superhydrophilicity upon sequential UV irradiation and thermal treatment.
       And the second part of the experiment is related to the toughening effect on polymer composites of amphiphilic block copolymers, polybenzoxazine and epoxy blends. The polybenzoxazine resins have two drawbacks of hard and brittle. The polymer-blending method can be utilized to solve this problem. In order to improve the toughness properties of polybenzoxazine resin, we introduced the PEO-b-PCL diblock copolymer to the matrix which is a mixture of polybenzoxazine and epoxy. The glass transition temperature (Tg) of the blended materials decreased with the increasing ratio of PEO-b-PCL. In the mechanical analysis, it can obviously figure out that the storage modulus of PEO-b-PCL contained material decreased at least 1/3 times to an order than the original matrix. It is proven that the toughening phenomena in this polymer blending system exist.
    Advisory Committee
  • Ming Chen - chair
  • Chih-Feng Wang - co-chair
  • Yeo-Wan Chiang - co-chair
  • Shiao-Wei Kuo - advisor
  • Files
  • etd-0801113-171617.pdf
  • Indicate in-campus at 4 year and off-campus access at 4 year.
    Date of Submission 2013-09-01

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