| Summary: | 博士 === 國立中山大學 === 材料與光電科學學系研究所 === 104 === In this study, we focus on four major subjects which based on synthesis of high performance/photoresponsive polybenzoxazines containing azobenzene and coumarin units. As known Polybenzoxazines (PBZs) are class of thermosetting polymers which could be synthesized through thermally activated ring-opening polymerization of benzoxazine monomers in the absence of catalyst. In this study, we have successfully prepared benzoxazine monomers that features azobenzene, pyridine, coumarin, and pyrene units through the condensation reaction. The azobenzene, pyridine and coumarin units in the benzoxazine play the following roles: (i) allowing the photoisomerization between the planar trans and the nonplanar cis form for azobenzene units; formation the photodimerization of coumarin units through [2π+2π] cycloaddition and (ii) serving as catalyst to accelerate the ring-opening polymerization benzoxazine monomer to reduce the higher curing temperature. Then, we used the noncovalent interactions (such as, metal-ligand bonding mode, intermolecular hydrogen-bonding and π-π stacking interactions) between benzoxazine monomers and Zn(ClO4)2, MWCNTs and SWCNTs. Those hybrid materials exhibit higher thermal stability and glass transition temperatures (Tg) due to the increasing physical crosslinking density according to DSC, TGA, and DMA analyses, and well uniformly dispersed carbon nanotubes (CNTs) according to TEM images.
|
|---|
