| Summary: | 博士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 101 === Layered materials have been incorporated into nanocomposite. With the microstructure of layered material and nanoparticles supported each other, the nanocomposite has performed an unusual increase in mechanical properties
For biphenyl (BP) liquid crystalline (LC) epoxy resin-based dental restorative materials, the partial melting of BP crystalline has observed during photopolymerization and the polymerization shrinkage has been efficiently reduced via the volume expansion resulted from this order-disorder transition. At high filler content, A nanoparticles embedded layers (NPEL) microstructure of the residual layered BP crystalline embedded by nanoparticles presents that contributes an increase in hardness and flexural modulus to the nanocomposite.
A superhydrophobic and oleophobic transparent nanocomposite has been fabricated via a 3-step process. First a silica/polyacrylate nanocomposite containing nano-sized aggregates has been made from tricyclodecane dimethanol diacrylate (TCDDA) and silica nanoparticles of different particle sizes. Then, the surface of nanocomposites has been treated with oxygen plasma to roughen the surface and expose the silica nanoparticles. Finally, the fluorosilane, 1H,1H,2H,2H-perfluorodecyl trimethoxysilane (PFDTTMES) has been grafted on the surface of oxygen plasma exposed silica nanoparticles by dip-coating. We have fabricated a superhydrophobic and oleophobic transparent nanocomposite and confirmed that sol-gel process is able to be conducted on the oxygen plasma exposed nanoparticle on the surface of nanocomposite.
Hafnium oxide and zirconium oxide films were deposited on the surface of nanocomposite using atomic layer deposition (ALD) process, respectively. The nanoparticles of nanocomposite were exposed by oxygen plasma treatment to create strong interaction between deposited metal oxide and nanocomposite, which should increase the mechanical properties of nanocomposite. The hafnium oxide was deposited commercial nanocomposite has performed the hardness higher than titanium and the improved flexural strength. Thus, ALD technologies has the potential to improve the mechanical properties of indirect dental restorative compsosite.
|
|---|
