Superhydrophobic and Oleophobic Transparent Low Moisture Permeation Polyarylate/Silica Nanocomposite
Date Issued
2011
Date
2011
Author(s)
Chang, Yuan-Ling
Abstract
This research focused on the development of superhydrophobic oleophobic low moisture permeation transparent nanocomposite films. We utilized a three-step process to fabricate the films. The first step involved the synthesis of hybrid resins and fabrication of nanocomposite films. The resins contained a mixture of 20-30 nm and 70-100 nm SiO2 nanoparticles, tricyclodecane dimethanol diacrylate (TCDDA) and a photo-inititor (1-Hydroxy-cyclohexyl-phenyl-ketone, Irg184). The SiO2 nanoparticles were surface-modified by 3-(Trimethoxysilyl) propyl methacrylate (MPS) and then dispersed into TCDDA homogeneously with a 50 wt% of nanoparticles. Dense hybrid films of 60-200 μm were prepared by casting the resins on glass substrates or PET films and then photo-curing by 935.3 watts/m2 at a distance of 20 cm for one minute.
In the second step, we treated the nanocomposite films with an oxygen plasma treatment (6 × 10-1 torr, 18 watts) for fifteen minutes. Thus, the surfaces could be roughened and SiO2 nanoparticles on the surfaces could be exposed. Surface roughness was controlled by varying weight ratios of different-sized SiO2 in nanocomposites and the condition of oxygen plasma treatment.
The final step was to introduce a 1H,1H,2H,2H-perfluorodecyl trimethoxysilane (PFDTMES) coating onto the surfaces by dip-coating the oxygen plasma-treated films in a solution of 2 vol% of PFDTMES in ethanol. The wet nanocomposite films were
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then dried at 80℃ for one hour.
The best-performance nanocomposite film is made from the resin containing 40wt% 70-100 nm SiO2, 10 wt% 20-30 nm SiO2 and 50 wt% TCDDA. It exhibits both superhydrophobicity and highly oleophobicity with a water contact angle of 161° and an n-1-octadecene contact angle of 131°, respectively. It also has low moisture permeation of 1.44 g‧mm/m2‧day and good transparency of 80% at 400-800 nm for a 60 μm film. This novel nanocomposite film has potential applications in the encapsulation of optoelectronics and self-cleaning surfaces.
Subjects
superhydrophobicity
oleophobicity
nanocomposite
encapsulation
oxygen plasma
transparency
Type
thesis
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