TITLE:
Wettability Control between Oleophobic/Superhydrophilic and Superoleophilic/Superhydrophobic Characteristics on the Modified Surface Treated with Fluoroalkyl End-Capped Oligomers/Micro-Sized Polystyrene Particle Composites
AUTHORS:
Hideo Sawada, Koki Arakawa, Yuta Aomi
KEYWORDS:
Fluorinated Oligomeric Composite, Micro-Sized Polystyrene Particle, Surface Modification, Surface Wettability Change, Oleophobic/Superhydrophilic Property, Superoleophilic/Superhydrophobic Property
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.12 No.1,
January
20,
2022
ABSTRACT: Fluoroalkyl end-capped
vinyltrimethoxysilane-N,N-dimethylacrylamide
cooligomer [RF-(CH2-CHSi(OMe)3)x-(CH2-CHC(=O)NMe2)y-RF;
RF = CF(CF3)OC3F7: RF-(VM)x-(DMAA)y-RF]
was synthesized by reaction of fluoroalkanoyl peroxide [RF-C(=O)O-O(O=)C-RF]
with vinyltrimethoxysilane (VM) and N,N-dimethylacrylamide (DMAA). The modified glass surface treated with the cooligomeric nanoparticles [RF-(VM-SiO3/2)x-(DMAA)y-RF]
prepared under the sol-gel reaction of the cooligomer under alkaline conditions
was found to exhibit an oleophobic/superhydrophilic property, although the
corresponding fluorinated homooligomeric nanoparticles [RF-(VM-SiO3/2)n-RF] afforded an oleophobic/hydrophobic property on the modified
surface under similar conditions. RF-(VM-SiO3/2)n-RF/RF-(VM-SiO3/2)x-(DMAA)y-RF/PSt (micro-sized polystyrene particles)
composites, which were prepared by the sol-gel reactions of the
corresponding homooligomer and cooligomer in the presence of PSt particle under alkaline
conditions, provided an oleophobic/superhydrophilic property on the modified surface. However, it was demonstrated that the surface wettability on the modified surface
treated with the RF-(VM-SiO3/2)n-RF/RF-(VM-SiO3/2)x-(DMAA)y-RF/PSt composites changes dramatically from oleophobic/superhydrophilic to
superoleophilic/superhydrophilic and
superoleophilic/superhydrophobic characteristics, increasing with greater feed
ratios (mg/mg) of the RF-(VM)n-RF homooligomer
in homooligomer/cooligomer from 0 to 100 in the preparation of the
composites. Such controlled surfac