TITLE:
Preparation of Fluoroalkyl End-Capped Oligomers/Hexagonal Boron Nitride Nanocomposites Possessing No Weight Loss Behavior in Nanocomposites Even after Calcination at 800°C
AUTHORS:
Jittraporn Saengkaew, Takahumi Ogasawara, Katsumi Yamashita, Suwadee Kongparakul, Hideo Sawada
KEYWORDS:
Fluorinated Oligomer, Hexagonal Boron Nitride, Nanocomposite, Thermal Stability, No Weight Loss, Calcination, Surface Modification, Oleophobicity, Fluorecence Spectra, PMMA
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.9 No.2,
March
14,
2019
ABSTRACT: Fluoroalkyl
end-capped acrylic acid oligomer [RF-(ACA)n-RF]/hexagonal boron nitride (h-BN)
nanocomposites [RF-(ACA)n-RF/h-BN]
were prepared by reaction of the corresponding oligomer with h-BN nanoparticles
(mean diameter: 50 nm) under non-catalytic or alkaline conditions,
respectively. Fluoroalkyl end-capped N,N-dimethylacrylamide
oligomer/h-BN nanocomposites [RF-(DMAA)n-RF/h-BN] were also obtained under similar
conditions. It was demonstrated that RF-(ACA)n-RF/h-BN
nanocomposites, which were prepared under alkaline conditions, afforded a clear weight loss in
proportion to the contents of the oligomer in the composites after calcination
at 800°C; however, the non-catalytic conditions enabled the RF-(ACA)n-RF/h-BN
nanocomposite to give no weight loss behavior corresponding to the contents of
the oligomer even after calcination. In fact, it was demonstrated that the RF-(ACA)n-RF/h-BN
nanocomposites possessing a clear weight loss property could afford the fluorescent
peak around 370 nm related to h-BN in the composites; however, the same fluorescent
intensity of this nanocomposite after calcination at 800°C as that of the
original h-BN was observed, indicating that this nanocomposite could give a clear weigh loss
behavior corresponding to the content of the oligomer during the calcination
process. In contrast, the RF-(ACA)n-RF/h-BN nanocomposites possessing no weigh
loss behavior were found to exhibit the similar fluorescent intensity before
and even after calcination at 800°C, suggesting that the corresponding nanocomposites
could provide no weight loss ability corresponding to the contents of the oligomer in the composites even after
calcination. Similarly, RF-(DMAA)n-RF/h-BN
nanocomposites, which were prepared under non-catalytic or alkaline conditions, were found to provide
no weight loss corresponding to the contents of the oligomer even after
calcination, respectively. These fluorinated h-BN nanocomposites were applied
to the surface modification of PMMA [poly(methyl methacrylate)] to exhibit an
oleophobic property on the modified PMMA surface. RF-(ACA)n-RF/h-BN
nanocomposites possessing a clear weight loss behavior, whose composites were
calcinated at 800°C, afforded not oleophobic but oleophilic property on the
modified PMMA surface, quite similar to that of the pristine PMMA film surface;
however, more interestingly, we found that RF-(ACA)n-RF/ and RF-(DMAA)n-RF/h-BN nanocomposites possessing no
weight loss characteristic, whose composites were calcined at 800°C, could supply a good oleophobic
property related to the fluoroalkyl segments in the composites on the modified
PMMA surfaces, respectively.