TY - JOUR
T1 - Modification of TiO2 nanotubes with 3-aminopropyl triethoxysilane and its performances in nanocomposite coatings
AU - Duong, Hong Phan
AU - Hung, Chia Hsiang
AU - Dao, Hung Cuong
AU - Le, Minh Duc
AU - Chen, Chia Yun
N1 - Funding Information:
This research was funded by the University of DaNang, University of Science and Technology (T2018-02-31) and Ministry of Science and Technology of Taiwan (MOST 106-2221-E-006-240-). The authors would like to thank the Center for Micro/Nano Science and Technology, National Cheng Kung University, Taiwan for providing the facilities for material characterizations.
Publisher Copyright:
© 2018 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
PY - 2018
Y1 - 2018
N2 - Until now, mono-dispersion of nanofillers, such as TiO2 nanotubes, in a polymer matrix remained a major challenge in the preparation of polymer nanocomposites. To improve the dispersion capability of TiO2 nanofillers in the epoxy matrix, the surfaces of TiO2 nanotubes were successfully modified with 3-aminopropyl triethoxysilane (APTS) by a facile aqueous process. The weight loss of APTS-grafted TiO2 nanotubes could be attributed to three main contributions: dehydration of adsorbed water, physical adsorption of APTS and thermal decomposition of APTS chains. In addition, transmission electron microscopy (TEM) images of APTS-grafted TiO2 nanotubes further evidenced a tubular shape with no destruction before and after grafting treatment. Furthermore, the APTS-grafted TiO2 nanotubes were used as the white pigment for preparing the epoxy-based coatings. It was found that the amine group on nanotube surfaces, which mediated as a curing agent, coordinated with the epoxy group through covalent bonding, thus allowing improved composite formation between the nanotubes and the epoxy matrix. The effects of APTS-grafted TiO2 nanotubes on the mechanical, thermal and corrosion resistances of epoxy coatings were examined. From detailed mechanical characterizations, it was revealed that the performances of pull-off adhesion, impact resistance and bending resistance of the APTS-grafted TiO2 nanotubes/epoxy coatings were greatly improved compared with the unmodified TiO2-based coating with the same 5% additive content. In addition, the resulting thermal properties and corrosion resistances of the epoxy resin were significantly improved due to the enhanced reinforcement of APTS-grafted TiO2 nanotubes within the epoxy matrix.
AB - Until now, mono-dispersion of nanofillers, such as TiO2 nanotubes, in a polymer matrix remained a major challenge in the preparation of polymer nanocomposites. To improve the dispersion capability of TiO2 nanofillers in the epoxy matrix, the surfaces of TiO2 nanotubes were successfully modified with 3-aminopropyl triethoxysilane (APTS) by a facile aqueous process. The weight loss of APTS-grafted TiO2 nanotubes could be attributed to three main contributions: dehydration of adsorbed water, physical adsorption of APTS and thermal decomposition of APTS chains. In addition, transmission electron microscopy (TEM) images of APTS-grafted TiO2 nanotubes further evidenced a tubular shape with no destruction before and after grafting treatment. Furthermore, the APTS-grafted TiO2 nanotubes were used as the white pigment for preparing the epoxy-based coatings. It was found that the amine group on nanotube surfaces, which mediated as a curing agent, coordinated with the epoxy group through covalent bonding, thus allowing improved composite formation between the nanotubes and the epoxy matrix. The effects of APTS-grafted TiO2 nanotubes on the mechanical, thermal and corrosion resistances of epoxy coatings were examined. From detailed mechanical characterizations, it was revealed that the performances of pull-off adhesion, impact resistance and bending resistance of the APTS-grafted TiO2 nanotubes/epoxy coatings were greatly improved compared with the unmodified TiO2-based coating with the same 5% additive content. In addition, the resulting thermal properties and corrosion resistances of the epoxy resin were significantly improved due to the enhanced reinforcement of APTS-grafted TiO2 nanotubes within the epoxy matrix.
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U2 - 10.1039/c8nj00642c
DO - 10.1039/c8nj00642c
M3 - Article
AN - SCOPUS:85048007691
VL - 42
SP - 8745
EP - 8751
JO - New Journal of Chemistry
JF - New Journal of Chemistry
SN - 1144-0546
IS - 11
ER -