Characteristics and Morphology of Nanosilica Modified with Isopropyl Tri(dioctyl Phosphate) Titanate Coupling Agent.

Autor:	Minh HN; Institute of Chemistry and Material, 17 Hoang Sam Street, Cau Giay, Ha Noi, 100000, Vietnam., Chinh NT; Institute of Tropical Technology, Viet Nam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, 100000, Vietnam., Van TTT; Institute of Tropical Technology, Viet Nam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, 100000, Vietnam., Thang DX; Hanoi University of Industry, Minh Khai Commune, Tu Liem, Ha Noi, 100000, Vietnam., Hoang T; Institute of Tropical Technology, Viet Nam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, 100000, Vietnam.
Jazyk:	angličtina
Zdroj:	Journal of nanoscience and nanotechnology [J Nanosci Nanotechnol] 2018 May 01; Vol. 18 (5), pp. 3624-3630.
DOI:	10.1166/jnn.2018.14854
Abstrakt:	In order to improve dispersiveness of nanosilica in polymer matrix, surface organo-modification of nanosilica is necessary. This work reveals silica nanoparticles modified by titanate coupling agent isopropyltri (dioctylphosphate) titanate (KR12) in toluene solvent. Effect of reaction temperature, reaction time and reactant ratio on grafting efficiency have been studied by Thermogravimetric Analysis (TGA). The obtained results exhibit the grafted percentage of titanate coupling agent KR-12 on the surface of nanosilica increased quickly from 4.97 to 13.11 wt.% as increasing the content of KR-12 from 5 to 15 wt.% and raise slower from 13.21 to 13.43 wt.% as content of KR-12 in the range of 30 to 45 wt.%, respectively. The KR-12 content and grafting reaction time affect significantly on the grafting efficiency while temperature of grafting reaction is negative to the grafting efficiency. The results of analysis related to Infrared Spectroscopy and Energy-Dispersive X-ray spectroscopy (EDS) displayed titanate coupling agent KR-12 have been covalently bonded to surface of the nanosilica. The Transmission Electron Microscopy (TEM) images and size distribution indicated that after organic modification, nanosilica particles had average size about 86 nm and the agglomeration of nanoparticles decreased significantly. The obtained results showed that surface treatment of nanosilica with titanate coupling agent KR-12 was successful.
Databáze:	MEDLINE
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