Naslov
Surface functionalization of titanate nanotubes with aminosilane molecules

Autori
Huskić, Miroslav ; Brnardić, Ivan ; Umek, Polona ; Holjevac-Grgurić, Tamara

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Composites of nanotubes and polymers: joining theoretical modeling with experimental investigations: book of abstracts / - Ljubljana : Faculty of Mathematics and Physics, University of Ljubljana, 2011, O4-o4

Skup
4th COINAPO TOPICAL MEETING

Mjesto i datum
Ljubljana, Slovenija, 08.12.2011. - 09.12.2011

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Titanate nanotubes; aminosilane

Sažetak
The efficiency of filler on the physical, chemical and mechanical properties of the polymer depends on their distribution, filler/polymer surface interaction and size of filler. With the aim to improve those properties extensive research has been devoted to the field of functionalization of different filler types. In the last decade 1D nanostructured sodium titanates, (nanotubes (NaTiNT) and nanoribbons (NaTiNR)) have been the subject of extensive research due to their high surface area, semi-conducting and catalytic properties. According to our knowledge there are only few published articles regarding the functionalization of NaTiNT and preparation of polymer nanocomposites based on functionalized or non-functionalized NaTiNT and NaTiNR, which is the subject of our presentation. Silanes has long been used for surface modification of many fillers and nanofillers. Usually, the silanes are dissolved in a solvent, filler is added, than the mixture is heated for some time. After a certain reaction time the solvent is evaporated. Since the 3-functional silanes are usually used, there is a great possibility that filler is physically captured within the crosslinked silane network, not bound to it. The goal of our work was to obtain and characterize only surface modified titanate nanotubes. Functionalization of TiNT with 3-(aminopropyl)tri-ethoxysilane (APTES), was performed in two different ways ; with and without prehydrolization of APTES in ethanol. TiNT were functionalized with various amount of APTES (30, 60 and 100 wt% per nanotubes) and under different times of functionalization (2, 4 and 24h). The product was filtered and washed with ethanol. The assumption of nature and binding intensity of the functionalized nanoparticles were determined by simultaneous differential scanning calorimetry-thermogravimetric analysis, DSC-TGA, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM), equipped with electron dispersive X-ray spectrometry (EDS), mapping. DSC-TGA and SEM-EDS results showed successful modification of NaTiNT with APTES molecules performed in both ways Increasing the reaction time from 2 to 24 hours did not significantly increase the amount of bound silane, but pre-hydrolysis did.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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