In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

Abstract

ABSTRACT:In this study, tetra isopropyl ortho titanate (TTIP) and polycaprolactone (PCL) were chosen as the ceramic precursor and the continuous phase, respectively, for the preparation of novel nanocomposites by using an in situ sol-gel process. In addition, acrylic acid grafted polycaprolactone (PCL-g-AA) was investigated as an alternative to PCL. The hybrids (PCL/TiO 2 and PCL-g-AA/TiO 2 ) were characterized via Fourier transform infrared (FTIR) spectroscopy, dynamic mechanical thermal analysis (DMA), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), and Instron mechanical testing. It was found that the carboxylic acid groups of acrylic acid acted as coordination sites for the titania phase to form chemical bonds, thus improving the properties of the acrylic acid grafted composite compared with its acrylicacid-free counterpart. The TiO 2 content also determined the strength of interfacial bonding between the polymer chains and the ceramic phase, as shown by changes in glass transition temperature (T g ) with TiO 2 content. The maximum values of tensile strength and T g were obtained with the PCL-g-AA/TiO 2 composite at 10 wt % TiO 2 . At TiO 2 contents above this, excess particles led to segregation between the organic and inorganic phases.

Influence of Poly (Titanium Oxide) on the Kinetic of the Formation, Viscoelastic and Optical Properties of the Interpenetrating Polymer Networks

“…The reduction of the intensity of the relaxation maximum with the increasing content of the inorganic component is often observed for the nanostructured hybrid systems. It is usually connected with the formation of the dense inorganic network that prevents the segmental mobility of the polymer chains [22,23]. Apparently, during the formation of organicinorganic systems (PU/PHEMA/(-TiO2-)n) both the formation of grafts [24] and the complex compounds can occur [25].…”

Synthesis of TiO2 and SiO2 Oxide Systems, Containing Nanoparticles of Palladium and Platinum

“…Presence of metallic nanoparticles formed of platinum group metals in oxide systems based on titanium dioxide, often leads to increased catalytic activity [8][9][10][11][12] . Despite the fact that the production of titanium dioxide is a wellresearched and widely practiced process, are of great interest for new approaches to the production of materials based on titanium dioxide, containing platinum metals.…”

“…For oxide systems based on titanium dioxide and platinum metals nanoparticles was used method, based on the interaction of organic precursor containing titanium and platinum metals at elevated temperatures in organic solvents to form an intermediate organic-inorganic composite 1,2,[9][10][11][12][13][14][15] . It is found that the reaction of titanium compounds, such as halides and alkoxides oxacycloundecane and 1,9-decandiene are found, the formation of these products may be associated with intramolecular dehydration, accompanied by the evolution of titanium dioxide.…”

Hyperbranched Polymer/TiO2 Hybrid Nanoparticles Synthesized via an In Situ Sol‐Gel Process

“…In particular, polymers combined with metal oxides nanoparticles can, as reported in the literature, lead to composites characterized by improved chemical, thermal, optical, electronic, and mechanical properties. [2][3][4][5][6][7] The incorporation of titanium oxide nanoparticles in thin films and coatings is especially encouraging since by this surface hardness can be significantly improved and, on the other hand, self-cleaning and antimicrobial properties can be introduced based on the photocatalytic effect induced by some titanium oxide modification.…”