One-pot preparation of surface-functionalized barium titanate nanoparticles for high-K polystyrene composite films prepared via floating method

0489883 - ÚMCH 2019 RIV US eng J - Journal Article
Piana, Francesco - Cacciotti, I. - Šlouf, Miroslav - Nanni, F. - Pfleger, Jiří
One-pot preparation of surface-functionalized barium titanate nanoparticles for high-K polystyrene composite films prepared via floating method.
Journal of Materials Science. Roč. 53, č. 16 (2018), s. 11343-11354. ISSN 0022-2461. E-ISSN 1573-4803
R&D Projects: GA ČR(CZ) GA17-03984S; GA MŠMT(CZ) LO1507
Institutional support: RVO:61389013
Keywords : barium titanate * polystyrene * surface modification
OECD category: Polymer science
Impact factor: 3.442, year: 2018

An advanced and inexpensive one-pot method to prepare polystyrene (PS)–barium titanate (BT) films by solution mixing is reported. The process was developed to obtain free-standing films with an increased dielectric constant (ε′). Since PS is soluble in apolar solvents, BT nanoparticles (BT-NPs) were surface-modified with palmitic acid (PAc) and embedded within the polymer matrix without affecting homogeneity and smoothness of the composite. The films were prepared by floating method consisting in dropping BT-NPs dispersed in PS/toluene solution on the water surface. After the evaporation of toluene, smooth, free-standing and thermally stable films were obtained with a markedly higher ε′ compared to the neat PS. PAc modification improved the dispersion of BT-NPs in the apolar phase and prevented their diffusion into the aqueous phase during the toluene evaporation. The proposed film-forming technique makes it possible to modulate the thickness and shape of the films by selecting the quantity and concentration of the organic phase and using various templates, thus opening up a broad range of applications.
Permanent Link: http://hdl.handle.net/11104/0284545