Thermoplastic starch composites with TiO2 particles: preparation, morphology, rheology and mechanical properties

0473601 - ÚMCH 2018 RIV GB eng J - Journal Article
Ostafinska, Aleksandra - Mikešová, Jana - Krejčíková, Sabina - Nevoralová, Martina - Šturcová, Adriana - Zhigunov, Alexander - Michálková, Danuše - Šlouf, Miroslav
Thermoplastic starch composites with TiO2 particles: preparation, morphology, rheology and mechanical properties.
International Journal of Biological Macromolecules. Roč. 101, August (2017), s. 273-282. ISSN 0141-8130. E-ISSN 1879-0003
R&D Projects: GA ČR(CZ) GA14-17921S
Institutional support: RVO:61389013
Keywords : thermoplastic starch * titanium dioxide particles * morphology
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impact factor: 3.909, year: 2017

Composites of thermoplastic starch (TPS) with titanium dioxide particles (mTiO2, average size 0.1 mu m) with very homogeneous matrix and well-dispersed filler were prepared by a two-step method, including solution casting (SC) followed by melt mixing (MM). Light and scanning electron microscopy confirmed that only the two-step procedure (SC + MM) resulted in ideally homogeneous TPS/mTiO2 systems. The composites prepared by single-step MM contained non-plasticized starch granules and the composites prepared by single-step SC suffered from mTiO2 agglomeration. Dynamic mechanical measurements showed an increase modulus with increasing filler concentration. In TPS containing 3 wt.% of mTiO2 the stiffness was enhanced by >40%. Further experiments revealed that the recommended addition of chitosan or the exchange of mTiO2 for anisometric titanate nanotubes with high aspect ratio did not improve the properties of the composites.
Permanent Link: http://hdl.handle.net/11104/0270927