Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: composition impact on the properties

0563596 - ÚMCH 2023 RIV RS eng J - Journal Article
Pergal, M. V. - Ostojić, S. - Steinhart, Miloš - Stefanović, I. S. - Pezo, L. - Špírková, Milena
Nanocomposites made from thermoplastic linear poly(urethane-siloxane) and organoclay: composition impact on the properties.
Journal of the Serbian Chemical Society. Roč. 87, č. 10 (2022), s. 1203-1218. ISSN 0352-5139. E-ISSN 0352-5139
R&D Projects: GA ČR(CZ) GA18-03932S
Institutional support: RVO:61389013
Keywords : polyurethane * clay nanofiller * composition-dependent properties
OECD category: Polymer science
Impact factor: 1, year: 2022
Method of publishing: Open access
http://www.doiserbia.nb.rs/Article.aspx?ID=0352-51392200036P#.Y2ofj-SZPyQ

Thermoplastic poly(urethane-siloxane)/organoclay nanocomposites (TPU NCs) with different hard segment content (20–55 wt. %) were prepared by in situ polymerization in the presence of organically modified montmorillonite as a nanofiller (Cloisite 30B, 1 wt. %). Hydroxyl-terminated ethoxypropyl- poly(dimethylsiloxane) was used as soft segment, while 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol were the hard segment components. The study of the influence of the hard segment content on the functional properties of TPU NCs was performed by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), dynamic mechanical thermal analyses (DMTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), water contact angle and water absorption tests. The results revealed that TPU NCs with the increasing hard segment content exhibit higher values of degree of microphase separation, melting temperature of the hard segments, degree of crystallinity, storage modulus (except for TPU NC-55), but lower thermal stability and hydrophobicity. TPU NC films were hydrophobic and their free surface energy was in the range from 17.7 to 24.9 mJ m-2. This work highlights how the composition of TPU NCs would affect their functional properties and provide an additional composition intended for designing advanced TPU NC materials for special biomedical applications.
Permanent Link: https://hdl.handle.net/11104/0337205