Recyclable polyurethane/nanoclay films

0509155 - ÚMCH 2020 RIV US eng J - Journal Article
Špírková, Milena - Brožová, Libuše - Hodan, Jiří - Kredatusová, Jana - Krejčíková, Sabina - Zhigunov, Alexander - Pavličević, J.
Recyclable polyurethane/nanoclay films.
Polymer Composites. Roč. 40, č. 10 (2019), s. 4079-4092. ISSN 0272-8397. E-ISSN 1548-0569
R&D Projects: GA ČR(CZ) GA18-03932S
Institutional support: RVO:61389013
Keywords : waterborne polyurethane dispersion * nanoclay * nanocomposite
OECD category: Polymer science
Impact factor: 2.265, year: 2019
Method of publishing: Limited access
https://onlinelibrary.wiley.com/doi/full/10.1002/pc.25269

A series of polyurethane (PU)/clay nanocomposite films was prepared by adding natural bentonite Cloisite® Na+ powders to waterborne polyurethane dispersions (PUDs) followed by a slow water evaporation. The nanoclay content in the films varied from 0 to 5 wt%. The functional properties of materials with low nanoclay loading (up to 1 wt%) resemble features of films prepared without any nanoclay. Compared to unfilled PU, the films with 3 and 5 wt% nanoclay concentrations exhibited slightly deteriorated properties. This phenomenon can be caused by the fact that the polymer–filler interactions are negligible. Gas transport properties are the exception: nanoclay was found to be an efficient barrier component for the permeability of industrially important gases (O2, N2, H2, CO2, and CH4). All films feature thermoplastic characteristics and thermal stabilities up to at least 200°C. Because PUDs are solely composed of linear chains, the possibility of preparing recyclable materials was tested. While PU can be re‐used after dissolving in acetone and re‐dispersing in water, the re‐use of nanoclay is not recommended. Preliminary accelerated in vivo tests performed in 20% H2O2 and 0.1M CoCl2 at 37°C detected substantial susceptibility to biodegradation, especially for films containing 5 wt% nanoclay.
Permanent Link: http://hdl.handle.net/11104/0300296