Influence of the organoclay content on the structure, morphology, and surface related properties of novel poly(dimethylsiloxane)-based polyurethane/organoclay nanocomposites

0474957 - ÚMCH 2018 RIV US eng J - Článek v odborném periodiku
Pergal, M. V. - Stefanović, I. S. - Poreba, Rafal - Steinhart, M. - Jovančić, P. - Ostojić, S. - Špírková, Milena
Influence of the organoclay content on the structure, morphology, and surface related properties of novel poly(dimethylsiloxane)-based polyurethane/organoclay nanocomposites.
Industrial and Engineering Chemistry Research. Roč. 56, č. 17 (2017), s. 4970-4983. ISSN 0888-5885
Grant CEP: GA ČR(CZ) GA13-06700S
Institucionální podpora: RVO:61389013
Klíčová slova: polyurethanes * elasticity * biodegradability
Obor OECD: Polymer science
Impakt faktor: 3.141, rok: 2017

Novel poly(dimethylsiloxane)-based polyurethane nanocomposites (TPU-NCs) were synthesized using in situ polymerization with the nanoclay Cloisite 30B. Differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis showed that TPU-NCs with an organoclay content of <=5 wt % exhibited increased thermal stability, storage modulus, and hard-segment melt temperatures but decreased degrees of crystallinity. TPU-NCs displayed increased surface hydrophilicity and enhanced surface free energy with increasing organoclay content. Small- and wide-angle X-ray scattering confirmed intercalated formations of organoclays in the nanocomposites. Individual clay particles on the surfaces of TPUs with lower organoclay loadings (1 or 3 wt %) or organoclay agglomerates in TPUs with higher amounts of organoclay (>=5 wt %) were detectable using scanning electron microscopy. The relatively smooth and homogeneous character of pure TPU and the distinctly heterogeneous and rough surfaces of TPU-NCs were detected via atomic force microscopy. Among the nanomaterials prepared, TPU-NCs with 1 wt % organoclay provided the best balance between the organoclay concentration and the functional properties desired in biomedical applications.
Trvalý link: http://hdl.handle.net/11104/0271866