The influence of bentonite and montmorillonite addition on the thermal decomposition of novel polyurethane/organoclay nanocomposites

0424641 - ÚMCH 2014 RIV MK eng J - Journal Article
Pavličević, J. - Špírková, Milena - Bera, O. - Jovičić, M. - Mészáros Szécsényi, K. - Budinski-Simendic, J.
The influence of bentonite and montmorillonite addition on the thermal decomposition of novel polyurethane/organoclay nanocomposites.
Macedonian Journal of Chemistry and Chemical Engineering. Roč. 32, č. 2 (2013), s. 319-330. ISSN 1857-5552. E-ISSN 1857-5625
R&D Projects: GA ČR GAP108/10/0195
Institutional support: RVO:61389013
Keywords : polycarbonate-based polyurethane nanocomposites * layered silicates * DTG
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 0.310, year: 2013
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Polycarbonate-based polyurethane (PC-PUs) hybrid materials were obtained by the addition of organically modified bentonite and montmorillonite (1 w/w %). PC-PUs and their nanocomposites were prepared using prepolymerization with two polycarbonate diols (both of Mr ca 1000) differing in chain constitution, hexamethylene-diisocyanate and 1,4-butane diol (chain extender) as starting components. All samples contained the same hard-segment content (30 w/w %). Thermogravimetry coupled with differential scanning calorimetry (TG-DSC) was performed to obtain information about the organoclays addition on the thermal stability of the prepared polyurethane elastomers. The effect of bentonite and montmorillonite nanofillers on the decomposition pattern has been evaluated. By deconvolution of derivative thermogravimetric (DTG) curves, it has been found that the thermal decomposition of polyurethane samples takes place in three overlapping processes. Degradation kinetic parameters (activation energy and reaction order) were calculated on the basis of thermal data obtained at only one heating rate.
Permanent Link: http://hdl.handle.net/11104/0231689