The influence of bentonite and montmorillonite addition on thermal decomposition of novel polyurethane/organoclay nanocomposites
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 constit...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Society of Chemists and Technologists of Macedonia
2013-12-01
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| Series: | Macedonian Journal of Chemistry and Chemical Engineering |
| Subjects: | |
| Online Access: | https://mjcce.org.mk/index.php/MJCCE/article/view/442 |
| Summary: | 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. |
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| ISSN: | 1857-5552 1857-5625 |