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  • 1 Department of Physical and Chemical Methodologies for Engineering, University of Catania, V.le A. Doria, 6, 95125, Catania, Italy
  • | 2 Department of Industrial and Mechanical Engineering, University of Catania, V.le A. Doria, 6, 95125, Catania, Italy
  • | 3 Department of Pharmaceutical Sciences, University of Catania, V.le A. Doria 6, 95125, Catania, Italy
  • | 4 Department of Chemical Sciences, University of Catania, V.le A. Doria, 6, 95125, Catania, Italy
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Abstract

Seven variously substituted derivatives of polyhedral oligomeric silsesquioxanes (POSSs) with general formula R7R′1 (SiO1.5)8, where R- and R′- were a cyclopentyl and a substituted phenyl group, respectively, were prepared in this study, and their compositions were checked by elemental analysis, 1H NMR and 13C NMR spectroscopy. The compounds obtained were studied by TG and DTA techniques, in both flowing nitrogen and static air atmospheres, to draw useful information about their resistance to thermal degradation. Experiments, performed in the 35–700 °C temperature range, showed different behaviours between the two used atmospheres. The formation of volatile compounds only, with a near-complete mass loss, was observed under nitrogen; by contrast, in oxidative environment, a solid residue (≈50% in every case) was obtained because of the formation of SiO2 as indicated by the FTIR spectra performed. The results obtained for the various compounds investigated were discussed and compared with each other, and heat resistance classifications in the studied environments were made.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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