Thermal analysis of hybrid materials prepared by gamma-irradiation


Hybrid materials were prepared by gamma-irradiation of a mixture of polydimethylsiloxane (PDMS), with tetraethylorthosilicate (TEOS) and zirconium propoxide (PrZr), using a (60)Co gamma source, without any addition of solvents. Thermogravimetry, differential scanning calorimetry and X-ray diffraction measurements showed that the obtained hybrids are amorphous materials of the nanocomposite type. The results highlighted the different influence of each of the metallic alkoxides on the hybrid structure. The material rupture temperature, associated with the degradation of the organic component, depends mainly on the TEOS content, whereas the inorganic component structural stability depends on the relative PrZr content in the alkoxides mixture.




Thermodynamics; Chemistry


Gomes, SR; Margaca, FMA; Ferreira, LM; Salvado, IMM; Falcao, AN

nossos autores


The authors wish to acknowledge support from the Portuguese Foundation for Science and Technology, FCT, in the framework of project POCTI/CTM/44150/2002.

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