Ver todas as palestras confirmadas
Presidente de Sessão: Daniela Becker/UDESC
Palestra 05
Hybrid organic - Inorganic silicon based polymers: the attractive combination of mechanical, thermal and chemical properties for enhanced materials
Silvia A. C. Abarca (UFSC)
http://lattes.cnpq.br/9603741951259577
Abstract:
Synthesis of hybrid organic-inorganic silicon-based polymers have been attracted a great interest due to the potential combination of the well-known mechanical properties of organic polymers with the attractive thermal stability and corrosion resistance of inorganic polymers. While organic polymers are formed by long carbon-carbon bonding chains with functional groups attached to them, inorganic silicon-based polymers are usually constituted of chains containing silicon in combination with elements such as nitrogen, oxygen or carbon, leading to very polar molecules, such as polysilazanes and polysiloxanes. Interesting applications for these hybrid organic-inorganic polymers include the increase of flame resistance in organic polymers obtaining a hybrid polymer with unique characteristics such as excellent thermal stability, low heat release rate, high heat resistance, slow burning rate without a flaming drip and limited release of toxic gases during thermal decomposition by the incorporation of quantities of polysilazane on polystyrene matrix by radical polymerization reaction. In coatings, paints and adhesives, acrylate polymers, especially PMMA, synthesized with inorganic silicon-based polymer can be a suitable way to enhance the thermal stability and corrosion resistance of the PMMA. Another way to obtain hybrid polymers is by physical mixture of organic and inorganic polymers in different proportions, where hybrid blends with tailored properties can be prepared. A great challenge in the production of this type of blends is to avoid phase separation and blend inhomogeneity. This is a consequence of their very different polarity and functional groups, responsible for their distinct chemical and thermal properties. However these properties are the key to produce materials where the versatility of organic polymers can be combined with the ability of inorganic polymers to be converted in ceramics.
Palestra dia 05/11 das 15:30h às 16:00h sala 4
