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https://ri.ufs.br/jspui/handle/riufs/21406| Tipo de Documento: | Trabalhos em Eventos |
| Título: | Effect of PET on the crystallization of lithium/sodium acetate glasses studied by isothermal and non-isothermal kinetic methods |
| Autor(es): | Costa, Silvânio Silvério Lopes da Santos, Marcelo Leite dos Beltrão, Marcelo Augusto Neves Matos, Charlene Regina Santos Alcântara, Ana Clécia Santos de Gimenez, Iara de Fatima Alves, Oswaldo Luiz Barreto, Ledjane Silva |
| Data do documento: | 2010 |
| Resumo: | The kinetic parameters for the crystallization of CH3COOLi/CH3COONa glasses varying the Li:Na mole fraction LN21(2:1), LN31(3:1), LN41(4:1) and LN32(3:2) have been evaluated by isothermal and non-isothermal DSC measurements. Crystallization of LN21 samples containing variable amounts of poly(ethylene-terephthalate) (PET) has also been studied. Values of the Avrami exponent n varying between 2.05 and 2.33 were obtained from both isothermal and non-isothermal methods for all LN glasses, indicating a diffusioncontrolled crystal growth with a decreasing nucleation rate. The more pronounced effect of PET on glass crystallization has been observed for low polymer amounts, being interpreted as due to polymer miscibility with the glass, which is absent for high PET amounts. The value of n = 4.75 for LN21+PET (3%) suggests a change in the crystallization mechanism from diffusion-controlled to interface-controlled crystal growth. The apparent activation energy (E) decreased with increasing PET amount, evidencing an improvement in glass stability against crystallization. |
| Palavras-chave: | PET Crystallization Lithium acetate Sodium acetate |
| ISSN: | 1742-6596 1742-6588 |
| Parte de : | Journal of Physics: Conference Series |
| Idioma: | eng |
| Instituição/Editora: | IOP Publishing |
| Citação: | COSTA, S. S. L. et al. Effect of PET on the crystallization of lithium/sodium acetate glasses studied by isothermal and non-isothermal kinetic methods. Journal of Physics: Conference Series, v. 249, 2010. Trabalho apresentado no 16º International Conference on Defects in Insulating Materials, 2008, [Aracaju]. Disponível em: https://iopscience.iop.org/article/10.1088/1742-6596/249/1/012050/pdf. Acesso em: 21 mar. 2025. |
| Licença: | Creative Commons Atribuição 4.0 Internacional (CC BY 4.0) |
| URI: | https://ri.ufs.br/jspui/handle/riufs/21406 |
| Aparece nas coleções: | DQI - Artigos de periódicos DQI - Trabalhos apresentados em eventos |
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| Arquivo | Descrição | Tamanho | Formato | |
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| PETCrystallizationLithiumAcetate.pdf | 564,39 kB | Adobe PDF |  Visualizar/Abrir |
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