Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/101
Título: | Evaluation of the instantaneous nucleation density in the isothermal crystallization of polymers |
Autor(es): | Martins, J. A. Pinto, J. J. C. Cruz |
Palavras-chave: | Isothermal crystallization Spherulite Nuclei |
Data: | 2002 |
Editora: | Elsevier |
Revista: | Polymer |
Citação: | "Polymer". 43 (Jun. 2002) 3999-4010. |
Resumo(s): | An expression is established for the temperature dependence of the average density of nuclei, as well as a temperature-dependent relationship between the half-crystallization times, t50%, obtained from isothermal differential scanning calorimetry polymer crystallization experiments, and the linear spherulite growth rate, G, obtained by hot stage optical microscopy. This relationship allows the evaluation of the mean number of nuclei per unit volume grown at a given crystallization temperature. For an athermal nucleation, the spacial density of nuclei is simply related to their surface density in a sample's cross-section, and the experimentally observed mean number of nuclei is compared with the predict value, at each crystallization temperature. It is also shown that the ratio betweebñ the temperature dependencies of 1n(1/t50%) and 1n(G) may be used as an indicator of the nucleation type and of the morphology developed. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/101 |
DOI: | 10.1016/S0032-3861(02)00221-5 |
ISSN: | 0032-3861 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
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50.pdf Acesso restrito! | 224,72 kB | Adobe PDF | Ver/Abrir |