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Strategies to estimate the pressure drop threshold of nucleation for polystyrene foam with carbon dioxide / Siu N. Leung in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1921–1927 Titre : Strategies to estimate the pressure drop threshold of nucleation for polystyrene foam with carbon dioxide Type de document : texte imprimé Auteurs : Siu N. Leung, Auteur ; Anson Wong, Auteur ; Chul B. Park, Auteur Année de publication : 2009 Article en page(s) : pp. 1921–1927 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Pressure  drop  threshold  Polymer  foaming  processes  Bubble  nucleation Résumé : Two methods to predict the pressure drop threshold (ΔPthreshold) to initiate bubble nucleation in polymer foaming processes are developed. One method uses the modified nucleation theory developed in our previous work, while the other utilizes computer simulations to model the growth profiles of the first observable bubbles in batch foaming experiments. These two approaches have shown reasonably good agreement qualitatively with each other in their ΔPthreshold predictions. Moreover, the effects of the pressure drop rate, the gas content, and the processing temperature on ΔPthreshold are demonstrated. It was found that the pressure drop rate does not have a significant effect on ΔPthreshold, while increasing the gas content or the processing temperature leads to a decrease in ΔPthreshold. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800079x [article] Strategies to estimate the pressure drop threshold of nucleation for polystyrene foam with carbon dioxide [texte imprimé] / Siu N. Leung, Auteur ; Anson Wong, Auteur ; Chul B. Park, Auteur . - 2009 . - pp. 1921–1927. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1921–1927 Mots-clés : Pressure  drop  threshold  Polymer  foaming  processes  Bubble  nucleation Résumé : Two methods to predict the pressure drop threshold (ΔPthreshold) to initiate bubble nucleation in polymer foaming processes are developed. One method uses the modified nucleation theory developed in our previous work, while the other utilizes computer simulations to model the growth profiles of the first observable bubbles in batch foaming experiments. These two approaches have shown reasonably good agreement qualitatively with each other in their ΔPthreshold predictions. Moreover, the effects of the pressure drop rate, the gas content, and the processing temperature on ΔPthreshold are demonstrated. It was found that the pressure drop rate does not have a significant effect on ΔPthreshold, while increasing the gas content or the processing temperature leads to a decrease in ΔPthreshold. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800079x