کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
230727 1427398 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fundamental mechanisms of cell nucleation in polypropylene foaming with supercritical carbon dioxide—Effects of extensional stresses and crystals
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Fundamental mechanisms of cell nucleation in polypropylene foaming with supercritical carbon dioxide—Effects of extensional stresses and crystals
چکیده انگلیسی

This study aims to elucidate the fundamental mechanisms of extensional stress-induced foaming phenomena by in situ observation of polypropylene foaming processes using a view-cell system. The foaming processes of polypropylene blown with supercritical carbon dioxide have been observed under static conditions as well as dynamic conditions where extensional strains were applied. A bubble growth-induced cell nucleation phenomenon, where existing cells triggered the generation of cells around them, was observed under static conditions due to the presence of crystals. In the dynamic cases, the applied extensional stresses caused foaming to occur in a more dispersed manner. The bubble growth-induced cell nucleation phenomenon was also observed, but it occurred at a later stage and the effect was less dominant. These fundamental understandings will provide guidance to improve processing strategies of plastic foaming processes.

Figure optionsDownload as PowerPoint slideHighlights
► Observed PP foaming process in situ with supercritical CO2 under extensional strain.
► Investigated PP crystallization behavior under high pressure CO2 with DSC.
► Elucidated mechanisms of extensional stress- and crystal-induced cell nucleation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 79, July 2013, Pages 142–151
نویسندگان
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