کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5189450 1381185 2007 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Foaming of polymers with supercritical CO2: An experimental and theoretical study
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Foaming of polymers with supercritical CO2: An experimental and theoretical study
چکیده انگلیسی
Microcellular polystyrene (PS) foams and porous structures of the biodegradable poly(d,l-lactic acid) (Pd,lLA) were prepared with the batch foaming technique (pressure quench) using supercritical CO2 as blowing agent. The effect of pressure, temperature and depressurization rate on the final porous structure was investigated. The results revealed that the size of the pores decreases and their population density increases with pressure increase, or decrease of temperature, and/or increase of the depressurization rate. The results were correlated by combining nucleation theory with NRHB model in order to account for and emphasize the physical mechanism related to nucleation of bubbles inside the supersaturated polymer matrix. A satisfactory agreement between correlations and experimental data was obtained indicating that the nucleation theory yields quantitative correlations when variables such as sorption, degree of plasticization, and surface tension of the system polymer-supercritical fluid are accurately described.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 20, 21 September 2007, Pages 5928-5939
نویسندگان
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