کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5199474 1381531 1991 7 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Investigation of equilibrium crystallization processes of n-alkane multicomponent systems
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Investigation of equilibrium crystallization processes of n-alkane multicomponent systems
چکیده انگلیسی
The thermodynamic equilibrium between multicomponent melt and several solid solutions is computed for n-alkane mixtures consisting of many different homologues. The algorithm is based on the knowledge of the equations of state for the multicomponent melt and the solid solutions. Using pair interaction energies for the solid pahses, which include the relative chain length differences of a pair of molecules, the sets of transcendental equations for the heterogeneous equilibrium can be solved by numerical methods. The results obtained from these calculations are compared with structure properties of the n-alkane solid solutions, which are evaluated from differential scanning calorimetry and X-ray measurements. It follows that the crystallization behaviour of the mixtures can be described by using just one pair interaction parameter, K = 3500 cal mol−1, in a temperature range between liquidus and solidus. Further theoretical predictions for the miscibility of homologues in the solid state are obtained, which are of great interest for the crystallization processes in oligomer systems such as fractions of linear polyethylene with extended chain crystals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 32, Issue 16, 1991, Pages 3006-3012
نویسندگان
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