Sintering and densification of polymer particles during rotational molding

Abstract : "ln this thesis the phenomena of Coalescence (two grains and multiple grains) and Densification (before and after the formation of air bubbles) in polymers are studied numerically and experimentally. First, the effect of different parameters on the coalescence of two grains is examined experimentally. Then, the coalescence of severa! grains is studied, in arder to investigate the effect of neighboring grains on the coalescence of two central grains. Based on this study, a new madel describing the simultaneous coalescence of severa! grains is proposed. This madel is based on Bellehumeur's madel for the coalescence of two grains, which was first validated for our polymers (PP and PVDF). Considering the densification phenomenon, a new madel is proposed to express the evolution of powder density during the first stage of densification, by considering BCT arrangement for the presence of grains. The two proposed madel are validated using experimental results. For the simulation of coalescence and densification of the polymer grains, two different techniques are developed. ln the first technique, CFD and VOF are employed to study the formation of air bubbles and polymer flow. ln the second technique, SPH method is developed, first in mono-phase to study the coalescence of two grains and then in bi-phase to simulate the densification of grains and the formation of air bubbles."
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Monir Asgarpour. Sintering and densification of polymer particles during rotational molding. Mechanics [physics.med-ph]. Arts & Métiers Paristech, 2010. English. ⟨NNT : 2010ENAM0034⟩. ⟨tel-01365886⟩

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