Abstract
The bubble wall rupture (BWR) behaviour and the resultant cell connections of polystyrene (PS) foams were thoroughly investigated. The experimental results indicated that the open porosity ψ of the PS foams was highly dependent on the nucleation density ρn but had multiple varying paths at different expansion ratios Er. The non-uniformity of the bubble wall during bubble growth was considered herein as the key to explaining the multiple paths; the non-uniformity was quantified in terms of a heterogeneity factor γ. The bubble wall shape evolution model was employed to theoretically calculate the bubble wall shape after the bubble growth. The open porosity ψ and bubble wall non-uniformity γ had good regularity because the macroscopic changes in ψ were governed by the microscopic BWR. The functional image of ψ with respect to Er and ρn, considered as two independent variables, was obtained, and the image accuracy was further verified experimentally.
Published Version
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