In:
Journal of Cellular Plastics, SAGE Publications, Vol. 57, No. 6 ( 2021-11), p. 927-949
Abstract:
A simulation of simultaneous bubble nucleation and growth was performed for polyurethane/CO 2 physical foaming process. The single-factor and comprehensive effects of viscoelastic properties, Henry’s constant, CO 2 diffusion coefficient and surface tension on the cell morphology were numerically analyzed. The results show that the cell density of PU foam ( N 0 ) increases and its average cell diameter ( D v ) reduces with increased Henry’s constant and slower gas diffusion. Both N 0 and D v reduces with the curing degree ( α). In addition, the effects of α and foaming conditions on the cell structure were experimentally investigated. With an increase of α at foamable range, D v decreases continuously and N 0 increases first and then declines. With increasing saturation pressure and depressurization rate or decreasing temperature, N 0 increases and D v reduces. There is an intrinsic correlation between the simulated and experimental variables, and the results of the simulation and experiment are generally consistent.
Type of Medium:
Online Resource
ISSN:
0021-955X
,
1530-7999
DOI:
10.1177/0021955X20974291
Language:
English
Publisher:
SAGE Publications
Publication Date:
2021
detail.hit.zdb_id:
2098525-3
SSG:
2
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