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Microstructure measurement and microgeometric packing characterization of rigid polyurethane foam defects

Xu, Jie; Wu, Tao; Zhang, Jianwei; Chen, Hao; Sun, Wei; Peng, Chuang

Authors

Jie Xu

Tao Wu

Jianwei Zhang

Hao Chen

Wei Sun

Chuang Peng



Abstract

Streak and blister cell defects pose extensive surface problems for rigid polyurethane foams. In this study, these morphological anomalies were visually inspected using 2D optical techniques, and the cell microstructural coefficients including degree of anisotropy, cell circumdiameter, and the volumetric isoperimetric quotient were calculated from the observations. A geometric regular polyhedron approximation method was developed based on relative density equations, in order to characterize the packing structures of both normal and anomalous cells. The reversely calculated cell volume constant, Cc, from polyhedron geometric voxels was compared with the empirical polyhedron cell volume value, Ch. The geometric relationship between actual cells and approximated polyhedrons was characterized by the defined volumetric isoperimetric quotient. Binary packing structures were derived from deviation comparisons between the two cell volume constants, and the assumed partial relative density ratios of the two individual packing polyhedrons. The modelling results show that normal cells have a similar packing to the Weaire-Phelan model, while anomalous cells have a dodecahedron/icosidodecahedron binary packing.

Journal Article Type Article
Publication Date May 24, 2017
Journal Cellular Polymers
Electronic ISSN 0262-4893
Peer Reviewed Peer Reviewed
Volume 36
Issue 4
APA6 Citation Xu, J., Wu, T., Zhang, J., Chen, H., Sun, W., & Peng, C. (2017). Microstructure measurement and microgeometric packing characterization of rigid polyurethane foam defects. Cellular Polymers, 36(4),
Keywords Microstructure, Microgeometry, Relative density, Polyhedrons, Anisotropy, Cell volume constant, Isoperimetric quotient
Related Public URLs http://search.proquest.com/docview/1895709069?accountid=8018
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is the accepted manuscript of an article published in Cellular Polymers, Vol. 36, No. 4, 2017. Copyright Smithers Information Ltd. 2017.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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