Generalization and modelling of rigid polyisocyanurate foam reaction kinetics, structural units effect, and cell configuration mechanism

Xu, Jie; Wu, Tao; Sun, Wei; Peng, Chuang

Abstract

PIR/PUR ratio was derived from differential manipulation of generalized polyisocyanurate kinetic model. The structural unit effects on polymerization of isocyanurate, urethane and urea linkages were evaluated based on Mayo-Lewise tercopolymerization scheme. The cell microstructural configuration model was further developed from profiled FOAMAT reactivity parameters with integrated analysis of cell interface physics. The interstitial border area was defined by interface free energy theory, the shear viscosity was evaluated by foam motion, gas fraction, and partial pressure, and the cell inflation was re-examined by gas-liquid surface tension variability. The cell anisotropic degree, assumed as an aspect ratio of infinitesimal volume elements in cell uniformity, was characterized by equilibrated work increase of surface energy approximated by 2D stretching deformation from sphere cell to spheroid cell. The relationship between pressure and surface tension of elongated cells was also derived from modelling at the same condition of cell deformation.

Citation

Xu, J., Wu, T., Sun, W., & Peng, C. (2017). Generalization and modelling of rigid polyisocyanurate foam reaction kinetics, structural units effect, and cell configuration mechanism. Cellular Polymers, 36(6),

• Journal Article Type: Article
• Acceptance Date: May 8, 2017
• Publication Date: 2017-11
• Deposit Date: Oct 17, 2017
• Publicly Available Date: Nov 30, 2017
• Journal: Cellular Polymers
• Electronic ISSN: 0262-4893
• Peer Reviewed: Peer Reviewed
• Volume: 36
• Issue: 6
• Keywords: Polyisocyanurate, PIR/PUR ratio, Polymerization, Cell interstitial area, Degree of anisotropy
• Public URL: https://nottingham-repository.worktribe.com/output/859831
• Publisher URL: http://www.polymerjournals.com/journals.asp?Search=YES&JournalID=103074&JournalType=cp
• Additional Information: For educational and research use only. ; Xu, Jie and Wu, Tao and Sun, Wei and Peng, Chuang; (2017) Generalization and modelling of rigid; polyisocyanurate foam reaction kinetics, structural units; effect, and cell configuration mechanism. Cellular; Polymers, 36 (6). pp. 285-312. ISSN 0262-4893 published by Smithers Rapra.( http://www.polymerjournals.com )