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.
Highlights
Polyurethane reactions scheme can be generalized as integration of blowing and gelling which includes primary water-hydroxyl-isocyanate reactions and secondary isocyanate oligomerizations
A certain degree of isocyanurate unit from isocyanate trimerization can be observed in characteristic polyisocyanurate chain structure which can be characterized mathematically by PIR/PUR ratio [5] based on kinetic reaction evaluation
The purpose of this study is to provide deep understanding of catalyzed polyisocyanurate reaction kinetics, copolymerization structural units effect, and cell configuration mechanism
Summary
PIR/PUR ratio was derived from differential manipulation of generalized polyisocyanurate kinetic model. 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 gasliquid 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 derived from modelling at the same condition of cell deformation
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