Fibers and Polymers

The Korean Fiber Society (한국섬유공학회)
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Processing of Polyurethane/polystyrene Hybrid Foam and Numerical Simulation

  • Lee, Won Ho (School of Materials Science and Engineering, Seoul National University) ;
  • Lee, Seok Won (School of Materials Science and Engineering, Seoul National University) ;
  • Kang, Tae Jin (School of Materials Science and Engineering, Seoul National University) ;
  • Chung, Kwansoo (School of Materials Science and Engineering, Seoul National University) ;
  • Youn, Jae Ryoun (School of Materials Science and Engineering, Seoul National University)
  • Published : 2002.12.01
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Abstract

Polyurethane foams were produced by using a homogenizer as a mixing equipment. Effects of stirring speed on the foam structure were investigated with SEM observations. Variation of the bubble size, density of the foam, compressive strength, and thermal conductivity were studied. A hybrid foam consisting of polyurethane foam and commercial polystyrene foam is produced. Mechanical and thermal properties of the hybrid foam were compared with those of pure polyurethane foam. Advancement of flow front during mold filling was observed by using a digital camcorder. Four types of mold geometry were used for mold filling experiments. Flow during mold filling was analyzed by using a two-dimensional control volume finite element method. Variation of foam density with respect to time was experimentally measured. Creeping flow, uniform density, uniform conversion, and uniform temperature were assumed for the numerical simulation. It was assumed for the numerical analysis that the cavity has thin planar geometry and the viscosity is constant. The theoretical predictions were compared with the experimental results and showed good agreement.

Keywords

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