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Bubble Growth In Reaction Injection Molded Parts Foamed By Ultrasonic Excitation

J. Youn, H. Park
Published 1999 · Materials Science

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Processing of microcellular foam was studied for polyurethane. Assuming that the bubble growth is controlled by diffusion, theoretical prediction was carried out numerically to understand the bubble growth mechanism in the cavity during mold filling. Final bubble sizes were also predicted by considering the gelation time and the diffusion boundary. Viscosity change of the mixed polyurethane resin during polymerization reaction was predicted by considering reaction kinetics. The gelation time was determined to terminate the numerical calculation. The diffusion boundary was predicted based on the number of nucleated bubbles that had been determined both theoretically and experimentally. For processing of polyurethane foam by reaction injection molding, ultrasonic excitation was applied to the mixture of polyol and isocyanate. The polyol resin was supersaturated with nitrogen gas at an elevated pressure and ultrasonic excitation was applied to the mixture after impingement mixing of two components of the selected polyurethane system. Bubble nucleation was induced by the ultrasonic excitation and the bubbles were grown as the gas was supplied to the bubble from the resin.
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Study of the Introduction of Vibration Field and Blending Modification with Polyethylene on Microcellular Foaming of Polycarbonate Foam
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Study of Vibration Field on Microcellular Foaming in Nucleating Agents
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Recent advancements in manufacturing technologies of microcellular polymers: a review
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A novel manufacturing strategy for bio-inspired cellular structures
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Numerical simulation of mold filling in foam reaction injection molding
D. Seo (2003)
Processing of microcellular nanocomposite foams by using a supercritical fluid
Dongho Wee (2004)
Multilayer porous UHMWPE scaffolds for bone defects replacement.
A. Maksimkin (2017)
Optimization of low frequency sound absorption by cell size control and multiscale poroacoustics modeling
J. Park (2017)
Processing of polyurethane/polystyrene hybrid foam and numerical simulation
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Numerical analysis of injection molding for filling efficiency on ultrasonic process
J. Y. Lee (2008)
Morphological and biological characterization of density engineered foams fabricated by ultrasonic sonication
Carmen Torres-Sánchez (2011)
Bubble development in a polymeric resin under vacuum
In Hwan Sul (2012)
Effect of Processing Parameters and Vibrating Field on Poly(Vinyl Chloride) Microcellular Foam Morphology
Qingfeng Wu (2009)
Effect of Oscillatory Shear on Polystyrene Cell Morphology
Chang-Yun Gao (2006)
Manufacture of graded porosity foams: simulation of local ultrasonic pressure and comparison with experimental results
C. Torres-Sánchez (2010)
Strategy for preparation of microcellular rigid polyurethane foams with uniform fine cells and high expansion ratio using supercritical CO2 as blowing agent
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Numerical analysis on reaction injection molding of polyurethane foam by using a finite volume method
Dongjin Seo (2005)
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