Effect of the viscosity of expandable phenolic resin on the formation process and performance of phenolic/polyurethane foam

WEN ZhenGuang; XU Liang; CHENG Jue

Journal of Beijing University of Chemical Technology ›› 2011, Vol. 38 ›› Issue (2) : 52-57.

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Journal of Beijing University of Chemical Technology ›› 2011, Vol. 38 ›› Issue (2) : 52-57.
材料科学与工程

Effect of the viscosity of expandable phenolic resin on the formation process and performance of phenolic/polyurethane foam

  • WEN ZhenGuang; XU Liang; CHENG Jue
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Abstract

A novel heat resistant foam has been prepared using a polyurethane prepolymer with terminal isocyanate groups and expandable phenolic resin. The structure of the expandable phenolic resin was controlled by adjusting the reaction time. The effect of varying the viscosity (molecular weight) of the expandable phenolic resin on the formation process and performance of the foam was investigated. The experimental results showed that the resulting foam had good volume stability and low shrinkage when the viscosity of the phenolic resin was more than 2.15 Pa·s. With increasing molecular weight of the expandable phenolic resin (equal to the viscosity increasing from 2.15 to 5.05 Pa·s), the density of the foam stabilized between 60.16 and 63.96 kg/m3 . The bending strength of the novel foam reached 0.2 MPa, and bending strain was more than 15 %, much better than the corresponding values for pure phenolic foam; The mass loss of the foam was 5%-6%, and the volume decrease was about 5% when the foam was heated at 150 ℃ for 2 h, indicative of good thermal stability. When the density decreased from 95 to 55 kg/m3 , the foam still maintained good toughness and good dimensional stability. The novel phenolic/polyurethane foam therefore has better thermal stability than polyurethane foam and better toughness than phenolic resin foam.

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WEN ZhenGuang; XU Liang; CHENG Jue. Effect of the viscosity of expandable phenolic resin on the formation process and performance of phenolic/polyurethane foam[J]. Journal of Beijing University of Chemical Technology, 2011, 38(2): 52-57

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