Effect of Heat-Treatment on the Heat Resistance of One-Stage Phenolic Resin Moldings

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Other Title
  • 一段法フェノール樹脂成形品の耐熱性に及ぼす熱処理の効果

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Two kinds of resols were prepared by the reaction of phenol, formaldehyde, and either sodium hydroxide or barium hydroxide (NR, BR). The samples for heat distortion temperature (HDT) were molded at various molding temperature from the resols contained 40% of glass fiber. HDT of the samples increased with an increase in molding temperature, and reached to 230-240°C when the samples were molded at a temperature of 140°C or above. At lower molding temperature (120°C, 130°C), HDT of BR series were higher than those of NR series, on the contrary, HDT of NR series were higher than that of BR series at a molding temperature of 140°C or above. HDT of both series of samples increased over 250°C by heat-treatment at 170°C for 8h. It was found that Tg of the samples heat-treated either at 210°C or 230°C were 310°C by means of thermomechanical analysis. It came to be apparent by means of thermogravimetry, IR, and elemental analysis that the effect of heat-treatment on the onset temperature of heat decomposition and the chemical composition of cured samples was insignificant.

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