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Keywords:

  • polyamides;
  • mechanical properties;
  • differential scanning calorimetry (DSC)

ABSTRACT

The void formation in polyamide 6 under tensile creep in alcohols has been characterized by use of thermoporosimetry. After the specimens were creep-elongated to a common preset strain of 9% in ethanol, 1-propanol, 1-butanol, 1-hexanol, and 1-octanol at room temperature, they were soaked in distilled water at 20°C, and then offered to the differential scanning calorimetry (DSC) under cooling. The exothermic peaks indicating the presence of freezable water were detected for all the specimens elongated in alcohols except 1-octanol. The void size distributions were assessed from the DSC curves by thermoporosimetry. The pores for the ethanol environment showed a wide size distribution from 2.5 to 8.5 nm in radius. The pores for 1-propanol and 1-butanol showed narrower distribution from 3 to 4 nm, and those for 1-hexanol concentrated upon very small size of about 2 nm. The average pore radius was shown to be correlated with the solubility parameter of environmental alcohol. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1595–1601, 2013