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 degrees 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. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1595-1601, 2013