METHOD OF DETERMINING THERMOPHYSICAL CHARACTERISTICS OF POLYURETHANE FOAMS Russian patent published in 2007 - IPC G01N25/18 

FIELD: polymer materials.

SUBSTANCE: method consists in that a heat-insulated surface is affected by in-the-line heat pulses with constant power and period. A series of foamed polyurethane samples with preliminarily determined and different heat- and temperature-conductivity are selected. In-the-line action by heat pulses is accomplished on the surface of each of the samples one after another, during which procedure three temperatures T_n1, T_n2, and T_n3 are recorded in pulse delivery moments n₁, n₂, and n₃. From data obtained calibration curves are plotted for heat-conductivity as function of temperature difference (T_n2-T_n1) and for temperature-conductivity as function of temperature difference ratio (T_n2-T_n1)/(T_n3-T_n1). By using thus obtained calibration curves, sought characteristics are obtained.

EFFECT: increased determination accuracy.

4 dwg, 1 tbl