Differential scanning calorimetry of the MWCNT/PDMS nanocomposite

The specific heat capacity of materials studied was determined using differential scanning calorimetry (DSC) method, with a sapphire standard, according to ASTM E1269-2011. A three step DSC procedure was employed, containing measurements with an empty pan, a pan containing sapphire calibration standard, and a pan containing sample.Thermal diffusivity (α) measurements were carried out using Laser Flash Apparatus LFA 427, Netzsch, Germany. The parameters used in the experiment were as follows: atmosphere – air, flow rate of 50 ml/min, laser voltage of 500 V, pulse time of 0.3 ms. The Cape-Lehman model with pulse correction was used to correct for radiation loss. A layer of graphite absorbent was sprayed on to obtain complete signal absorption. For statistical purposes, five measurements were made at each temperature. The temperature range was from 298 up to 373 K. The samples were heated at a rate of 0.3 K/min, and the system was stabilized for 2 minutes between each measurement.