Nano-free volume characterization by positron annihilation lifetime technique in flame-retardant poly (vinyl chloride) after thermal treatment

摘要

The flammability tests are performed on flame-retardant poly (vinyl chloride) (FRPVC) material that has been used in cable insulation and jacketing construction for multi-purpose reactor (MPR) at Atomic Energy Authority of Egypt,as well as carbon-black FRPVC (CB-FRPVC) material produced by Egyptian Electrical Cable Company (EECC).The temperature variation of thermal conductivity,thermal expansion coefficients,and nano-size free volumes by means of positron annihilation lifetime (PAL) technique are determined.Correlation of positron annihilation and thermal conductivity has been discussed in terms of phonons as the main heat carriers.