Isothermal crystallization behavior of conductive carbon black/polyester composites

The crystallization property of the conductive carbon black/polyester (CB/PET) composites was tested by wide angle X-ray diffractometer and differential scanning calorimetry,and the kinetics of isothermal crystallization was analyzed with Avrami equation.The results showed that CB/PET has more perfect crystals and higher crystallinity degree than pure PET.The crystallization rate of CB/PET increases obviously with increasing of crystallization temperature and mass fraction of CB in composites.Compared with pure PET,the crystallization rate,the crystallite size and the crystallinity degree of CB/PET have been increased.The Avrami parameters(n,K,and t_(1/2)) are very sensitive to the crystallization temperature,and the values of n and K for PET and CB/PET are found to increase with increasing of the temperature while t_(1/2) decreases.At the same crystallization temperature for all the samples,both n and t_(1/2) go down with increasing of the mass fraction of CB in composites.