The effects of untreated kaolin and Gamma-glycidoxypropyltrimethoxysilane (KH560) -treated kaolin on isothermal and nonisothermal nystallization of nylon6 (PA6) have been studied by means of Differential Scanning Calorimetry. The results show that both the untreated kaolin and the KH560-treated kaolin play the role of nucleating agent. Compared with the untreated kaolin

the KH560-treated kaolin improves more effectively the crystallization rate of PA6. This is attributed

in part

to the increase of nucleation density caused by the finer dispersion of the KH560-treated daolin than the untreated kaolin in PA6 matrix and

partly

to the increase of the crystallization growth rate caused by the improvement of the compatibility between PA6 and the KH560-treated kaolin.