Abstract: The influence of Ultrafine Full-Vulcanized Acrylate Powdered Rubber(UFAPR) on the isothermal crystallization kinetics and nonisothermal crystallization behavior of PA6 has been studied by means of DSC. The results show that with the introduction of a small amount of UFAPR, the crystallization rate of PA6 can be increased obviously, and the crystallization temperature range can be augmented and the crystallite size distribution of the crystal can be narrowed down. The change of free energy perpendicular to the crystal nucleus, which has been calculated according to the Hoffman theory, is consistent with the result of Avrami′s equation. The unit surface free energy of the radial-developing crystal spherulite decreases while the crystallization rate of PA6 increases with the introduction of UFAPR. Meanwhile, it is shown by means of the polarizing microscope(PLM) that the crystal size drops down and the number of the crystal grains augments with the addition of UFAPR, which shows that UFAPR can function as a nucleating agent.

Key words: PA6, UFAPR, Isothermal crystallization, Nonisothermal crystallization, Crystallization kinetics