The samples of maleic anhydride graft polyproylene conposing different quantity of maleic anhydride are prepared.The kinetics of isothermal crystallization has been investigated by DSC.The physical and chemical mechanism by which succinic anhydride group reduces the surface free energy of radial growth of PP spherulite
increases the crystallization rate
but reduces the crystallinity was demonstrated.The influence of succinic anhydride group on mechanism of spherulite growth and nucleation was discussed.