“…3 It may also happen that additives with high refractive indices hinder the observation of polymer samples under lighttransmission microscopes, making the use of the classic method for growth rate measurements impossible. 4 Furthermore, if spherulites with different growth rates arise in various concentrations during solidification (as for polymorphs and polymer blends), the conventional measure of growth rates may not be easy, especially for less abundant spherulite types. Usually, to measure growth rates of different crystalline forms, it is necessary to add specific nucleating agents, although these foreign substances could affect the crystallization kinetics of the polymer.…”