Melt-crystallization was carried out to observe and compare the formation of created morphological structures (spherulites). The dried samples were placed between a microscope slide and a cover slip on the heating table (THMS 600, Linkam Scientific Instruments LTD, England). The temperature was increased to 125°C for 5 min and 250g of press force was applied to the cover slip. Then, the cooling was programmed with 1°C/min rate to the room temperature. The microscopic pictures were taken using polarized-light microscope (Nikon Eclipse E600).