Abstract
In polypropylene (PP) filaments of several draw ratios the deformations of spherulites were observed by x-ray diffraction and photomicroscope. When filaments are stretched, the large spherulites are deformed much more than the smaller ones, and for various steps of elongation, the greater the size of spherulites, the higher the degree of orientation.The mechanical effects caused by the change of the molecular chain configuration of each spherulites have also been examined.(1) The tensile moduli in drawn PP filaments of large spherulites are greater than those of small spherulites, while in undrawn filaments their moduli are independent of spherulite sizes.(2) The equilibrium thermal stresses in drawn filaments composed of large spherulites tend to have entropy effects above 100°C, while in small spherulitic filaments thermal stress increases above 120°C.
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