摘要
Isotactic polypropylene (iPP) with high content of ~ crystalline form was prepared by adding a series of new p form nucleators. The spherulites and morphology of//farm iPP (//-iPP) were investigated by wide-angle X-ray diffraction(WAXD), polarizing microscope (PLM), scanning electron microscope (SEM) and small-angle light scattering (SALS). WAXD experimental results indicate that the amount of p form in iPP (K_x) increases with increasing /~ nucleator content from zero to 0.07 wt% or crystallization temperature T_c from 20 to 120℃ and that the highest K_x value is up to 0.95. PLM observations suggest that p spherulites exhibit bright color and that their Maltese Crosses display some concentric banding of a rather spiky, jagged character. Their !amellae are smooth and relaxed layer-plate like structure by SEM and their SALS H_v patterns arc four-petalled.
Isotactic polypropylene (iPP) with high content of ft crystalline form was prepared by adding a series of new β form nucleators. The spherulites and morphology of β form iPP (β-iPP) were investigated by wide-angle X-ray diffraction (WAXD), polarizing microscope (PLM), scanning electron microscope (SEM) and small-angle light scattering (SALS). WAXD experimental results indicate that the amount of β form in iPP (K_x) increases with increasing β nucleator content from zero to 0.07 wt% or crystallization temperature Tc from 20 to 120℃ and that the highest K_x value is up to 0.95. PLM observations suggest that β spherulites exhibit bright color and that their Maltese Crosses display some concentric banding of a rather spiky, jagged character. Their lamellae are smooth and relaxed layer-plate like structure by SEM and their SALS H, patterns are four-petal-led.
