The thermal behaviors and mechanical properties of isotactic polypropylene (iPP) with a composite P-nucleating agent VP-101T has been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and polarized optical microscopy (POM) and mechanical measurements. The crystallization temperature did not increase with the further addition of nucleating agent. The relative P-form content and the total crystallinity increase a lot. By adding VP-101T, the impact strength could be increased by 3~4 times. The heat deflection temperatures are increased as well. With the increasing concentration of VP-101T, the morphologies of P-crystals change from to cluster of crystalline. The optimal concentration of VP-101T is 0.2%.
展开▼
