Abstract
In our work, zinc hexahydrophthalate (HHPA-Zn) was synthesized and its β-nucleating activity in isotactic polypropylene (iPP) was confirmed. The single crystals of HHPA-Zn were obtained for the first time, with the crystal structure analyzed. The results of differential scanning calorimeter (DSC) and wide-angle X-ray scattering (WAXS) showed that HHPA-Zn increased the crystallization temperature of iPP by 11.2 °C and induced considerable amount of β-crystalline iPP (β-iPP) with the Kβ up to 0.66. The investigations of the mechanical performance of iPP showed an increase of 193% in the impact strength with the help of HHPA-Zn. Based on the crystal structure data and the lattice matching theory, the structural matching mechanism of HHPA-Zn and iPP was proposed, and the crystallization process of iPP induced by single crystals of HHPA-Zn was observed by polarized light microscope (PLM) to support the epitaxial crystallization of β-iPP. Flash differential scanning calorimeter (Flash DSC) was conducted to explain the formation of a bit α-crystalline in crystallization.
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