Structure and Configuration Analyses of a Nucleating Agent for Isotactic Polypropylene Crystallization

doi:10.11938/cjmr20192763

Abstract

Abstract: The nucleating agent acts as a crystal nucleus during polypropylene (PP) crystallization, affecting the structure and size distribution of the crystal, and in turn the properties of PP products. It is a hot research topic to study the mechanisms by which the nucleating agent promotes polymer crystallization. Currently it is still unclear how the structure of nucleating agent affects polymer crystallization. In addition, a nucleating agent may have different chemical structures due to isomerization, further complicating the nucleation mechanism study. Structural studies of nucleating agents are therefore the foundation of the nucleation mechanism studies. In this work, the structure and configuration of a β nucleating agent used in PP crystallization were studied by the combination of nuclear magnetic resonance (NMR) spectroscopy, Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The FT-IR data suggested that the chelating way of calcium salt of cis-Δ4-tetrahydrophthalic acid in the nucleating agent belongs to the bridge type, while the cis-Δ4-tetrahydrophthalic acid is a mesomer.

Key words: polypropylene (PP), nucleating agent, bridge type chelating, structure and configuration, organic metal salts

CLC Number:

O482.53

WEN Liang, LI Chun-fa. Structure and Configuration Analyses of a Nucleating Agent for Isotactic Polypropylene Crystallization[J]. Chinese Journal of Magnetic Resonance, 2020, 37(3): 291-299.

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