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Pimelic acid‐based nucleating agents for hexagonal crystalline polypropylene

Isotactic polypropylene (PP) resin was doped with pimelic acid, sodium pimelate, and calcium pimelate to stimulate the growth of hexagonal crystalline polypropylene (β‐PP). The doped resin was crystallized in a differential scanning calorimeter (DSC) and during compression molding and injection molding. The effect of the additives on the formation of β‐PP was examined using DSC and wide angle X‐ray scattering (WAXS). Pimelic acid alone was found ineffective while the pimelates induced 64% to 90% of β‐growth depending on the nucleating agent system and crystallization condition. In particular, the pimelic acid/calcium stearate system produced a more consistent and higher yield of β‐PP. This was attributed to finer particle size and better dispersion of the nucleating agent.