Abstract
The nucleating ability of p-cyclohexylamide carboxybenzene (β-NA) towards isotactic polypropylene (iPP) was investigated by differential scanning calorimetry, X-ray diffraction, polarized optical microscopy and scanning electron microscopy. β-NA is identified to have dual nucleating ability for α-iPP and β-iPP under appropriate kinetic conditions. The formation of β-iPP is dependent on the content of β-NA. The content of β-phase can reach as high as 96.96% with the addition of only 0.05 wt% β-NA. Under non-isothermal crystallization the content of β-iPP increases with increasing cooling rate. The maximum β-crystal content is obtained at a cooling rate of 40 °C min–1. The supermolecular structure of the β-iPP is identified as a leaf-like transcrystalline structure with an ordered lamellae arrangement perpendicular to the special surface of β-NA. Under isothermal crystallization β-crystals can be formed in the temperature range 80–140 °C. The content of β-crystals reaches its maximum value at a crystallization temperature of 130 °C. © 2012 Society of Chemical Industry
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