Fig. 1b shows the crystallization temperatures (Tc) of the iPP with various contents of β-NA. The Tc was obtained under non-isothermal cooling at the rate of 10 °C/min after melting at 210 °C. The iPP showed a Tc at 108 °C while the β-NA modified iPP exhibited a slightly higher Tc in the presence of β-NA. The Tc was raised to about 120 °C when β-NA was added by 0.20 wt% and beyond. This increment was attributed to the heterogeneous nucleation induced by the β-NA. It was further observed that the maximum increment ofTc was found when the content of β-NA was at 0.30 wt% and beyond, implying that the amount of β-NA nucleating agent by more than 0.30 wt% would not raise the crystallization temperature any further. Numerous research reported similar behavior for iPP modified with a compound of stearic acid and stearate lanthanum [4], WBG [12], MWCNT-supported β-NA [27], cadmium bicyclo hept-5-ene-2,3-dicarboxylate [30] and sodium benzoate [32].