At concentration higher than 0.5% wt, it is likely that the crystallization temperature of iPP contained p-Cl-DBS remain
constant as shown in Table 2. Table 3 shows the effect of substitution position of Cl-DBS on the crystallization temperature of iPP. It was found that o-Cl-DBS and p-Cl-DBS show more effective in term of increasing the crystallization temperature of
iPP. Meanwhile, the bromo and chloro derivatives show an increasing in the crystallization temperature of iPP. Table 2 Crystallization temperature of neat iPP and iPP containing different concentration of p-Cl-DBS