Abstract
In this work beta nucleating agent is synthesized and mixed with various grades of polypropylene (PP). The beta nucleating agent (β-NA) content, melt flow rate (MFR) of PP and cooling rate as independent variables are correlated to the beta crystal content (β-PP) by using Response Surface Methodology (RSM) models. Central cubic design was employed for experimental design. The crystallization behavior of various grades of PP at different percentage of beta nucleating agents is analyzed by differential scanning calorimetry (DSC) at three different cooling rates. The results showed that the enthalpy of fusion of beta crystals (△H β ) are directly related to the amount of β-NA. The sensitivity of the alpha polymorph to beta nucleating agent concentration increased with increasing the cooling rate . The optimal condition to achieve to a maximum K β are obtained for the resin with MFR of 21 g/10min containing 0.59 %wt β-NA and cooling rate of 8 ° C/min. • The optimal crystallization conditions are needed to achieve the maximum portion of beta polymorph in polypropylene. • Cooling rate has the greatest influence on the formation of beta polymorph in the beta nucleated PP. • The fraction of beta polymorph directly is correlated to the percentage of β nucleating agent. • At low melt cooling rate, the amount of alpha polymorph is less sensitive to melt flow rate of polypropylene.
Published Version
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