期刊
POLYMER TESTING
卷 93, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106921
关键词
Polypropylene; Beta nucleating agent; Crystallization condition; Nucleating agent content; Melt flow rate (MFR); Cooling rate; Response surface methodology (RSM)
In this study, beta nucleating agent was synthesized and mixed with polypropylene, and their relationship was analyzed using Response Surface Methodology. DSC results showed a direct correlation between the enthalpy of fusion of beta crystals and the amount of beta-NA, while the sensitivity of the alpha polymorph to beta nucleating agent concentration increased with higher cooling rates. Optimal conditions for achieving maximum K-beta were identified for specific resin with MFR, beta-NA content, and cooling rate.
In this work beta nucleating agent is synthesized and mixed with various grades of polypropylene (PP). The beta nucleating agent (beta-NA) content, melt flow rate (MFR) of PP and cooling rate as independent variables are correlated to the beta crystal content (beta-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 (Delta H-beta) are directly related to the amount of beta-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-beta are obtained for the resin with MFR of 21 g/10min containing 0.59 %wt beta-NA and cooling rate of 8 degrees C/min.
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