Thermal behavior of isotactic polypropylene in different content of β-nucleating agent

• Published in: Journal of thermal analysis and calorimetry Vol. 96; no. 3; pp. 733 - 740
• Main Authors: Xu, Linli, Xu, Kai, Chen, Dehong, Zheng, Qiukai, Liu, Feiyue, Chen, Mingcai
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2009; Springer
• Subjects: Analytical Chemistry; Applied sciences; Chemistry; Chemistry and Materials Science; Crystallization; Exact sciences and technology; Inorganic Chemistry; Measurement Science and Instrumentation; Organic polymers; Physical Chemistry; Physicochemistry of polymers; Polymer Sciences; Properties and characterization; Recrystallization/reorganization; β-Nucleating agent; β-Phase; β-Form; DSC; Isotactic polypropylene; Differential scanning calorimetry; Nucleation; Propylene polymer; Isotactic polymer; Recrystallization; Thermal analysis; β-Nucleating agents; Nucleating agent
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-009-0022-7

The effects of non-isothermal and isothermal crystallization on the formation of α- and β-phase in isotactic polypropylene (iPP) with different content of β-nucleating agent are investigated by differential scanning calorimetry (DSC). On non-isothermal crystallization, the content of β-phase and regularity of its crystals are depended on both cooling rate and the content of β-nucleating agent. The faster cooling rate is, the lower of melting peak temperature (T mp ) and crystallization peak temperature (T cp ) of α- and β-phase are. The enthalpy of fusion (∆H) of β-phase increases with cooling rate in a certain range for the sample with 0.1 wt% β-nucleating agent (G 1 ) and decreases for that with 0.3 wt% β-nucleating agent (G 3 ). On isothermal crystallization, the enthalpy of fusion of β-phase in G 1 is higher than in G 3 which is related to the efficiency of nucleation in different concentration of nucleating center in two samples.