Effects of ordered structure on non-isothermal crystallization kinetics and subsequent melting behavior of β-nucleated isotactic polypropylene/graphene oxide composites

• Published in: Journal of thermal analysis and calorimetry Vol. 136; no. 4; pp. 1667 - 1678
• Main Authors: Yu, Yansong, Zeng, Fangxinyu, Chen, Jinyao, Kang, Jian, Yang, Feng, Cao, Ya, Xiang, Ming
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 30.05.2019; Springer Nature B.V
• Subjects: Analytical Chemistry; Beta phase; Chemistry; Chemistry and Materials Science; Cooling; Cooling rate; Crystallization; Fusion temperature; Graphene; Heat treating; Inorganic Chemistry; Isotacticity; Measurement Science and Instrumentation; Melting; Physical Chemistry; Polymer matrix composites; Polymer Sciences; Polypropylene; Recrystallization; Temperature; Thermal stability; Non-isothermal crystallization kinetics; Graphene oxide; Isotactic polypropylene; Ordered structure; Nucleating agent
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-018-7776-8

In this paper, effects of ordered structure on non-isothermal crystallization kinetics and subsequent melting behavior of β -nucleated isotactic polypropylene/graphene oxide composites were investigated. Under all cooling rates, as fusion temperature T f stepped into the range of 168–178 °C, the ordered structure survived in the melt, resulting in the increase in crystallization peak temperature T p , the decrease in crystallization activation energy Δ E and the decrease in the half crystallization time t 1/2 . When endset temperature of cooling T end  = 50 °C, lower cooling rate encouraged the formation of more β -phase. Moreover, the influence of ordered structure on β - α recrystallization was studied by adjusting the T end . When T end  = 105 °C, higher cooling rate encouraged the formation of more β -phase. The ordered structure was favorable for the improvement of the thermal stability of the β -phase during β - α recrystallization.