Effects of melt structure on non‐isothermal crystallization behavior of isotactic polypropylene nucleated with α/β compounded nucleating agents

摘要: In this study, the effects of melt structure (tuned by controlling fusion temperature Tf) on non-isothermal crystallization and subsequent melting behaviors isotactic polypropylene (iPP) nucleated with α/β compounded nucleating agents (α/β-CNAs) have been further investigated. The results show that under all cooling rates studied (2–40°C/min), curves increased gradually decrease Tf, meanwhile, when Tf was in range 166–179°C where ordered structures survived (defined as Region II), activation energy ΔE found to be evidently lower compared Tf>179°C or < 166°C. heating showed occurrence Ordered Structure Effect can observed at studied; location II constant rate varied; Low encouraged formation more β-phase triggered structure. Moreover, role β-α recrystallization comparatively tuning end recooling (Tend) after held it high thermal stability low part II, while enhanced β-crystal relatively II. POLYM. ENG. SCI., 2016. © 2016 Society Plastics Engineers