3 years ago

Effects of Process Temperatures on the Flow-Induced Crystallization of Isotactic Polypropylene/Poly(ethylene terephthalate) Blends in Microinjection Molding

Effects of Process Temperatures on the Flow-Induced Crystallization of Isotactic Polypropylene/Poly(ethylene terephthalate) Blends in Microinjection Molding
Pengjian Gong, Xia Liao, Zhongguo Zhao, Qi Yang, Hongwen Sun, Yajiang Huang, Pingping Wu
In this work, the effects of mold and melt temperatures on microstructures and properties of micropart were systematically investigated. Results showed that the remarkably enhanced flow field generated during microinjection molding process proved to be beneficial in forming highly oriented self-fibrillating structures. In addition, especially in blends, changing the process temperatures from 200 °C to 270 °C significantly enhanced the onset crystallization temperature Tot = 4.8 °C), peak crystallization temperature (Δt = 1.5 °C), and the crystallization half-time (∼18.6 s). Interestingly, because of the orientation maintenance and shear amplification effects of in situ poly(ethylene terephthalate) (PET) microfibrils, the branching of lamella and the formation of hybrid-oriented structures (fan-shaped β-crystals and trans-crystals) were accelerated. Furthermore, relative content of the β crystal (increments of ∼14.1%) and the degree of orientation were also significantly improved as the process temperatures were increased.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02189

DOI: 10.1021/acs.iecr.7b02189

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