Non-isothermal crystallization kinetics of polypropylene/polytetrafluoroethylene fibrillated composites
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Non-isothermal crystallization kinetics of polypropylene/polytetrafluoroethylene fibrillated composites Yuhui Qiao1,2,3, Amirjalal Jalali3, Jinian Yang3,4, Yuguang Chen3, Shiwei Wang1,2, Yongchao Jiang2, Jianhua Hou1,2, Jing Jiang2, Qian Li1,2,*, and Chul B. Park3,*
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School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, People’s Republic of China 3 Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto M5S 3G8, Canada 4 School of Materials and Engineering, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China 2
Received: 27 May 2020
ABSTRACT
Accepted: 3 September 2020
Non-isothermal crystallization kinetics of polypropylene (PP)/polytetrafluoroethylene (PTFE) fibrillated composites is presented. In-situ fibrillated PP/ PTFE-composites containing 1 and 3 wt% PTFE were prepared by melt compounding using a twin-screw extruder. The morphology and non-isothermal crystallization behavior of the composites were examined using scanning electron microscopy and differential scanning calorimetry, respectively. The Mo equation was used to analyze the kinetics of non-isothermal crystallization behavior. The PTFE created a three-dimensional (3-D) network. A low PTFE content promoted crystallization through fast nucleation, whereas a high PTFE content decreased the crystallization kinetics through hindering the crystal growth. These findings are all based on the Mo equation analysis. The activation energy and nucleation activity were also evaluated, and the way in which the PTFE nanofibers affected the crystallization was discussed in detail. Polarized optical microscopy images revealed that the size of PP spherulites decreased with the increase of PTFE content. Finally, the effect of PTFE on the crystalline phase of PP was investigated by wide angle X-ray diffraction.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Gregory Rutledge.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05328-5
J Mater Sci
GRAPHIC ABSTRACT
Introduction As a very widely used thermoplastic resin, polypropylene (PP) is widely used in packaging, appliances, automotive materials, industrial and household goods. In these areas, it serves as films, sheets, tubes, blocks, and so on. However, its low melt strength and lack of strain hardening in extensional flow largely limit its applications in foaming and film blowing [1–4]. Therefore, many efforts have been made to improve PP’s melt strength to broaden its applications. Of these, Blending PP with other polymers, has been developed and has been increasingly used to design novel materials. For blends, successful interactions between the dispersed phase and the continuous matrix play a great role in improving the PP b
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