聚四氟乙烯微粉对超临界CO<sub>2</sub>发泡聚丙烯泡孔结构及性能的改善

doi:10.11896/cldb.18050235

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Abstract Well-defined cellular structure of isotactic polypropylene (PP) foams with outstanding properties were prepared via supercritical carbon dio-xide (scCO₂) foaming of iPP blended with a small amount of polytetrafluoroethylene (PTFE) micropowder. PP/PTFE blend samples with PTFE contents of 1.0wt%, 5.0wt% and 10.0wt% were prepared using a regular co-rotating two-screw extruder and then the samples were foamed using scCO₂ as the physical blowing agent in a batch process. The results showed that the PTFE micropowder could be transformed into a fiber with a certain aspect ratio and entangled with each other to form a network structure after extrusion, which greatly increased the melt strength of PP/PTFE. Well-structured cell morphology of PP/PTFE foam was obtained. The cell size decreased from 87 μm to 31 μm as the loading of PTFE increasing and the cell density of PP/PTFE(10.0%) foam reached 7.4×10⁸ cells/cm³, which was more than 10 times higher as compared to the neat PP foam. In addition, the PTFE particles, and the growth of nucleated small cells in the multiple-phase system, were responsible for the enhanced heterogeneous nucleation of PP foaming with good cellular structure during the foaming process. Compared to the neat PP foam, PP/PTFE foams showed significantly improved tensile strength and tensile strain. Due to the remarkable decrease in cell size and increase in cell density, which increased from 6 MPa to 11 MPa and from 107% to 230%, respectively.

Key words： PP/PTFE blend supercritical carbon dioxide foaming microporous morphology melt strength tensile strength

Published: 12 September 2019

CLC number:

TQ328

Fund:This work was financially supported by the National Defense Fundamental Science Research Nuclear Science Challenge Program (TZ2018004) and the Natio-nal Natural Science Foundation of China (11079048).

About author:: Chenguang Yang received his bachelor's degree from Zhengzhou University (ZZU) in June 2014. Now he is a Ph.D. candidate at Shanghai Institute of Applied Phy-sics, Chinese Academy of Sciences, University of Chinese Academy Sciences. His current research focuses on the fabrication of polypropylene foaming with supercritical carbon dioxide, with the assistance of radiation crosslinking and the added nano/micro-particles. He has published more 10 scientific papers in renowned journals, such as Industrial & Engineering Chemistry Research, RSC Advances, Applied Surface Science, Journal of Applied polymer Science.
Guozhong Wu is a professor at Shanghai Institute of Applied Physics, Chinese Academy of Sciences, and also a part-time professor at ShanghaiTech University. He received his B.S. degree (1992) in radiation che-mistry from University of Science and Technology of China (USTC), and Ph.D. degree (1998) from the University of Tokyo (Japan). Professor Wu has conducted many researches on radiation chemistry, radiation modification and processing of polymers. His recent research interest includes supercritical CO₂ foaming, fibrous absorbent fabrication, and polymer degradation by radiation. Up to now, he has published more 200 papers in the national and international journals, with SCI indexed citation more than 2200 and H index of 23.

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Cite this article:

YANG Chenguang,ZHAO Quan,ZHANG Maojiang, et al. Improving Cellular Structure and Property of Supercritical CO₂ Foamed ofPolypropylene via the Addition of PTFE Micropowder[J]. Materials Reports, 2019, 33(21): 3547-3551.

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http://www.mater-rep.com/EN/10.11896/cldb.18050235 OR http://www.mater-rep.com/EN/Y2019/V33/I21/3547

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