OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING

Nan Li; Wei Cheng; Kun Ren; Feng Luo; Ke Wang; Qiang Fu

doi:10.1007/s10118-013-1204-0

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OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING

PAPER | Updated：2023-01-03

- OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING
- Chinese Journal of Polymer Science Vol. 31, Issue 1, Pages: 98-109(2013)
- Affiliations：
  
  College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  **Ke Wang (王柯), wkestar@scu.edu.cn
  Qiang Fu (傅强), E-mail: qiangfu@scu.edu.cn
- Funds：
- DOI：10.1007/s10118-013-1204-0
  CLC：
- Received：09 May 2012，
  
  Revised：2012-07-09，
  
  Accepted：25 July 2012，
  
  Published：2013-01
- Accepted：
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Nan Li, Wei Cheng, Kun Ren, et al. OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING[J]. Chinese Journal of Polymer Science, 2013, 31(1): 98-109.
DOI：

Nan Li, Wei Cheng, Kun Ren, et al. OSCILLATORY SHEAR-ACCELERATED EXFOLIATION OF GRAPHITE IN POLYPROPYLENE MELT DURING INJECTION MOLDING[J]. Chinese Journal of Polymer Science, 2013, 31(1): 98-109. DOI： 10.1007/s10118-013-1204-0.

摘要

Abstract

In this study

good dispersion status of graphite in a nonpolar

intractable polymer

i.e.

polypropylene (PP)

was realized in melt processing by using a specific dynamic packing injection molding (DPIM) technique. The exfoliation extent of graphite increased remarkably from the skin zone to the core zone of the molded part

as confirmed by combination of WAXD

SEM and TEM analyses

indicating an accelerated exfoliation occurred during the DPIM processing. This phenomenon is due to decreased melt flow c

hannel and increased melt viscosity as the solidification takes place from the wall into the center

which leads to greatly increased shear force. The good dispersion of graphite results in obvious reinforcements of both tensile strength and impact strength by adding moderate amount of graphite. The present study proposes a promising route for realizing the large-scale fabrication of structural parts of polymer/exfoliated-graphite nanocomposites with excellent mechanical properties.

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