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Creep deformation of poly(methyl methacrylate)-multiwalled carbon nanotube composites

Authors
  • Chang, Man-Fang1
  • Yang, Fuqian2
  • Lee, Sanboh1
  • 1 National Tsing Hua University, Hsinchu, 300, Taiwan , Hsinchu (Taiwan)
  • 2 University of Kentucky, Lexington, KY, 40506, USA , Lexington (United States)
Type
Published Article
Journal
Journal of Polymer Research
Publisher
Springer Netherlands
Publication Date
Oct 25, 2020
Volume
27
Issue
11
Identifiers
DOI: 10.1007/s10965-019-1932-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

Considering the long-term structural stability of polymer-nanotube composites under different service conditions, we investigate the tensile creep of polymer-nanotube composites consisting of poly(methyl methacrylate) (PMMA) and multiwalled carbon nanotubes (MWCNTs). The PMMA is pre-irradiated by ultraviolet light with different doses to change the molecular weight. The creep deformation of the PMMA-MWCNT composites with the weight fraction of MWCNTs in a range of 0 to 0.7 wt.% in a temperature range of 50 to 80 °C is well described by a Maxwell standard model with parallel connection between a spring, E1, and a Maxwell element (a dashpot, η, in the series connection with a spring, E2). The value of E1 is a linear function of the inverse of the normalized weight fraction with the average values of the coefficients/constants for the linear relation being increasing functions of the weight fraction of MWCNTs. The value of η is a power function of the molecular weight with a power index of ~3.3. The activation energy for the creep deformation of the PMMA-MWCNT composites increases with the increase of the weight fraction of MWCNTs.

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