An unexpected plasticization phenomenon and a constant of the change rate of viscoelastic properties for polymers during nanoindentation test

Tang, Xue-Gang, Hou, Meng, Truss, Rowan, Zou, Jin, Yang, Wei, Dong, Zhi-Gang and Huang, Han (2011) An unexpected plasticization phenomenon and a constant of the change rate of viscoelastic properties for polymers during nanoindentation test. Journal of Applied Polymer Science, 122 2: 885-890. doi:10.1002/app.34032


Author Tang, Xue-Gang
Hou, Meng
Truss, Rowan
Zou, Jin
Yang, Wei
Dong, Zhi-Gang
Huang, Han
Title An unexpected plasticization phenomenon and a constant of the change rate of viscoelastic properties for polymers during nanoindentation test
Journal name Journal of Applied Polymer Science   Check publisher's open access policy
ISSN 0021-8995
1097-4628
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1002/app.34032
Volume 122
Issue 2
Start page 885
End page 890
Total pages 6
Place of publication Springer New York
Publisher New York, NY, United States
Collection year 2012
Language eng
Abstract The effect of loading force, loading rate and unloading rate on the viscoelastic behavior of three representative polymers: poly(methyl methacrylate) (PMMA, amorphous polymer), polyvinylidene fluoride (PVDF, semicrystalline polymer), and epoxy (crosslinked polymer) have been investigated using nanoindentation. The results showed that the maximum indentation depth increased with the increase of loading force, and the relationship between loading force and depth became linear when the loading force is beyond 3000 μN. At the beginning, the plasticity index changed substantially with the increase of loading force, and after reaching a critical loading force, the plasticity index almost remained constant. The maximum indentation depth decreased with the increase of loading rate, which followed a power law curve. With the increase of loading rate, a plasticization phenomenon happened, and a possible reason is that the heat may accumulate and raise the local temperature. The plasticity index initially followed the power law with the increase of unloading rate and then almost remained constant. A constant, the change rate of viscoelastic properties with the unloading rate, for the three representative polymers studied in this research, around −0.033, has been obtained, which may be another manifestation of the phenomenon that many polymers have similar time/temperature shifts and that their WLF equation constants are approximately the same.
Keyword Nanoindentation
Viscoelastic behavior
Plasticization
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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