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Nanoindentation creep in polycarbonate and syndiotactic polystyrene

Published online by Cambridge University Press:  29 February 2012

Chien-Chao Huang ,
Mao-Kuo Wei ,
Julie P. Harmon  and
Sanboh Lee
Chien-Chao Huang
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
Mao-Kuo Wei
Affiliation:
Department of Materials Science and Engineering, National Dong Hwa University, Hualien 97401, Taiwan
Julie P. Harmon
Affiliation:
Department of Chemistry, University of South Florida, Tampa, Florida 33620-5250
Sanboh Lee*
Affiliation:
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
*
a)Address all correspondence to this author. e-mail: sblee@mx.nthu.edu.tw
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Abstract

This study focuses on nanoindentation creep in polycarbonate (PC) and syndiotactic polystyrene (sPS) throughout the transient and steady-state regions. The viscoelastic Burgers model is used to explain transient creep data, while the power-law creep model is used to interpret steady-state creep data. The Newtonian shear viscosity of the Maxwell element and Young’s modulus of the Kelvin element are greater for the creep period than for the preload period, and an opposite trend is noted in the Newtonian shear viscosity of the Kelvin element and Young’s modulus of the Maxwell element. The fact that the Young’s moduli of Maxwell and Kelvin elements in the creep period are different from those in the preload period implies that a stress-induced mesomorphic structure forms or that crystallization occurs in nanoindentation creep. While the strain rate increases with decreasing preload period, the stress exponent factor is almost the same for all preload periods.

Keywords

Stress/strain relationshipPolymerNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 21 , 14 November 2012 , pp. 2746 - 2751
Copyright
Copyright © Materials Research Society 2012

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