Relaxation of Free Volume in Polycarbonate and Polystyrene Studied by Positron Annihilation Lifetime Spectroscopy

• Authors: D. Cangialosi , M. Wübbenhorst , H. Schut , S. Picken
• Languages of publication: EN

Abstracts

EN

We present the time evolution of polycarbonate and polystyrene free volume probed by positron annihilation lifetime spectroscopy, which occurs after thermal rejuvenation above the glass transition temperature (T_g) and after plastic deformation via cold rolling. The ortho-positronium (τ_{o-Ps}) lifetime and its intensity (I_{o-Ps}) are used to characterise, respectively, size and concentration of the free volume holes. Our results suggest that the effect of plastic deformation on the polymer microstructure is far different from that of a thermally rejuvenated sample contrarily to common beliefs. In particular, plastic deformation results in an increase inτ_{o-Ps} and a decrease in I_{o-Ps}, whereas rejuvenation above T_g results in an increase in I_{o-Ps} whileτ_{o-Ps} remains unchanged. In addition, physical aging below T_g after plastic deformation manifests as a reduction of τ_{o-Ps}, whereas a decrease in I_{o-Ps} is observed after thermal rejuvenation. These results corroborate the idea of an amorphous-amorphous transition induced by plastic deformation.

Keywords

EN

78.70.Bj; 82.35.Lr; 64.70.Kb

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 82.35.Lr: Physical properties of polymers

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 4
• Pages: 690-696

Dates

published

2005-04

received

2004-09-20

Contributors

author

D. Cangialosi

• Dept. of Polymer Materials and Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

author

M. Wübbenhorst

• Dept. of Polymer Materials and Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

author

H. Schut

• Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB, Delft, The Netherlands

author

S. Picken

• Dept. of Polymer Materials and Engineering, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

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Identifiers

DOI

10.12693/APhysPolA.107.690