Positron Annihilation Studies of the Free Volumes in Nylon12/PVA Films Treated by Supercritical Carbon Dioxide

• Authors: Jingjing Li , Chongshan Yin , Yawei Zhou , Gang Li , Jen-taut Yeh , Chunqing He
• Languages of publication: EN

Abstracts

EN

Free volume variations of Nylon12/Polyvinyl alcohol (Nylon12/PVA) blends treated in supercritical carbon dioxide (ScCO₂) were investigated using positron annihilation lifetime spectroscopy. It is found that o-Ps lifetime τ₃ and the corresponding intensity I₃ in Nylon12/PVA decrease with increase of the PVA content. Being treated in ScCO₂ at 50°C and 20 MPa for 1 h, the free volume holes in Nylon12/PVA blends expand to different extents depending on the weight ratio of PVA. After releasing of CO₂, the free volume size decreases as a function of the elapsed time due to the molecular relaxation, and the relaxation time constant depends on the content of PVA in the blends.

Keywords

EN

Nylon12/PVA; ScCO₂; positron annihilation; free volume; relaxation

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 5
• Pages: 1552-1555

Dates

published

2017-11

Contributors

author

Jingjing Li

• Key Laboratory of Nuclear Solid State Physics, Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China

author

Chongshan Yin

• Key Laboratory of Nuclear Solid State Physics, Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China

author

Yawei Zhou

• Key Laboratory of Nuclear Solid State Physics, Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China

author

Gang Li

• Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan, China

author

Jen-taut Yeh

• Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education, Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan, China

author

Chunqing He

• Key Laboratory of Nuclear Solid State Physics, Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China

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Identifiers

DOI

10.12693/APhysPolA.132.1552