- Tytuł:
- Positron Annihilation Studies of the Free Volumes in Nylon12/PVA Films Treated by Supercritical Carbon Dioxide
- Autorzy:
-
Li, Jingjing
Yin, Chongshan
Zhou, Yawei
Li, Gang
Yeh, Jen-taut
He, Chunqing - Powiązania:
- https://bibliotekanauki.pl/articles/1033920.pdf
- Data publikacji:
- 2017-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
Nylon12/PVA
ScCO₂
positron annihilation
free volume
relaxation - Opis:
- 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.
- Źródło:
-
Acta Physica Polonica A; 2017, 132, 5; 1552-1555
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł