Depth Profile of Free Volume in a Mixture and Copolymers of Poly(N-vinyl-pyrrolidone) and Poly(ethylene glycol) Studied by Positron Annihilation Spectroscopy

2003 ◽  
Vol 4 (6) ◽  
pp. 1856-1864 ◽  
Author(s):  
Y. Li ◽  
R. Zhang ◽  
H. Chen ◽  
J. Zhang ◽  
R. Suzuki ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Positron Annihilation ◽  
Free Volume ◽  
Depth Profile ◽  
Positron Annihilation Spectroscopy ◽  
Vinyl Pyrrolidone ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Self-diffusion in poly( N? -vinyl pyrrolidone) - poly(ethylene glycol) systems

2001 ◽  
Vol 279 (6) ◽  
pp. 532-538 ◽  
Author(s):  
R. S. Vartapetian ◽  
E. V. Khozina ◽  
J. K�rger ◽  
D. Geschke ◽  
F. Rittig ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Vinyl Pyrrolidone ◽  
Poly Ethylene Glycol ◽  
Self Diffusion ◽  
Poly Ethylene

Positronium Lifetime Study on Subnanoscopic Structure of Polyrotaxane

2012 ◽  
Vol 733 ◽  
pp. 167-170
Author(s):  
K. Ito ◽  
Chang Ming Zhao ◽  
Kohzo Ito ◽  
Yoshinori Kobayashi
Keyword(s):  
Ethylene Glycol ◽  
Temperature Dependence ◽  
Positron Annihilation ◽  
Chemical Structure ◽  
Poly Ethylene Glycol ◽  
Positron Annihilation Lifetime ◽  
Positronium Lifetime ◽  
End Groups ◽  
Poly Ethylene ◽  
Free Volume Hole

The subnanoscopic structures of polyrotaxanes, prepared from α-cyclodextrins, poly(ethylene glycol), and bulky adamantane end groups, were examined by means of the positron annihilation lifetime technique, in consideration of the free-volume hole, quantified from the long-lived ortho-positronium (o-Ps) lifetimes. The influence of the chemical structure on the temperature dependence of the o-Ps lifetimes are discussed.

The Depth Profile of Free Volume in Drug Delivery Polymers Studied by Positron Annihilation Spectroscopy

2004 ◽  
Vol 445-446 ◽  
pp. 319-321 ◽  
Author(s):  
Ying Li ◽  
R. Zhang ◽  
H. Chen ◽  
J. Zhang ◽  
Ryoichi Suzuki ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Positron Annihilation ◽  
Free Volume ◽  
Depth Profile ◽  
Positron Annihilation Spectroscopy
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