Temperature Dependence Studies on Dielectric Relaxation and Electric Dipole Moment of Poly (Ethylene Glycol)

2011 ◽  
Vol 51 (3) ◽  
pp. 393-399 ◽  
Author(s):  
F. M. Sannaningannavar ◽  
Ashok Radder ◽  
B. S. Navati ◽  
N. H. Ayachit ◽  
D. K. Deshpande
Keyword(s):  
Dipole Moment ◽  
Ethylene Glycol ◽  
Temperature Dependence ◽  
Dielectric Relaxation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Poly Ethylene Glycol ◽  
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.

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