Temperature Dependence of Relaxation in Polypropylene and Poly(ethylene-co-propylene)

1996 ◽  
Vol 29 (10) ◽  
pp. 3651-3653 ◽  
Author(s):  
P. G. Santangelo ◽  
K. L. Ngai ◽  
C. M. Roland
Keyword(s):  
Temperature Dependence ◽  
Poly Ethylene

Temperature dependence of the unperturbed dimensions of alternating poly(ethylene-propylene)

1992 ◽  
Vol 25 (2) ◽  
pp. 954-960 ◽  
Author(s):  
A. Zirkel ◽  
D. Richter ◽  
W. Pyckhout-Hintzen ◽  
L. J. Fetters
Keyword(s):  
Temperature Dependence ◽  
Ethylene Propylene ◽  
Unperturbed Dimensions ◽  
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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