Dynamic and free volume aspects of spin probe TEMPO in organic glass formers: Polymer cis-1,4-poly(isoprene)

2018 ◽  
Author(s):  
Helena Švajdlenková ◽  
Ondrej Šauša ◽  
Katarína Čechová ◽  
Josef Bartoš
Keyword(s):  
Free Volume ◽  
Spin Probe ◽  
Organic Glass

scholarly journals On the Mutual Relationships between Molecular Probe Mobility and Free Volume and Polymer Dynamics in Organic Glass Formers: cis-1,4-poly(isoprene)

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 294
Author(s):  
Helena Švajdlenková ◽  
Ondrej Šauša ◽  
Sergey V. Adichtchev ◽  
Nikolay V. Surovtsev ◽  
Vladimir N. Novikov ◽  
...  
Keyword(s):  
Free Volume ◽  
Spin Probe ◽  
Hyperfine Coupling Constant ◽  
Organic Glass ◽  
Molecular Probe ◽  
Positron Annihilation Lifetime ◽  
Broadband Dielectric Spectroscopy ◽  
Relaxation Modes ◽  
Reorientation Dynamics ◽  
In Cis

We report on the reorientation dynamics of small spin probe 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) in cis-1,4-poly(isoprene) (cis-1,4-PIP10k) from electron spin resonance (ESR) and the free volume of cis-1,4-PIP10k from positron annihilation lifetime spectroscopy (PALS) in relation to the high-frequency relaxations of cis-1,4-PIP10k using light scattering (LS) as well as to the slow and fast processes from broadband dielectric spectroscopy (BDS) and neutron scattering (NS). The hyperfine coupling constant, 2Azz′(T), and the correlation times, τc(T), of cis-1,4-PIP10k/TEMPO system as a function of temperature exhibit several regions of the distinct spin probe TEMPO dynamics over a wide temperature range from 100 K up to 350 K. The characteristic ESR temperatures of changes in the spin probe dynamics in cis-1,4-PIP10k/TEMPO system are closely related to the characteristic PALS ones reflecting changes in the free volume expansion from PALS measurement. Finally, the time scales of the slow and fast dynamics of TEMPO in cis-1,4-PIP10k are compared with all of the six known slow and fast relaxation modes from BDS, LS and NS techniques with the aim to discuss the controlling factors of the spin probe reorientation mobility in polymer, oligomer and small molecular organic glass-formers.

scholarly journals Molecular dynamic heterogeneity in relation to free volume and relaxation dynamics in organic glass-formers: oligomeric cis-1,4-poly(isoprene)

2017 ◽  
Vol 19 (23) ◽  
pp. 15215-15226 ◽  
Author(s):  
H. Švajdlenková ◽  
S. Arrese-Igor ◽  
Z. Nógellová ◽  
A. Alegría ◽  
J. Bartoš
Keyword(s):  
Molecular Dynamic ◽  
Free Volume ◽  
Molecular Rotation ◽  
Organic Glass ◽  
Relaxation Dynamics ◽  
Dynamic Heterogeneity ◽  
Host Medium ◽  
Rotation Dynamics

Herein, a combined study of the molecular rotation dynamics and free volume in cis-1,4-poly(isoprene) using two external probing techniques via ESR and PALS together with relaxation dynamics of the host medium via BDS is presented.

Spin probe dynamics in relation to free volume in crystalline organics from ESR and PALS: Cyclohexane

2016 ◽  
Vol 643 ◽  
pp. 98-102 ◽  
Author(s):  
H. Švajdlenková ◽  
B. Zgardzinska ◽  
M. Lukešová ◽  
J. Bartoš
Keyword(s):  
Free Volume ◽  
Spin Probe

The Spin Probe Dynamics and the Free Volume in a Series of Amorphous Polymer Glass-Formers

2011 ◽  
Vol 305 (1) ◽  
pp. 108-115 ◽  
Author(s):  
H. Švajdlenková ◽  
M. Iskrová ◽  
O. Šauša ◽  
G. Dlubek ◽  
J. Krištiak ◽  
...  
Keyword(s):  
Free Volume ◽  
Spin Probe ◽  
Amorphous Polymer ◽  
Polymer Glass

Molecular probe dynamics and free volume in organic glass-formers and their relationships to structural relaxation: 1-propanol

2015 ◽  
Vol 28 (1) ◽  
pp. 015101 ◽  
Author(s):  
J Bartoš ◽  
H Švajdlenková ◽  
O Šauša ◽  
M Lukešová ◽  
D Ehlers ◽  
...  
Keyword(s):  
Free Volume ◽  
Structural Relaxation ◽  
Organic Glass ◽  
Molecular Probe

Spin probe dynamics in relation to free volume in crystalline organics from ESR and PALS: N-tridecane

2015 ◽  
Vol 476 ◽  
pp. 100-108 ◽  
Author(s):  
M. Lukešová ◽  
B. Zgardzinska ◽  
H. Švajdlenková ◽  
R. Zaleski ◽  
B. Charmas ◽  
...  
Keyword(s):  
Free Volume ◽  
Spin Probe
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