Dielectric Study on the Heterogeneous Dynamics of Miscible Polyisoprene/Poly(vinyl ethylene) Blends:  Estimation of the Relevant Length Scales for the Segmental Relaxation Dynamics

2003 ◽  
Vol 36 (10) ◽  
pp. 3699-3708 ◽  
Author(s):  
Yuji Hirose ◽  
Osamu Urakawa ◽  
Keiichiro Adachi
Keyword(s):  
Dielectric Study ◽  
Relaxation Dynamics ◽  
Length Scales ◽  
Heterogeneous Dynamics ◽  
Segmental Relaxation

The ionic transport mechanism and coupling between the ion conduction and segmental relaxation processes of PEO20-LiCF3SO3 based ion conducting polymer clay composites

2016 ◽  
Vol 18 (29) ◽  
pp. 19955-19965 ◽  
Author(s):  
Tapabrata Dam ◽  
Sidhartha S. Jena ◽  
Dillip K. Pradhan
Keyword(s):  
Conducting Polymer ◽  
Relaxation Processes ◽  
Relaxation Dynamics ◽  
Ion Conduction ◽  
Thermally Activated ◽  
Segmental Relaxation ◽  
Ion Conducting ◽  
Ion Conduction Mechanism ◽  
Insight Into ◽  
Ion Conducting Polymer

An insight into thermally activated ion-hopping, relaxation dynamics and the coupled ion-conduction mechanism observed in ion-conducting polymer clay composites.

Single Molecule Probing of the Local Segmental Relaxation Dynamics in Polymer above the Glass Transition Temperature

2009 ◽  
Vol 131 (34) ◽  
pp. 12201-12210 ◽  
Author(s):  
Els Braeken ◽  
Gert De Cremer ◽  
Philippe Marsal ◽  
Gérard Pèpe ◽  
Klaus Müllen ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Single Molecule ◽  
Relaxation Dynamics ◽  
Segmental Relaxation

Orientational relaxation of ring polymers in dilute solutions

Soft Matter ◽  
2019 ◽  
Author(s):  
Manisha Handa ◽  
Parbati Biswas
Keyword(s):  
Relaxation Dynamics ◽  
Dilute Solutions ◽  
Orientational Relaxation ◽  
Segmental Relaxation ◽  
Ring Polymers ◽  
Short Times

The segmental relaxation dynamics of ring polymers in dilute solutions ranges from the fast local motions at short times, decelerated due to HI to the global motions at long times, enhanced due to HI, irrespective of the size.

Segmental Relaxation Dynamics of the Core and Corona in a Single Dry Micelle

2017 ◽  
Vol 51 (1) ◽  
pp. 195-203 ◽  
Author(s):  
Weizhao Ren ◽  
Yuping Wang ◽  
Xin Chen ◽  
Biao Zuo ◽  
Xianjing Zhou ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
The Core ◽  
Segmental Relaxation

Heterogeneous dynamics, correlated time and length scales in ionic deep eutectics: Anion and temperature dependence

2020 ◽  
Vol 153 (23) ◽  
pp. 234502
Author(s):  
Swarup Banerjee ◽  
Pradip Kr. Ghorai ◽  
Suman Das ◽  
Juriti Rajbangshi ◽  
Ranjit Biswas
Keyword(s):  
Temperature Dependence ◽  
Length Scales ◽  
Heterogeneous Dynamics

scholarly journals Opposite Effects of SiO2 Nanoparticles on the Local α and Larger-Scale α’ Segmental Relaxation Dynamics of PMMA Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 979 ◽  
Author(s):  
Na Wang ◽  
Xuebang Wu ◽  
C.S. Liu
Keyword(s):  
Physical Adsorption ◽  
Sio2 Nanoparticles ◽  
Peak Height ◽  
Polymer Chains ◽  
Relaxation Dynamics ◽  
Mechanical Spectroscopy ◽  
Adsorption Effect ◽  
Nanoparticle Agglomeration ◽  
Segmental Relaxation ◽  
Opposite Behavior

The segmental relaxation dynamics of poly(methyl methacrylate)/silica (PMMA/SiO2) nanocomposites with different compositions ( ϕ SiO 2 ) near and above the glass transition temperature were investigated by mechanical spectroscopy. At ϕ SiO 2 ≤ 0.5%, the α peak temperature hardly changes with ϕ SiO 2 , but that of α’ relaxation composed of Rouse and sub-Rouse modes decreases by 15 °C due to the increase of free volume. At ϕ SiO 2 ≥ 0.7%, both α and α’ relaxations shift to high temperatures because of the steric hindrance introduced by nanoparticle agglomeration. On the other hand, with increasing ϕ SiO 2 , the peak height for α relaxation increases at ϕ SiO 2 ≤ 0.5% and then decreases at ϕ SiO 2 ≥ 0.7%, but that for α’ relaxation shows an opposite behavior. This is because at low ϕ SiO 2 , the short-chain segments related to α relaxation can easily bypass the particles, but the longer-chain segments related to α’ relaxation cannot. At high ϕ SiO 2 , the polymer chains were bound to the nanoparticles due to the physical adsorption effect, leading to the decrease of relaxation unit concentration involved in α relaxation. However, the dissociation of those bonds with heating and the concentration heterogeneity of polymer chains result in the increase of peak height for α’ relaxation.

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