Dielectric relaxation of polymers: segmental dynamics under structural constraints

Soft Matter ◽  
2016 ◽  
Vol 12 (37) ◽  
pp. 7709-7725 ◽  
Author(s):  
Angel Alegria ◽  
Juan Colmenero
Keyword(s):  
Dielectric Relaxation ◽  
Structural Constraints ◽  
Segmental Dynamics ◽  
Segmental Motions

The effects of structural constraints on the main dielectric relaxation associated to segmental motions of polymer based materials are reviewed.

scholarly journals Effect of soft segment molecular weight on the glass transition, crystallinity, molecular mobility and segmental dynamics of poly(ethylene oxide) based poly(urethane–urea) copolymers

RSC Advances ◽  
2017 ◽  
Vol 7 (65) ◽  
pp. 40745-40754 ◽  
Author(s):  
Oguzhan Oguz ◽  
Stefanos A. Koutsoumpis ◽  
Eren Simsek ◽  
Emel Yilgor ◽  
Iskender Yilgor ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Ethylene Oxide ◽  
Dielectric Relaxation ◽  
Molecular Mobility ◽  
Soft Segment ◽  
Dielectric Relaxation Spectroscopy ◽  
Segmental Dynamics ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The effect of poly(ethylene oxide) (PEO) soft segment molecular weight (Mn= 2000, 4600, 8000 g mol−1) molecular mobility and segmental dynamics of a series of polyurethane–urea copolymers (PU) was investigated by dielectric relaxation spectroscopy.

Dynamics of a bioinert polymer in hydrated states by dielectric relaxation spectroscopy

2017 ◽  
Vol 19 (2) ◽  
pp. 1389-1394 ◽  
Author(s):  
Toyoaki Hirata ◽  
Hisao Matsuno ◽  
Daisuke Kawaguchi ◽  
Manabu Inutsuka ◽  
Tomoyasu Hirai ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Side Chain ◽  
Water Interface ◽  
Dielectric Relaxation Spectroscopy ◽  
Segmental Dynamics ◽  
Side Chain Motion

The segmental dynamics of poly(2-methoxyethyl acrylate) at the water interface is extremely faster and comparable to the side chain motion.

Segmental motions of cis-polyisoprene in the bulk state: interpretation of dielectric relaxation data

1992 ◽  
Vol 25 (2) ◽  
pp. 816-825 ◽  
Author(s):  
I. Bahar ◽  
B. Erman ◽  
F. Kremer ◽  
E. W. Fischer
Keyword(s):  
Dielectric Relaxation ◽  
Relaxation Data ◽  
Bulk State ◽  
State Interpretation ◽  
Segmental Motions

Heterogeneity of the Segmental Dynamics of Poly(dimethylsiloxane) in a Diblock Lamellar Mesophase:  Dielectric Relaxation Investigations

2004 ◽  
Vol 37 (20) ◽  
pp. 7808-7817 ◽  
Author(s):  
C. Lorthioir ◽  
A. Alegría ◽  
J. Colmenero ◽  
B. Deloche
Keyword(s):  
Dielectric Relaxation ◽  
Segmental Dynamics

Dielectric Relaxation in Liquid Crystalline/Isotropic Block Copolymers:  Effect of Nanoscale Confinement on the Segmental Dynamics

2002 ◽  
Vol 35 (22) ◽  
pp. 8521-8530 ◽  
Author(s):  
Sergei Zhukov ◽  
Steffen Geppert ◽  
Bernd Stühn ◽  
Rosina Staneva ◽  
Rouja Ivanova ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Dielectric Relaxation ◽  
Liquid Crystalline ◽  
Segmental Dynamics

scholarly journals Confinement Effects on The Local Motion in Nanocomposites

1998 ◽  
Vol 543 ◽  
Author(s):  
S. H. Anastasiadis ◽  
K. Karatasos ◽  
G. Vlachos ◽  
E. Manias ◽  
E. P. Giannelis
Keyword(s):  
Dielectric Relaxation ◽  
Interlayer Spacing ◽  
Dielectric Relaxation Spectroscopy ◽  
Local Motion ◽  
Relaxation Mode ◽  
Segmental Dynamics ◽  
Organically Modified Silicates ◽  
Organically Modified ◽  
Reorientational Dynamics ◽  
Methyl Phenyl

AbstractThe local segmental dynamics of polymers confined within the 15–20 Å interlayer spacing of nanocomposites consisting of poly(methyl phenyl siloxane) intercalated within organically modified silicates, has been investigated utilizing Dielectric Relaxation Spectroscopy. The effect of confinement on the local reorientational dynamics is evident by the observation of a relaxation mode, which is much faster than the segmental α-relaxation of the bulk polymer and exhibits much weaker temperature dependence. This is attributed to the restrictions placed by the interlayer spacing on the cooperative volume required for the ax-relaxation.

STRUCTURAL CONSTRAINTS ON COGNITIVE THEORY

1980 ◽  
Vol 25 (2) ◽  
pp. 203-204
Author(s):  
JOSEPH M. SCANDURA
Keyword(s):  
Cognitive Theory ◽  
Structural Constraints
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