Influence of Crystallinity in Molecular Motions of Poly(l-lactic acid) Investigated by Dielectric Relaxation Spectroscopy

2008 ◽  
Vol 41 (17) ◽  
pp. 6419-6430 ◽  
Author(s):  
A. R. Brás ◽  
P. Malik ◽  
M. Dionísio ◽  
J. F. Mano
Keyword(s):  
Lactic Acid ◽  
Dielectric Relaxation ◽  
Dielectric Relaxation Spectroscopy ◽  
Molecular Motions

Crystallization of Poly(l-lactic acid) Probed with Dielectric Relaxation Spectroscopy

2006 ◽  
Vol 39 (19) ◽  
pp. 6513-6520 ◽  
Author(s):  
Ana Rita Brás ◽  
María Teresa Viciosa ◽  
Yaming Wang ◽  
Madalena Dionísio ◽  
João F. Mano
Keyword(s):  
Lactic Acid ◽  
Dielectric Relaxation ◽  
Dielectric Relaxation Spectroscopy

Molecular motions near the glass transition in diethylene glycol bis(allyl carbonate) as studied by dielectric relaxation spectroscopy

1996 ◽  
Vol 6 (4) ◽  
pp. 539 ◽  
Author(s):  
Ian K. Smith ◽  
Stuart R. Andrews ◽  
Graham Williams ◽  
Paul A. Holmes
Keyword(s):  
Glass Transition ◽  
Dielectric Relaxation ◽  
Diethylene Glycol ◽  
Dielectric Relaxation Spectroscopy ◽  
Molecular Motions

Molecular motions in glass-rubber transition region in polyisobutylene investigated by two-dimensional correlation dielectric relaxation spectroscopy

2011 ◽  
Vol 99 (12) ◽  
pp. 121902 ◽  
Author(s):  
Xiaoan Wang ◽  
G. S. Huang ◽  
J. R. Wu ◽  
Y. J. Nie ◽  
X. J. He ◽  
...  
Keyword(s):  
Dielectric Relaxation ◽  
Transition Region ◽  
Two Dimensional ◽  
Dielectric Relaxation Spectroscopy ◽  
Molecular Motions

scholarly journals Molecular Motions in Chitosan Studied by Dielectric Relaxation Spectroscopy

2004 ◽  
Vol 5 (5) ◽  
pp. 2073-2078 ◽  
Author(s):  
M. T. Viciosa ◽  
M. Dionísio ◽  
R. M. Silva ◽  
R. L. Reis ◽  
J. F. Mano
Keyword(s):  
Dielectric Relaxation ◽  
Dielectric Relaxation Spectroscopy ◽  
Molecular Motions

scholarly journals Studies of Polymer Solvation by Dielectric Relaxation Spectroscopy III: Polyvinyl Pyrrolidone in N-Methyl-2-Pyrrolidone, Ethanediol, Methanol, and Water

1990 ◽  
Vol 45 (2) ◽  
pp. 126-134
Author(s):  
E. Dachwitz
Keyword(s):  
Dielectric Relaxation ◽  
Chain Length ◽  
Molar Mass ◽  
Polyvinyl Pyrrolidone ◽  
Dielectric Relaxation Spectroscopy ◽  
Length Effect ◽  
Repeat Units ◽  
Solvent Model ◽  
Spectral Components ◽  
High Concentrations

AbstractThe permittivity of the title solutions has been measured at frequencies between some MHz and 72 GHz at 20 °C. Polyvinyl pyrrolidone of relative molar mass ranging from 1200 to 360 000 has been used. Referring to the concentration of monomeric repeat units (x = 0.65 maximum) there is no significant chain length effect. The permittivity data are described in terms of discrete Debye type spectral components. Special attention is paid to the contributions ascribable to the solvents, which are discussed with respect to their solvation behaviour. This can be described by a three state solvent model as follows. Besides the "bulk" solvent a further contribution is found in any case which is due to loosely affected (slowed down) solvent. Moreover a part of the solvent appears to be tightly bound to the polymer at high concentrations. All the solvents considered show similar solvation properties, notwithstanding their different tendencies towards selfassociation.

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