Dielectric and Viscoelastic Investigation of Segmental Dynamics of Polystyrene above Glass Transition Temperature: Cooperative Sequence Length and Relaxation Mode Distribution

2011 ◽  
Vol 44 (11) ◽  
pp. 4355-4365 ◽  
Author(s):  
Yumi Matsumiya ◽  
Akiko Uno ◽  
Hiroshi Watanabe ◽  
Tadashi Inoue ◽  
Osamu Urakawa
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Sequence Length ◽  
Relaxation Mode ◽  
Segmental Dynamics

Effects of sequence length distribution on heat capacity and glass transition temperature of styrene—methyl methacrylate copolymers

Polymer ◽  
1994 ◽  
Vol 35 (17) ◽  
pp. 3698-3702 ◽  
Author(s):  
Hidematsu Suzuki ◽  
Yoshiyuki Nishio ◽  
Noritaka Kimura ◽  
V.B.F. Mathot ◽  
M.F.J. Pijpers ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Methyl Methacrylate ◽  
Length Distribution ◽  
Sequence Length ◽  
Methacrylate Copolymers

Effects of counterion size and backbone rigidity on the dynamics of ionic polymer melts and glasses

2017 ◽  
Vol 19 (40) ◽  
pp. 27442-27451 ◽  
Author(s):  
Yao Fu ◽  
Vera Bocharova ◽  
Mengze Ma ◽  
Alexei P. Sokolov ◽  
Bobby G. Sumpter ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Melts ◽  
Static Dielectric Constant ◽  
Segmental Dynamics ◽  
Ionic Polymer ◽  
Segmental Relaxation

Backbone rigidity, counterion size and the static dielectric constant affect the glass transition temperature, segmental relaxation time and decoupling between counterion and segmental dynamics in significant manners.

Fast Dynamics in Glass-Forming Polymers Revisited

1996 ◽  
Vol 455 ◽  
Author(s):  
J. Colmenero ◽  
A. Arbe ◽  
C. Mijangos ◽  
H. Reinecke
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Supercooled Liquid ◽  
Time Range ◽  
Time Behavior ◽  
Exponential Behavior ◽  
Segmental Dynamics ◽  
Glass Forming ◽  
Short Time

ABSTRACTThe so called “fast-dynamics” of glass-forming systems as observed by time of flight (TOF) neutron scattering techniques is revisited. TOF-results corresponding to several glass-forming polymers with different chemical microstructure and glass-transition temperature are presented together with the theoretical framework proposed by us to interpret these results. The main conclusion is that the TOF-data can be explained in terms of quasiharmonic vibrations and the particular short time behavior of the segmental dynamics. The segmental dynamics display in the very short time range (t ≈ 2 ps) a crossover from a simple exponential behavior towards a non-exponential regime. The first exponential decay, which is controlled by C-C rotational barriers, can be understood as a trace of the behavior of the system in absence of the effects (correlations, cooperativity, memory effects…) which characterize the dense supercooled liquid like state against the normal liquid state. The non-exponential regime at t > 2 ps corresponds to what is usually understood as α and β relaxations. Some implications of these results are also discussed.

scholarly journals Dynamics of poly(vinyl butyral) studied using dielectric spectroscopy and 1H NMR relaxometry

2017 ◽  
Vol 19 (47) ◽  
pp. 31804-31812 ◽  
Author(s):  
Silvia Pizzanelli ◽  
Daniele Prevosto ◽  
Massimiliano Labardi ◽  
Tommaso Guazzini ◽  
Simona Bronco ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
1H Nmr ◽  
Dielectric Spectroscopy ◽  
Segmental Dynamics ◽  
Nmr Relaxometry ◽  
Vinyl Butyral ◽  
1H Nmr Relaxometry

Dielectric spectroscopy and NMR relaxometry unveiled the PVB segmental dynamics across the glass transition temperature.

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