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.

Plasticization of poly(vinyl butyral) by water: Glass transition temperature and mechanical properties

2018 ◽  
Vol 136 (12) ◽  
pp. 47230 ◽  
Author(s):  
Marlène Desloir ◽  
Cyril Benoit ◽  
Amine Bendaoud ◽  
Pierre Alcouffe ◽  
Christian Carrot
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Water Glass ◽  
Vinyl Butyral

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.

Novel Copolymers of N-[(4-bromo-3,5- difluorine) phenyl] acryl- amide with Methyl Methacrylate: Synthesis, Characterization and Thermal Properties

2013 ◽  
Vol 750-752 ◽  
pp. 1125-1129
Author(s):  
Xin Ding Yao ◽  
Rui Na Fang ◽  
Hong Jian Pang ◽  
Zong Wu Wang ◽  
Guo Ji Liu
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermogravimetric Analysis ◽  
Methyl Methacrylate ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Thermal Stability Of

Copolymers of N-[(4-bromo-3,5-difluorine) phenyacrylamide (BDPA), with methyl methacrylate (MMA) were synthesized in N,N-Dimethylformamide at 75±1°C using 2,2-azobisisobutyronitrile (AIBN) as an initiator with different monomer-to-monomer ratios in the feed. The copolymers were characterized by FTIR and 1H NMR spectra. The glass transition temperature of the copolymers decreases with increase in BDPA content. The thermogravimetric analysis of the polymers showed that the thermal stability of the copolymer decreases with BDPA content.

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