Multiple glassy dynamics in dipole functionalized triphenylene-based discotic liquid crystals revealed by broadband dielectric spectroscopy and advanced calorimetry – assessment of the molecular origin

2019 ◽  
Vol 21 (33) ◽  
pp. 18265-18277 ◽  
Author(s):  
Arda Yildirim ◽  
Andrea Bühlmeyer ◽  
Shunsuke Hayashi ◽  
Johannes Christian Haenle ◽  
Kathrin Sentker ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Liquid Crystals ◽  
Phase Behavior ◽  
Dielectric Spectroscopy ◽  
Discotic Liquid Crystals ◽  
Glassy Dynamics ◽  
Broadband Dielectric Spectroscopy ◽  
Molecular Origin

A selected series of dipole functionalized triphenylene-based discotic liquid crystals (DLCs) was synthesized and investigated in a systematic way to reveal the phase behavior and molecular dynamics.

scholarly journals Evidence of Nanostructure Development from the Molecular Dynamics of Poly(pentamethylene 2,5- Furanoate)

2020 ◽  
Author(s):  
Daniel E Martínez-Tong ◽  
Michelina Soccio ◽  
Beatriz Robles-Hernández ◽  
Giulia Guidotti ◽  
Massimo Gazzano ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Infrared Spectroscopy ◽  
Dielectric Spectroscopy ◽  
Thermal History ◽  
Point Of View ◽  
The Other ◽  
Thermal Treatments ◽  
Broadband Dielectric Spectroscopy ◽  
Molecular Origin ◽  
Structural Point

<div><div><div><p>We report on the molecular origin of poly(pentamethylene 2,5-furanoate) particular physical properties. From the structural point of view we found this polymer can develop crystallinity when stored at room conditions for months. On the other hand, we used broadband dielectric spectroscopy (BDS) measurements, to analyze in very detail the local and segmental molecular dynamics of the material subjected to several thermal treatments. In this way we evidenced that the molecular dynamics are sensitive to thermal history over a broad temperature range. This behavior has been attributed to possible inter-chain interactions detected via infrared spectroscopy and rheology measurements in the non-crystallized polymer.</p></div></div></div>

scholarly journals Evidence of Nanostructure Development from the Molecular Dynamics of Poly(pentamethylene 2,5- Furanoate)

2020 ◽  
Author(s):  
Daniel E Martínez-Tong ◽  
Michelina Soccio ◽  
Beatriz Robles-Hernández ◽  
Giulia Guidotti ◽  
Massimo Gazzano ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Infrared Spectroscopy ◽  
Dielectric Spectroscopy ◽  
Thermal History ◽  
Point Of View ◽  
The Other ◽  
Thermal Treatments ◽  
Broadband Dielectric Spectroscopy ◽  
Molecular Origin ◽  
Structural Point

<div><div><div><p>We report on the molecular origin of poly(pentamethylene 2,5-furanoate) particular physical properties. From the structural point of view we found this polymer can develop crystallinity when stored at room conditions for months. On the other hand, we used broadband dielectric spectroscopy (BDS) measurements, to analyze in very detail the local and segmental molecular dynamics of the material subjected to several thermal treatments. In this way we evidenced that the molecular dynamics are sensitive to thermal history over a broad temperature range. This behavior has been attributed to possible inter-chain interactions detected via infrared spectroscopy and rheology measurements in the non-crystallized polymer.</p></div></div></div>

Phase Behavior of a New Class of Anthraquinone-Based Discotic Liquid Crystals

Langmuir ◽  
2017 ◽  
Vol 33 (48) ◽  
pp. 13849-13860 ◽  
Author(s):  
Joydip De ◽  
Santosh Prasad Gupta ◽  
Indu Bala ◽  
Sandeep Kumar ◽  
Santanu Kumar Pal
Keyword(s):  
Liquid Crystals ◽  
Phase Behavior ◽  
Discotic Liquid Crystals ◽  
New Class

scholarly journals Broadband Dielectric Spectroscopy Study of Biobased Poly(alkylene 2,5-furanoate)s’ Molecular Dynamics

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1355 ◽  
Author(s):  
Michelina Soccio ◽  
Daniel E. Martínez-Tong ◽  
Giulia Guidotti ◽  
Beatriz Robles-Hernández ◽  
Andrea Munari ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Dielectric Spectroscopy ◽  
Relaxation Times ◽  
Barrier Properties ◽  
Polymer Processing ◽  
Industrial Applications ◽  
Structure Property ◽  
Property Relations ◽  
Broadband Dielectric Spectroscopy ◽  
Segmental Relaxation

Poly(2,5-alkylene furanoate)s are bio-based, smart, and innovative polymers that are considered the most promising materials to replace oil-based plastics. These polymers can be synthesized using ecofriendly approaches, starting from renewable sources, and result into final products with properties comparable and even better than those presented by their terephthalic counterparts. In this work, we present the molecular dynamics of four 100% bio-based poly(alkylene 2,5-furanoate)s, using broadband dielectric spectroscopy measurements that covered a wide temperature and frequency range. We unveiled complex local relaxations, characterized by the simultaneous presence of two components, which were dependent on thermal treatment. The segmental relaxation showed relaxation times and strengths depending on the glycolic subunit length, which were furthermore confirmed by high-frequency experiments in the molten region of the polymers. Our results allowed determining structure–property relations that are able to provide further understanding about the excellent barrier properties of poly(alkylene 2,5-furanoate)s. In addition, we provide results of high industrial interest during polymer processing for possible industrial applications of poly(alkylene furanoate)s.

Molecular dynamics of poly(butylene tert-butyl isophthalate) and its copolymers with poly(butylene terephthalate) as revealed by broadband dielectric spectroscopy

Polymer ◽  
2006 ◽  
Vol 47 (20) ◽  
pp. 7078-7084 ◽  
Author(s):  
Aurora Nogales ◽  
Alejandro Sanz ◽  
Tiberio A. Ezquerra ◽  
Robert Quintana ◽  
Sebastian Muñoz-Guerra
Keyword(s):  
Molecular Dynamics ◽  
Dielectric Spectroscopy ◽  
Butylene Terephthalate ◽  
Tert Butyl ◽  
Broadband Dielectric Spectroscopy

Molecular dynamics in semifluorinated side-chain polyesters as studied by broadband dielectric spectroscopy

Polymer ◽  
2006 ◽  
Vol 47 (20) ◽  
pp. 7189-7197 ◽  
Author(s):  
Julius Tsuwi ◽  
Lutz Hartmann ◽  
Friedrich Kremer ◽  
Doris Pospiech ◽  
Dieter Jehnichen ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Dielectric Spectroscopy ◽  
Side Chain ◽  
Broadband Dielectric Spectroscopy

scholarly journals A comparative study of nematic liquid crystals doped with harvested and non-harvested ferroelectric nanoparticles: phase transitions and dielectric properties

RSC Advances ◽  
2017 ◽  
Vol 7 (56) ◽  
pp. 35438-35444 ◽  
Author(s):  
Y. Lin ◽  
A. Daoudi ◽  
F. Dubois ◽  
J.-F. Blach ◽  
J.-F. Henninot ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Dielectric Properties ◽  
Comparative Study ◽  
Dielectric Spectroscopy ◽  
Nematic Liquid Crystals ◽  
Broadband Dielectric Spectroscopy

Broadband dielectric spectroscopy is used to determine the dielectric properties and phase transitions of the 4-n-octyl-4′-cyanobiphenyl liquid crystal (8CB) doped with harvested and non-harvested ferroelectric nanoparticles.

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