scholarly journals Photo-responsive liquid crystalline epoxy networks with exchangeable disulfide bonds

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37248-37254 ◽  
Author(s):  
Yuzhan Li ◽  
Yuehong Zhang ◽  
Orlando Rios ◽  
Jong K. Keum ◽  
Michael R. Kessler
Keyword(s):  
Disulfide Bonds ◽  
Liquid Crystalline ◽  
Epoxy Networks ◽  
Disulfide Exchange ◽  
Liquid Crystalline Epoxy ◽  
Interchange Reactions

Disulfide exchange and thiol–disulfide interchange reactions allow for reprocessing and recycling of azobenzene-based liquid crystalline networks.

scholarly journals Liquid crystalline epoxy networks with exchangeable disulfide bonds

Soft Matter ◽  
2017 ◽  
Vol 13 (29) ◽  
pp. 5021-5027 ◽  
Author(s):  
Yuzhan Li ◽  
Yuehong Zhang ◽  
Orlando Rios ◽  
Jong K. Keum ◽  
Michael R. Kessler
Keyword(s):  
Shape Memory ◽  
Disulfide Bonds ◽  
Liquid Crystalline ◽  
Epoxy Networks ◽  
Liquid Crystalline Epoxy

Reprocessable shape memory liquid crystalline epoxy networks were synthesized.

scholarly journals Photoresponsive Liquid Crystalline Epoxy Networks with Shape Memory Behavior and Dynamic Ester Bonds

2016 ◽  
Vol 8 (24) ◽  
pp. 15750-15757 ◽  
Author(s):  
Yuzhan Li ◽  
Orlando Rios ◽  
Jong K. Keum ◽  
Jihua Chen ◽  
Michael R. Kessler
Keyword(s):  
Shape Memory ◽  
Liquid Crystalline ◽  
Epoxy Networks ◽  
Shape Memory Behavior ◽  
Liquid Crystalline Epoxy

scholarly journals Functional liquid crystalline epoxy networks and composites: from materials design to applications

2021 ◽  
pp. 1-29
Author(s):  
Yuzhan Li ◽  
Veronica Ambrogi ◽  
Pierfrancesco Cerruti ◽  
Monojoy Goswami ◽  
Zhou Yang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Materials Design ◽  
Epoxy Networks ◽  
Liquid Crystalline Epoxy

Thermomechanical properties of liquid-crystalline epoxy networks arranged by a magnetic field

2004 ◽  
Vol 42 (5) ◽  
pp. 758-765 ◽  
Author(s):  
Miyuki Harada ◽  
Mitsukazu Ochi ◽  
Masayuki Tobita ◽  
Tohru Kimura ◽  
Tsukasa Ishigaki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Liquid Crystalline ◽  
Thermomechanical Properties ◽  
Epoxy Networks ◽  
Liquid Crystalline Epoxy

Curing and Alignment of Liquid Crystalline Epoxy Networks

1990 ◽  
Vol 203 ◽  
Author(s):  
C. K. Ober ◽  
G. G. Barclay ◽  
K I. Papathomas ◽  
D. W. Wang
Keyword(s):  
Liquid Crystalline ◽  
Coefficient Of Thermal Expansion ◽  
Wide Angle ◽  
Curing Process ◽  
X Ray Diffraction ◽  
Field Orientation ◽  
Magnetic Field Orientation ◽  
X Ray ◽  
Epoxy Networks ◽  
Liquid Crystalline Epoxy

ABSTRACTLiquid crystalline epoxy networks have been prepared from glycidyl terminated polyether oligomers of varying molecular weight. These oligomers were prepared by functionalizing hydroxy terminated oligomers based on 4,4'- dihydroxy-α-methylstilbene and α,ω-dibromoalkanes with glycidyl groups. Curing of these oligomers was carried out either within their nematic mesophase or in their isotropic state. Different thermal properties were observed after curing under these two sets of conditions. Extremely low values of the coefficient of thermal expansion in the range of 15 to 60 ppm/°C were achieved. To produce aligned thermosets, orientation of the liquid crystalline phase was induced during the curing process by a magnetic field. Orientation of these networks was measured by wide angle x-ray diffraction (WAXD).

scholarly journals Curing Reaction and Dielectric Properties of Rigid and Elastic Liquid Crystal Epoxy Networks Modified with Nanofillers

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Magdalena Włodarska
Keyword(s):  
Glass Transition ◽  
Dielectric Properties ◽  
Liquid Crystalline ◽  
Polymer Networks ◽  
Calorimetric Study ◽  
Pimelic Acid ◽  
Good Tool ◽  
Epoxy Networks ◽  
Curing Reaction ◽  
Liquid Crystalline Epoxy

The aim of the paper is to compare the progress of the curing reaction and the dielectric properties of liquid crystalline epoxy networks of different elasticity and to investigate how modification with nanofillers influences their properties. The study focuses on a liquid crystalline epoxy monomer with four aromatic rings in the mesogen, cross-linked with 4,4′-diaminodiphenylmethane (DDM) and pimelic acid (PA) to produce rigid and elastic polymer networks. The obtained results are compared to networks modified with nanofillers (diphenyl aluminum phosphate nanorods). The curing process is monitored in situ with broadband dielectric spectroscopy, which is a good tool to view the progress of the reaction. Two stages with different reaction dynamics are observed in the studied cases. Dielectric properties of the products cured with two chosen agents show significant differences in the obtained parameters (activation energy, glass transition, and fragility index) as well as in the dynamics of the α and β relaxations. Although the curing agent is the main factor determining the properties of the product, the nanofiller additive also modifies the values of specific parameters that characterize both the process of the reaction and the properties of the final composites. Particularly, adding the nanofiller raises the glass transition temperature in both the cases. The obtained results are in good agreement with the earlier calorimetric study.

scholarly journals Advances in Liquid Crystalline Epoxy Resins for High Thermal Conductivity

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1302
Author(s):  
Younggi Hong ◽  
Munju Goh
Keyword(s):  
Thermal Conductivity ◽  
Network Structure ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Random Network ◽  
Three Dimensional ◽  
Heat Insulator ◽  
Liquid Crystalline Epoxy ◽  
Thermally Conductive ◽  
Substantial Interest

Epoxy resin (EP) is one of the most famous thermoset materials. In general, because EP has a three-dimensional random network, it possesses thermal properties similar to those of a typical heat insulator. Recently, there has been substantial interest in controlling the network structure of EP to create new functionalities. Indeed, the modified EP, represented as liquid crystalline epoxy (LCE), is considered promising for producing novel functionalities, which cannot be obtained from conventional EPs, by replacing the random network structure with an oriented one. In this paper, we review the current progress in the field of LCEs and their application to highly thermally conductive composite materials.

The effect of stoichiometry on the fracture toughness of a liquid crystalline epoxy

2002 ◽  
Vol 42 (2) ◽  
pp. 269-279 ◽  
Author(s):  
Elizabeth J. Robinson ◽  
Elliot P. Douglas ◽  
John J. Mecholsky
Keyword(s):  
Fracture Toughness ◽  
Liquid Crystalline ◽  
Liquid Crystalline Epoxy
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