Fracture toughness and fracture mechanism of liquid-crystalline epoxy resins with different polydomain structures

2010 ◽  
Vol 48 (22) ◽  
pp. 2337-2345 ◽  
Author(s):  
Miyuki Harada ◽  
Naoki Okamoto ◽  
Mitsukazu Ochi
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanism ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Liquid Crystalline Epoxy

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

Synthesis of Three Novel Aromatic Biazomethine Liquid- Crystalline Epoxy Resins and Curing Reaction with Aromatic Diamine

2011 ◽  
Vol 216 ◽  
pp. 34-38
Author(s):  
Jun Gang Gao ◽  
Xiao Na Zhang ◽  
Yong Gang Du
Keyword(s):  
Melting Point ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
Diphenyl Ether ◽  
Hydroxyl Group ◽  
Aromatic Diamine ◽  
Curing Reaction ◽  
Ozawa Equation ◽  
Liquid Crystalline Epoxy ◽  
Clearing Temperature

Three class of novel liquid crystalline epoxy resins containing azomething groups: N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEPBDDE), N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl methane (p-BEPBDDM) and N,N’-Bis[(4-(2,3-epoxypropoxy)-benzyliden)-1,4- phenylene diamine] (p-BEPBPD) were synthesized and characterized. The results show that p-BEBDDE and p-BEBDDM belong to smectic texture and melting point is 239.5 and 178 oC, respectively. The p-BEPBD is nematic texture between its melting temperature (Tm) of 192 oC and clearing temperature (Ti) of 238 oC. The curing reaction can be described by Ozawa equation, and the alcohol-hydroxyl group can accelerate the curing reaction and decrease Ea in DSC experiment.

Highly thermal conductive resins formed from wide-temperature-range eutectic mixtures of liquid crystalline epoxies bearing diglycidyl moieties at the side positions

2017 ◽  
Vol 8 (18) ◽  
pp. 2806-2814 ◽  
Author(s):  
Youngsu Kim ◽  
Hyeonuk Yeo ◽  
Nam-Ho You ◽  
Se Gyu Jang ◽  
Seokhoon Ahn ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Wide Temperature Range ◽  
Epoxy Resins ◽  
Liquid Crystalline ◽  
High Thermal Conductivity ◽  
Temperature Range ◽  
Eutectic Mixtures ◽  
Liquid Crystalline Epoxy ◽  
Conductive Resins

Liquid crystalline epoxy resins with a wide temperature range exhibit a high thermal conductivity of 0.4 W m−1 K−1.

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