Liquid Crystalline Thermoset Epoxy Resins

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.216.34 ◽

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.

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New liquid-crystalline thermosets from liquid-crystalline bisazomethynic epoxy resins with naphthylene disruptors in the central core

Journal of Polymer Science Part A Polymer Chemistry ◽

10.1002/pola.10700 ◽

2003 ◽

Vol 41 (10) ◽

pp. 1536-1544 ◽

Cited By ~ 23

Author(s):

P. Castell ◽

A. Serra ◽

M. Galià

Keyword(s):

Epoxy Resins ◽

Liquid Crystalline ◽

Central Core

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Synthesis and characterization of liquid crystalline epoxy resins

10.31274/etd-180810-1710 ◽

2014 ◽

Author(s):

Yuzhan Li

Keyword(s):

Epoxy Resins ◽

Liquid Crystalline ◽

Synthesis And Characterization ◽

Liquid Crystalline Epoxy

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Research Progress of New Methods for Toughening Epoxy Resin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.490-495.3598 ◽

2012 ◽

Vol 490-495 ◽

pp. 3598-3602 ◽

Cited By ~ 3

Author(s):

Li Ying Guo ◽

Li Yan Wang ◽

Xin Su

Keyword(s):

Epoxy Resin ◽

Epoxy Resins ◽

Liquid Crystalline ◽

Research Progress ◽

Nano Particle ◽

Technology Research ◽

Future Prospects ◽

Thermoplastic Resin ◽

Rigid Polymer ◽

New Methods

The epoxy is a thermosetting resin, for the lack of toughness after cured ,a brief introduction of epoxy resin toughening technology research progress, detailed in the recent years a number of toughening epoxy resins new methods, including toughened thermoplastic resin, IPN toughening, core-shell particle toughening, thermotropic liquid crystalline toughness, rigid polymer toughening, nano-particle toughening and so on. At last, the paper provided an overview of the progress of epoxy toughening modification technology and its future prospects.

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Permeability of A Liquid Crystalline Epoxy

MRS Proceedings ◽

10.1557/proc-709-cc9.1.1 ◽

2001 ◽

Vol 709 ◽

Cited By ~ 1

Author(s):

Jianxun Feng ◽

Elliot P. Douglas

Keyword(s):

Liquid Crystalline ◽

Barrier Properties ◽

Two Phase ◽

Solubility Coefficient ◽

Epoxy Network ◽

Liquid Crystalline Epoxy ◽

Smectic Mesophase ◽

Liquid Crystalline Thermoset ◽

Epoxy Systems ◽

Main Factor

ABSTRACTThis paper presents a comparison of moisture permeation in liquid crystalline and conventional epoxy systems. The permeability is obtained using a dynamic method. It is found that both epoxy systems exhibit Fickian behavior. The liquid crystalline epoxy network exhibits higher barrier properties for moisture transport than the conventional epoxy network. The efficient chain packing within the smectic mesophase of the liquid crystalline thermoset (LCT) is suggested as the main factor for this difference. The stoichiometry has a large effect on the moisture permeation. The diffusion coefficient decreases monotonically with increasing amine/epoxide functional ratio. The permeability (P) and solubility coefficient (S) reach a minimum at a functional ratio of one. The mechanism of the permeation is described in terms of the two-phase morphology present and hydrogen bonding between absorbed water and the network.

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