Toughening Mechanism of Liquid Crystalline Epoxy Resin with Spacers Outside the Mesogenic Group

The toughness mechanism of the liquid crystalline epoxy resin DGE(C2-MS-C2))-which has an α-methylstilbene moiety as a mesogenic group and ethylene oxy units as spacers-cured with diaminodiphenylethane (DDEt) was investigated using time-resolved wide-angle X-ray diffraction (WAXD) measurements perfo...

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Bibliographic Details
Published inMolecular Crystals and Liquid Crystals Vol. 609; no. 1; pp. 80 - 92
Main Authors Yamamoto, Hisanao, Sakamoto, Naoki, Fujita, Akira, Harada, Miyuki, Ochi, Mitsukazu
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 04.03.2015
Taylor & Francis Ltd
Subjects
Crystallography
Crystals
Diffraction
Elongation
Epoxy resins
Ethylene
Fracture toughness
LC thermosets
liquid crystalline epoxy resin
Liquid crystals
Molecular physics
Molecular structure
Networks
reorientation
Spacers
Tensile strength
time-resolved WAXD
XRD
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Summary:The toughness mechanism of the liquid crystalline epoxy resin DGE(C2-MS-C2))-which has an α-methylstilbene moiety as a mesogenic group and ethylene oxy units as spacers-cured with diaminodiphenylethane (DDEt) was investigated using time-resolved wide-angle X-ray diffraction (WAXD) measurements performed during tensile tests. The WAXD patterns of the isotropic (ISO) and LC networks of DGE(C2-MS-C2)/DDEt indicated the molecular chains in the networks were oriented along the elongation direction, with the LC network being more highly orientated than the ISO network. The dissipation energy generated during the reorientation of the network chains was proposed as the origin of the high fracture toughness of DGE(C2-MS-C2)/DDEt.
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ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2014.961591