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

Youngsu Kim; Hyeonuk Yeo; Nam Ho You; Se Gyu Jang; Seokhoon Ahn; Kwang Un Jeong; Seung Hee Lee; Munju Goh

doi:10.1039/c7py00243b

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

Youngsu Kim, Hyeonuk Yeo, Nam Ho You, Se Gyu Jang, Seokhoon Ahn, Kwang Un Jeong, Seung Hee Lee, Munju Goh

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Abstract

To develop advanced thermally conductive epoxy resins with liquid crystallinity, three novel liquid crystalline epoxies (LCEs) were synthesized via the substitution of phenylcyclohexyl (PCH) mesogenic moieties into the 2,5 positions of diglycidyl terephthalate. Mesomorphic properties of LCEs were evaluated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD). All LCEs exhibited an enantiotropic smectic phase on heating and cooling. Remarkably, the smectic phase with a wide temperature range of 98-145 °C was observed for the eutectic mixtures of a family of stable smectic LCEs. The selection of optimum curing agents, compositions of LCEs and curing agents, and curing conditions were determined based on physical, chemical, and thermal properties of LCEs and curing agents. The thermally cured LCEs at the LC phase exhibited a high thermal conductivity of 0.4 W m^-1 K^-1.

Original language	English
Pages (from-to)	2806-2814
Number of pages	9
Journal	Polymer Chemistry
Volume	8
Issue number	18
DOIs	https://doi.org/10.1039/c7py00243b
State	Published - 14 May 2017

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

abstract = "To develop advanced thermally conductive epoxy resins with liquid crystallinity, three novel liquid crystalline epoxies (LCEs) were synthesized via the substitution of phenylcyclohexyl (PCH) mesogenic moieties into the 2,5 positions of diglycidyl terephthalate. Mesomorphic properties of LCEs were evaluated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD). All LCEs exhibited an enantiotropic smectic phase on heating and cooling. Remarkably, the smectic phase with a wide temperature range of 98-145 °C was observed for the eutectic mixtures of a family of stable smectic LCEs. The selection of optimum curing agents, compositions of LCEs and curing agents, and curing conditions were determined based on physical, chemical, and thermal properties of LCEs and curing agents. The thermally cured LCEs at the LC phase exhibited a high thermal conductivity of 0.4 W m-1 K-1.",

author = "Youngsu Kim and Hyeonuk Yeo and You, {Nam Ho} and Jang, {Se Gyu} and Seokhoon Ahn and Jeong, {Kwang Un} and Lee, {Seung Hee} and Munju Goh",

note = "Publisher Copyright: {\textcopyright} 2017 The Royal Society of Chemistry.",

year = "2017",

month = may,

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doi = "10.1039/c7py00243b",

language = "English",

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T1 - Highly thermal conductive resins formed from wide-temperature-range eutectic mixtures of liquid crystalline epoxies bearing diglycidyl moieties at the side positions

AU - Kim, Youngsu

AU - Yeo, Hyeonuk

AU - You, Nam Ho

AU - Jang, Se Gyu

AU - Ahn, Seokhoon

AU - Jeong, Kwang Un

AU - Lee, Seung Hee

AU - Goh, Munju

PY - 2017/5/14

Y1 - 2017/5/14

N2 - To develop advanced thermally conductive epoxy resins with liquid crystallinity, three novel liquid crystalline epoxies (LCEs) were synthesized via the substitution of phenylcyclohexyl (PCH) mesogenic moieties into the 2,5 positions of diglycidyl terephthalate. Mesomorphic properties of LCEs were evaluated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD). All LCEs exhibited an enantiotropic smectic phase on heating and cooling. Remarkably, the smectic phase with a wide temperature range of 98-145 °C was observed for the eutectic mixtures of a family of stable smectic LCEs. The selection of optimum curing agents, compositions of LCEs and curing agents, and curing conditions were determined based on physical, chemical, and thermal properties of LCEs and curing agents. The thermally cured LCEs at the LC phase exhibited a high thermal conductivity of 0.4 W m-1 K-1.

AB - To develop advanced thermally conductive epoxy resins with liquid crystallinity, three novel liquid crystalline epoxies (LCEs) were synthesized via the substitution of phenylcyclohexyl (PCH) mesogenic moieties into the 2,5 positions of diglycidyl terephthalate. Mesomorphic properties of LCEs were evaluated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD). All LCEs exhibited an enantiotropic smectic phase on heating and cooling. Remarkably, the smectic phase with a wide temperature range of 98-145 °C was observed for the eutectic mixtures of a family of stable smectic LCEs. The selection of optimum curing agents, compositions of LCEs and curing agents, and curing conditions were determined based on physical, chemical, and thermal properties of LCEs and curing agents. The thermally cured LCEs at the LC phase exhibited a high thermal conductivity of 0.4 W m-1 K-1.

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U2 - 10.1039/c7py00243b

DO - 10.1039/c7py00243b

M3 - Article

AN - SCOPUS:85021786979

SN - 1759-9954

VL - 8

SP - 2806

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JO - Polymer Chemistry

JF - Polymer Chemistry

IS - 18

ER -

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

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