Synthesis and Thermal Properties of Liquid Crystalline Thermoset containing                 Rigid-Rod Epoxy

Cho, Seung-Hyun; Lee, Jun Young; Douglas, Elliot P.

doi:10.1177/0954008306056484

Cited by 15 publications

(6 citation statements)

References 38 publications

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“…Generally, liquid crystalline epoxides containing large rigid-rod repeating units owned noticeable high-temperature properties. It was reported that the most important factor affecting the thermal stability is the molecular [33][34][35][36], network structure [35] and mesogen concentration [37,38]. It could be found from the report of Cho et al [33] that the cured liquid crystalline epoxy (D2A1) has higher thermal stability than uncured D2A1, which indicated higher thermal stability was attributed to a dense mesogen network.…”

Section: The Thermal Degradation Of Substituted Biphenyl Epoxiesmentioning

confidence: 94%

High thermal conductivity epoxies containing substituted biphenyl mesogenic

Guo

Zheng

Gan

et al. 2015

J Mater Sci: Mater Electron

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In this work, a series of high thermal conductivity epoxies containing substituted biphenyl mesogenic were prepared and characterized. The liquid crystalline phase structure of substituted biphenyl epoxies was determined by polarized optical microscopy. Differential scanning calorimetry and thermogravimetric were used to characterize the thermal properties of substituted biphenyl epoxies. The relationship between thermal conductivity and liquid crystalline domain structure was discussed in our paper. The samples show high thermal conductivity up to 0.28 W/(m*K), owing to the introduction of biphenyl mesogenic into epoxes, which indicates that the thermal conductivity was apparently better than that of conventional epoxy systems. The high glass transition temperatures ranging from 128 to 178°C and high thermal resistance can make contribute to a stable fixed shape. The high thermal conductivity and high thermal properties can make this epoxy very suitable for the application in microelectronics.

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Section: The Thermal Degradation Of Substituted Biphenyl Epoxiesmentioning

confidence: 94%

High thermal conductivity epoxies containing substituted biphenyl mesogenic

Guo

Zheng

Gan

et al. 2015

J Mater Sci: Mater Electron

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“…Subsequent research in this area has resulted in a group of materials known as liquid crystalline thermosets (LCTs), whose properties transcend those observed with typical thermosetting resins bereft of any molecular order [11][12][13] . LCTs have been prepared with a variety of monomers including epoxy [14][15][16][17][18][19][20][21][22] , acrylate [23][24] , cyanate ester [25][26][27] , and maleimide [28][29] . LCERs are the most extensively investigated among LCTs due to their excellent thermomechanical properties, especially their good mechanical strength, low dielectric constant, low shrinkage upon curing, and ease of processing [30][31][32][33][34][35][36] .…”

Section: Liquid Crystalline Epoxy Resinsmentioning

confidence: 99%

Nano-Zirconium Tungstate Reinforced Liquid Crystalline Thermosetting Composites with Near Zero Thermal Expansion

Kessler¹,

Li²,

Constant³

2015

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Air Force Materiel Command REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Service Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR ABSTRACTOne crucial factor limiting the performance of polymer matrix composites is their relatively high coefficient of thermal expansion (CTE), which impacts the dimensional stability of these materials. This report described the synthesis and characterization of zirconium tungstate (ZrW2O8) nanoparticles with negative CTE and their applications in an epoxy resin to produce low CTE nanocomposites. This work also described the synthesis and characterization of a unique class of thermosets known as liquid crystalline epoxy resins (LCERs) for the development of advanced polymer matrices for high performance composites. Results showed that it was possible to control structure and the resulting functionality of the LCERs by curing the synthesized epoxy monomer with appropriate curing agents. Highly crosslinked LCERs exhibited a self-reinforcing effect because of the self-organized liquid crystalline phase and are promising candidates for the polymer matrices in structural composites. Lightly crosslinked LCERs exhibited a triple shape memory effect and are excellent candidates for the development of multifunctional polymer composites. 5a. CONTRACT NUMBER. Enter all contract numbers as they appear in the report, e.g. F33615-86-C-5169. SUBJECT TERMS5b. GRANT NUMBER. Enter all grant numbers as they appear in the report, e.g. AFOSR-82-1234. 5c. PROGRAM ELEMENT NUMBER.Enter all program element numbers as they appear in the report, e.g. 61101A.5d. PROJECT NUMBER. Enter all project numbers as they appear in the report, e.g. 1F665702D1257; ILIR.5e. TASK NUMBER. Enter all task numbers as they appear in the report, e.g. 05; RF0330201; T4112.5f. WORK UNIT NUMBER. Enter all work unit numbers as they appear in the report, e.g. 001; AFAPL30480105. AUTHOR(S). Enter name(s) of person(s)responsible for writing the report, performing the research, or credited with the content of the report. The form of entry is the last name, first name, middle initial, and additional qualifiers separated by commas, e.g. Smith, Richard, J, Jr. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES).Self-explanatory. PERFORMING ORGANIZATION REPORT NUMBER.Enter all unique alphanumeric report numbers assigned by the perf...

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“…14,15 이러한 LCT는 † To whom correspondence should be accressed. E-mail: changjinhae@hanmail.net 문현곤ㆍ정명섭ㆍ장진해 폴리머 , 제 36 권 제 1 호 , 2012 년 메타크릴산염, 16,17 아세틸렌, 18,19 에폭시, 20,21 말레이미드, [22][23][24] 나드이미드, 23,24 Figure 3에 보였다. 이미 가교된 LCT 필름 (Figure 3(b)) 보다는 LC 시료 (Figure 3(a) (Table 3).…”

Section: 서 론unclassified

Synthesis and Characterization of Wholly Aromatic Polyester Liquid Crystalline Thermosets

Moon¹,

Jung²,

Chang³

2012

Polymer Korea

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We prepared a series of aromatic liquid crystals (LCs) based on wholly aromatic ester units with the reactive end group methyl maleimide by means of melt condensation method, and the resulting LCs were thermally crosslinked to produce liquid crystalline thermoset (LCT) films. The synthesized LCs and LCTs were characterized with Fourier transform infrared (FTIR) spectroscopy, wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermomechanical analysis (TMA), and polarizing optical microscopy (POM) with a hot stage. The glass transition temperature (T g ) and coefficient of thermal expansion are strongly affected by the mesogen units in their main chain structures. The p-substituted biphenyl LC was found to have the highest thermal property value.

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Synthesis and Thermal Properties of Liquid Crystalline Thermoset containing Rigid-Rod Epoxy

Cited by 15 publications

References 38 publications

High thermal conductivity epoxies containing substituted biphenyl mesogenic

High thermal conductivity epoxies containing substituted biphenyl mesogenic

Nano-Zirconium Tungstate Reinforced Liquid Crystalline Thermosetting Composites with Near Zero Thermal Expansion

Synthesis and Characterization of Wholly Aromatic Polyester Liquid Crystalline Thermosets

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