Liquid crystalline epoxy resin based on biphenyl mesogen: Thermal characterization

Li, Yuzhan; Badrinarayanan, Prashanth; Kessler, Michael R.

doi:10.1016/j.polymer.2013.03.043

Cited by 77 publications

(71 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Firstly, the filler effect mentioned earlier, namely filler can act as physical interlock points, which confine polymer chains and reduce the chains mobility [40]. Secondly, the LC domains also act as crosslink, tying segments of the polymer chain together [19]. They do not relax or become soft at higher temperature, and therefore the movements of the polymer chains are restricted by these rigid LC domains.…”

Section: Resultsmentioning

confidence: 99%

“…Accordingly, we can easily to prepare a variety of excellent functional composites. Liquid crystalline epoxies (LCE) form a unique class of thermosetting materials, which combine the properties of both liquid crystal and conventional thermosets, as shown by their anisotropic mechanical properties, excellent thermal stability and chemical resistance [16][17][18].Curing of low molecular weight, rigid rod, and multifunctional monomers result in the retention of a liquid crystalline phase by the three dimensional crosslinking networks [19,20]. Hence, it can be used to improve toughness of composites.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Qi¹,

Lu²,

Xiao³

et al. 2014

Express Polym. Lett.

111

View full text Add to dashboard Cite

Abstract. Graphene oxide (GO) sheets were chemically grafted with thermotropic liquid crystalline epoxy (TLCP). Then we fabricated composites using TLCP-g-GO as reinforcing filler. The mechanical properties and thermal properties of composites were systematically investigated. It is found that the thermal and mechanical properties of the composites are enhanced effectively by the addition of fillers. For instance, the composites containing 1.0 wt% of TLCP-g-GO present impact strength of 51.43 kJ/m 2 , the tensile strength of composites increase from 55.43 to 80.85 MPa, the flexural modulus of the composites increase by more than 48%. Furthermore, the incorporation of fillers is effective to improve the glass transition temperature and thermal stability of the composites. Therefore, the presence of the TLCP-g-GO in the epoxy matrix could make epoxy not only stronger but also tougher.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Qi¹,

Lu²,

Xiao³

et al. 2014

Express Polym. Lett.

111

View full text Add to dashboard Cite

show abstract

“…The NTE behavior of ZrW2O8 is caused by the transverse vibration of oxygen atoms linking WO4 tetrahedra and ZrO6 octahedra in the unit cell, leading to polyhedra rotation with rising temperature, shown in ZrW2O8 has attracted a growing research interest for its potential application as a fillers material in composites to control thermal expansion and eliminate residual stress generated under the temperature cycling. Several studies indicated that ZrW2O8 could be incorporated into metal and ceramic-based matrices, however, due to the overall high CTE values of polymer materials, ZrW2O8 has been widely applied in epoxy resins [1][2][3] , polyimides [4][5] , phenolic resins 6 , and cyanate esters [7][8][9] . In the recent decades, the development of nano-scale ZrW2O8 opens a new research field.…”

Section: Zirconium Tungstate Nanoparticlesmentioning

confidence: 99%

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

Kessler¹,

Li²,

Constant³

2015

Self Cite

View full text Add to dashboard Cite

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...

show abstract

“…The corrosive resistance of Q235 was improved by using anti-corrosion coating commonly [2]. The ethoxyline resin is considered to be a promising material due to their excellent mechanical properties and chemical resistance, easy crosslinking and curing to make film strong compactness, high adhesion [3][4][5][6][7]. The research of H. Abd El-Wahab et al [8] showed that a certain amount of polyamide can short the curing time of epoxy asphalt coating and the water resistance of coatings was also improved.…”

Section: Introductionmentioning

confidence: 99%

Corrosive Behavior Study of Q235 Steel Coated with Epoxy Composites in Substation Environment

Li¹,

Jin²,

Chen³

et al. 2017

Proceedings of the 2016 International Forum on Mechanical, Control and Automation (IFMCA 2016)

View full text Add to dashboard Cite

Abstract. In this work, the epoxy composite coating composited by zinc rich epoxy primer and silver epoxy enamel, was sprayed on the surface of Q235 steel. The anticorrosion of as-prepared samples in substation environment with atmospheric exposure for 18 months, and in 5% NaCl aqueous solution for 250 days were evaluated and compared, respectively. Electrochemical impedance spectroscopy (EIS) was employed to analyze the corrosive behavior of epoxy composite coating in 5% NaCl aqueous solution, the weather resistance and salt resistance were also evaluated. Additionally, the structure changes of epoxy composite coating induced by salt immersion and atmospheric exposure were characterized by fourier transform infrared (FT-IR). The results are demonstrated that the epoxy composite coating is corroded to be invalid after immersed into 5% NaCl aqueous solution for 250 days, which the impedance decreases from 3.967×10 9 ·cm 2 to 9.780×10 2 ·cm 2 . The mechanism of corrosion is proposed that the corrosive medium gradually penetrate into the composite coating to form micro electric circuit through micro pores, resulting in the increase of porosity and corrosive rate for the composite coating. However, the impedance of epoxy composite coating in substation environment for 18 months is still 2.708×10 6 ·cm 2 , indicating the good corrosion resistance.

show abstract

Liquid crystalline epoxy resin based on biphenyl mesogen: Thermal characterization

Cited by 77 publications

References 38 publications

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

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

Corrosive Behavior Study of Q235 Steel Coated with Epoxy Composites in Substation Environment

Contact Info

Product

Resources

About