New synthesis and characterization of ionic polyurethane-urea liquid crystals

Jaisankar, Sellamuthu N.; Nelson, Donna J.; Brammer, Christopher N.

doi:10.1016/j.polymer.2009.07.049

Cited by 20 publications

(8 citation statements)

References 66 publications

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“…Unlike other additive such as rubber particles, the presence of liquid crystalline domains will not sacrifice T g or modulus of the material. These outstanding properties make LCE as good candidates for a wide range of potential applications, such as optical switches, electronic packaging, and matrices for high performance composites [21][22][23].…”

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

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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.

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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

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“…At higher magnification, the TEM image shows acrylic ionomers attached to the SWCNT sidewalls and that each nanotube is sheathed by regions of ionomer, presumably corresponding to the poly (acrylate) 4 Zr. In Figures a–c, (see arrows), large nanotube bundles of 2 are separated into individual tubes due to ionomer functionalization, possibly as a result of steric repulsion between ionomeric groups . Formation of a large network of nanotubes that are interconnected by Zr cations, chelated by carboxylate groups which ionically crosslink the ionomer chains is also possible …”

Section: Resultsmentioning

confidence: 99%

“…CP/MAS solid‐state 13 C NMR has also been used to characterize the covalently modified SWCNTs, and ionomer‐functionalized SWCNTs 2 and polymer 3 were also characterized by same technique. ZA ionomer is a linear polymer that contains polar carboxylate groups attached to the hydrophobic CH polymer backbone.…”

Section: Resultsmentioning

confidence: 99%

Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

Jaisankar¹,

Nelson²,

Kumar³

et al. 2014

AIChE Journal

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A facile and efficient covalent functionalization of single-walled carbon nanotubes (SWCNTs) via peroxide-mediated free radical covalent attachment and polymerization of zirconium acrylate is reported. The resulting covalently functionalized SWCNTs exhibit improved solubility in organic solvents. The covalently functionalized SWCNTs are characterized by cross polarization magic angle spinning 13 C NMR, differential scanning calorimetry, thermogravimetric analysis, x-ray diffraction, Raman, and infrared spectroscopy. Infrared spectroscopy reveals that carboxylate groups of covalently attached ionomers chelate with zirconium ions and the participating carboxylate groups may be from different ionomer chains leading to cross-linking the chains. The SWCNT topology, ionic clustering, and p-electron clouds were explored by transmission electron microscopy. V C 2014 American Institute of Chemical Engineers AIChE J, 60: [820][821][822][823][824][825][826][827][828] 2014

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“…[1,2] As a result, tremendous research efforts have been reported to improve the thermal stability of PUs. Most of the reported approaches are based on copolymerization or blending with other polymers of high thermal stability such as polyimides, [3][4][5][6] polyurea, [7,8] polyamide, [9,10] and polyazomethine. [11] Polyimides are high-performance polymers because of their high thermal and thermo-oxidative stabilities, high transition temperatures, and chemical resistance, insulating, and excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal, fluorescence, and electrochemical characteristics of novel poly(urethane-imide)s

Avcı

Şirin

2013

Designed Monomers and Polymers

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In this study, the novel thermally stable poly(urethane-imide)s (PUIs) were synthesized. The structures of the obtained polymers were confirmed by FT-IR and NMR techniques. The molecular weight distribution parameters of the synthesized PUIs were determined by the size exclusion chromatography (SEC). The synthesized PUIs were also characterized by solubility tests, solution viscosity, TG-DTA, and DSC analyses. Cyclic voltammetry measurements were carried out, and HOMO-LUMO energy levels and electrochemical band gaps (E 0 g ) were calculated from their absorption edges. Additionally, optical band gaps (E g ) were determined by using UV-vis spectra of the materials. Fluorescence measurements were carried out in various concentrated DMSO solutions to determine the optimum concentrations to obtain the maximal PL intensities. Also, morphological characterizations were made by scanning electron microscopy technique.

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New synthesis and characterization of ionic polyurethane-urea liquid crystals

Cited by 20 publications

References 66 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

Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

Thermal, fluorescence, and electrochemical characteristics of novel poly(urethane-imide)s

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