Effect of modified carbon nanotube on physical properties of thermotropic liquid crystal polyester nanocomposites

Kim, Jun Young; Kim, Duk Ki; Kim, Seong Hun

doi:10.1016/j.eurpolymj.2008.10.043

Cited by 67 publications

(22 citation statements)

References 48 publications

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“…The higher the values of G' and G'', the greater the number of interactions and/or the stronger the interactions within the gel. [22] These results point to the fact that, besides the prevailing cation-p interactions as already highlighted elsewhere, [11] Van der Waals interactions between the ILs and the SWNT surface, due to the presence of the alkyl chains on the imidazolyl group, do affect the viscosity of the bucky gels and the ability of the investigated ILs to exfoliate SWNTs. The better performance of [hvim]A C H T U N G T R E N N U N G [(CF 3 SO 2 ) 2 N] at SWNT debundling is probably due to its higher polarizability (thanks to both its long alkyl chain and extra double bond), which renders it capable of interacting favorably with the CNT surface through stronger dispersion forces, which help to overcome the inter-SWNT attraction.…”

mentioning

confidence: 76%

Microwave‐Assisted Functionalization of Carbon Nanostructures in Ionic Liquids

Guryanov

Toma

López

et al. 2009

Chemistry A European J

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The effect of microwave (MW) irradiation and ionic liquids (IL) on the cycloaddition of azomethine ylides to [60]fullerene has been investigated by screening the reaction protocol with regard to the IL medium composition, the applied MW power, and the simultaneous cooling of the system. [60]Fullerene conversion up to 98 % is achieved in 2-10 min, by using a 1:3 mixture of the IL 1-methyl-3-n-octyl imidazolium tetrafluoroborate ([omim]BF(4)) and o-dichlorobenzene, and an applied power as low as 12 W. The mono- versus poly-addition selectivity to [60]fullerene can be tuned as a function of fullerene concentration. The reaction scope includes aliphatic, aromatic, and fluorous-tagged (FT) derivatives. MW irradiation of IL-structured bucky gels is instrumental for the functionalization of single-walled carbon nanotubes (SWNTs), yielding group coverages of up to one functional group per 60 carbon atoms of the SWNT network. An improved performance is obtained in low viscosity bucky gels, in the order [bmim]BF(4)> [omim]BF(4)> [hvim]TF(2)N (bmim=1-methyl-3-n-butyl imidazolium; hvim=1-vinyl-3-n-hexadecyl imidazolium). With this protocol, the introduction of fluorous-tagged pyrrolidine moieties onto the SWNT surface (1/108 functional coverage) yields novel FT-CNS (carbon nanostructures) with high affinity for fluorinated phases.

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mentioning

confidence: 76%

Microwave‐Assisted Functionalization of Carbon Nanostructures in Ionic Liquids

Guryanov

Toma

López

et al. 2009

Chemistry A European J

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“…Incorporation of these very small amounts of carboxylated MWCNTs improved the mechanical properties of MWCNT/LCP nanocomposites, and this was attributed to the reinforcement effect of carboxylated MWCNTs with a high aspect ratio and their uniform dispersion in the LCP matrix. Kim et al [15] fabricated the nanocomposites based on TLCP, synthesized from poly(p-hydroxybenzoate) and poly(ethylene terephthalate) with a molar ratio of 80:20 and a very small quantity of MWCNTs by direct melt compounding in a twin-screw extruder. The tensile strength and modulus of a composite containing 1.5 wt.% of MWCNT-COOH were enhanced by 41.4% and 34.1%, respectively as compared to its respective pure LCP.…”

Section: Mechanical Properties Of Mwcnt/tlcp Nanocompositesmentioning

confidence: 99%

“…The second reason was related to the discovery of CNTs by Iijima in early 1991 [12]. The unpredictably sophisticated properties of these CNTs, especially their superior mechanical and electrical properties over those of the traditional fillers, offer an exciting potential for new composite materials [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Current Advances in the Carbon Nanotube/Thermotropic Main-Chain Liquid Crystalline Polymer Nanocomposites and Their Blends

et al. 2012

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Because of their extraordinary properties, such as high thermal stability, flame retardant, high chemical resistance and high mechanical strength, thermotropic liquid crystalline polymers (TLCPs) have recently gained more attention while being useful for many applications which require chemical inertness and high strength. Due to the recent advance in nanotechnology, TLCPs are usually compounded with nanoparticles to form particulate composites to enhance their properties, such as barrier properties, electrical properties, mechanical properties and thermal properties. Carbon-based nanofillers such as carbon nanotube (CNT), graphene and graphene oxide are the most common fillers used for the TLCP matrices. In this review, we focus on recent advances in thermotropic main-chain liquid crystalline polymer nanocomposites incorporated with CNTs. However, the biggest challenges in the preparation of CNT/TLCP nanocomposites have been shown to be inherent in the dispersion of CNTs into the TLCP matrix, the alignment and control of CNTs in the TLCP matrix and the load-transfer between the TLCP matrix and CNTs. As a result, this paper reviews recent advances in CNT/TLCP nanocomposites through enhanced dispersion of CNTs in TLCPs as well as their improved interfacial adhesion with the TLCP matrices. Case studies on the important role of chemically modified CNTs in the TLCP/thermoplastic polymer blends are also included. OPEN ACCESSPolymers 2012, 4 890

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“…As a result, CNT has been used in various applications either on its own or as reinforcement in composite material. Various synthesis methods have been developed for the production of CNT in the past [6][7][8][9][10][11][12][13]. Methane decomposition is one type of chemical vapour deposition (CVD) process which is an efficient method to produce CNT.…”

Section: Introductionmentioning

confidence: 99%