Carbon Nanotube-Reinforced Thermotropic Liquid Crystal Polymer Nanocomposites

Kim, Jun Young

doi:10.3390/ma2041955

Cited by 52 publications

(32 citation statements)

References 87 publications

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“…It was observed that η * decreased with increasing ω for neat TPER and UFC-filled composites, indicating a non-Newtonian behavior and pseudoplastic characteristics over the entire ω range studied (Wang et al 2008;Kim 2009;Barick and Tripathy 2011). This behavior can be explained as being due to the random orientation of the rigid molecular chains upon the application of shear force (Kim 2009). The UFC-filled composites exhibited higher η * than the neat TPER, especially at low frequencies.…”

Section: Resultsmentioning

confidence: 95%

“…The slopes of G' and G" decreased minimally with increasing UFC content in the TPER matrix ( Fig. 3a and b), and the decrease can be explained by the fact that UFC-UFC or UFC-TPER interactions can induce interconnected or network-like structures, leading to the pseudosolid-like behavior (Wang et al 2008;Kim 2009). Pseudo solid-like behavior was also reported for other cellulose-filled polymer systems (Shumigin et al 2011;Kiziltas et al 2014b;Kiziltas et al 2016a;Kiziltas et al 2016b).…”

Section: Resultsmentioning

confidence: 98%

“…A similar observation was also reported by Chmielewski and Kaffenberger (2008) for TPER/MWCNT, TPER/wood flour, TPER/micro scale cellulose, TPER/HDPE blend/wood flour, TPER/HDPE blend/micro-scale cellulose, and TPER/short glass fiber composites. The interfacial interactions between UFC and TPER, and the uniform dispersion of UFC in the TPER matrix, could be the reasons for improved tensile and flexural properties in UFC-filled TPER composites (Kim 2009). To gain a better understanding of interactions and interface between TPER and UFC, and improvement on tensile and flexural properties in UFC-filled composites, techniques such as microscopic observation using scanning electron microscopy, FT-IR nano-indentation, dynamic mechanical thermal analysis, and microbond testing methods could be employed.…”

Section: Resultsmentioning

confidence: 99%

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Rheological and Mechanical Properties of Ultra-fine Cellulose-Filled Thermoplastic Epoxy Composites

2016

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a Thermoplastic epoxy resin (TPER)-based composites containing different amounts of ultra-fine cellulose (UFC) were prepared via melt compounding and injection molding. The effect of UFC loading on the mechanical properties and dynamic rheological behavior of the UFC-filled TPER composites was analyzed. The UFC-filled composites displayed higher complex viscosities than those of the neat TPER composites, especially at low frequencies. The elastic modulus of the 20 wt.% UFC-filled composite was up to 6-and 2-fold higher than that of TPER at 0.1 and 100 Hz, respectively. The loss factor decreased over the entire frequency range with the incorporation of UFC. The tensile modulus of elasticity (TMOE) of neat TPER was 3.13 GPa, and it increased as a function of UFC loading. The neat TPER exhibited the lowest flexural strength (108.1 MPa), and the flexural strength increased by 14% with the incorporation of 20 wt.% UFC. The results of the TMOE and the flexural modulus of elasticity (FMOE) were in agreement with rheological data on complex viscosity, elastic modulus, and viscous modulus. Ultra-fine cellulose-filled TPER composites may provide special capabilities for automotive applications and may also meet requirements for end-of-life vehicle (ELV) directives.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Rheological and Mechanical Properties of Ultra-fine Cellulose-Filled Thermoplastic Epoxy Composites

2016

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“…Because the crystalline order between LCP polymer chains is maintained even at elevated temperatures, it is of great interest to determine how GO layers will disperse in LCP, and how the mechanical properties and electrical conductivity of the resulting materials will be modified. To the best of our knowledge, only limited studies are available on the effect of carbonaceous nanofillers on the physical and mechanical properties of LCPs [39][40][41][42]. Noteworthy, multifunctional materials such as LCP nanocomposites offer a great potential to enhance not only the mechanical and thermal properties with respect to the unmodified polymer, but also functional properties including high electrical and thermal conductivity, providing the opportunity to be used in different fields such as automotive, electronic packaging, aerospace, energy storage, etc.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystalline polymer nanocomposites reinforced with in-situ reduced graphene oxide

Pedrazzoli¹,

Dorigato²,

Conti³

et al. 2015

Express Polym. Lett.

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Abstract. In this work liquid-crystalline polymer (LCP) nanocomposites reinforced with in-situ reduced graphene oxide are investigated. Graphene oxide (GO) was first synthesized by the Hummers method, and the kinetics of its thermal reduction was assessed. GO layers were then homogeneously dispersed in a thermotropic liquid crystalline polymer matrix (Vectran ® ), and an in-situ thermal reduction of GO into reduced graphene oxide (rGO) was performed. Even at low rGO amount, the resulting nanocomposites exhibited an enhancement of both the mechanical properties and the thermal stability. Improvements of the creep stability and of the thermo-mechanical behavior were also observed upon nanofiller incorporation. Furthermore, in-situ thermal reduction of the insulating GO into the more electrically conductive rGO led to an important surface resistivity decrease in the nanofilled samples.

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“…Kim et al [80] used the Halpin-Tsai model to compare their experimental result to the theoretical ones. The L MWCNT /D MWCNT (aspect ratio) was taken as 1,000.…”

Section: Mechanical Properties Of Mwcnt/tlcp Nanocompositesmentioning

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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Carbon Nanotube-Reinforced Thermotropic Liquid Crystal Polymer Nanocomposites

Cited by 52 publications

References 87 publications

Rheological and Mechanical Properties of Ultra-fine Cellulose-Filled Thermoplastic Epoxy Composites

Rheological and Mechanical Properties of Ultra-fine Cellulose-Filled Thermoplastic Epoxy Composites

Liquid crystalline polymer nanocomposites reinforced with in-situ reduced graphene oxide

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

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