Polycarbonate Crystallization by Vapor‐Grown Carbon Fiber with and without Magnetic Field

Takahashi, Tatsuhiro; Yonetake, Koichiro; Koyama, Kiyohito; Kikuchi, Tokio

doi:10.1002/marc.200350021

Cited by 57 publications

(39 citation statements)

References 13 publications

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“…It is well known that WAXD is one of powerful tools for characterizing the degree of crystallite of CNTs aligned in polymer matrix [12][13][14]. Figure 3 shows the X-ray diffraction photographs taken from different X-ray incident directions for the rubber composite filled with 30 wt% CNTs aligned along the X-direction.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication of aligned carbon nanotube-filled rubber composite

et al. 2006

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Here we fabricated rubber composite sheets filled with 5wt% and 30wt% of highly aligned carbon nanotubes (CNTs) through conventional rubber technology. The alignment of CNTs was possibly derived from dragged shear force during the optimized milling process. The selective alignment of CNTs leaded to enhancement of elastic modulus, thermal conductivity, electrical conductivity, and electromagnetic shielding property compared to neat rubber sheet.

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Section: Resultsmentioning

confidence: 99%

“…Up to my knowledge, this is the first report on the production of the aligned carbon nanotube-filled rubber even though there were a few reports on the alignment of carbon nanotubes in polymer using the magnetic fields [12][13][14].…”

Section: Introductionmentioning

confidence: 93%

Fabrication of aligned carbon nanotube-filled rubber composite

et al. 2006

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“…Many researches on the enhanced thermal, mechanical and electrical properties and EMI shield effect for VGCF base composites were conducted [15,[20][21][22][23][24][25][26][27][28]. However, the study on the unique nanocomposite with carbon nanotubes and shape memory polymer (SMP) is just on the way.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer

Zhang

et al. 2007

Composites Science and Technology

280

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The nanocomposites with carbon nanotubes (CNTs) and shape memory polymer (SMP) were developed for electrical applications. The specimens with different CNTs weight fractions were prepared. Their electrical resistivities and electromagnetic interference (EMI) shielding effectiveness (SE) were investigated. The electrical resistivity was examined by four-probe method at different testing temperatures of 25, 35, 45, 55 and 65 ˚C around glass transfer temperature (T g ).As a result, for the developed nanocomposites, even lower weight fraction of CNTs could achieve a high level of conductivity and a low percolation threshold for CNTs content was confirmed. The electrical resistivity for the developed nanocomposites is dependant obviously on temperature with a linear relation like metals. The interconnected conducting network was formed more easily than other fillers. For the EMI SE measurements, a near-field antenna measurement system was used.The experiments to evaluate EMI SE were carried out in three different frequency bands, 8~26.5 GHz (K band), 33~50 GHz (Q band) and 50~75 GHz (V band). The EMI SE of CNT/SMP nanocomposites have a strong dependence of carbon nanotube content and the specimen thickness at all of three frequency bands. The higher frequency, the larger EMI SE. For the materials with 5.5wt% VGCFs both experiment and analysis will agree well, and theoretical prediction proposed for EMI SE may be useful.

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“…8,9 Several methods of aligning CNTs in the polymers have been considered in the past 8,[10][11][12][13][14][15][16] but using a magnetic field is one particularly interesting technique. 9,[17][18][19] However, because of the extremely low magnetic susceptibility of CNTs (∼10 −6 emu/g at room temperature), the dipole moment induced in the magnetic field is not sufficient for rotating CNTs in the viscous matrix. Therefore CNTs need to be somehow magnetically activated.…”

Section: Introductionmentioning

confidence: 99%

Magnetic alignment of SWCNTs decorated with Fe3O4 to enhance mechanical properties of SC-15 epoxy

et al. 2013

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We report significant improvement in mechanical properties of SC-15 epoxy when reinforced with decorated nanotubes and cured in a modest magnetic field. The chemical synthesis and field curing process is a low cost and relatively easy technique to impose strong magnetic anisotropy into the system without the need of a superconducting magnet. SWCNT(COOH)s were decorated with Fe3O4nanoparticles through a sonochemical oxidation process and then dispersed into SC-15 epoxy at 0.5 wt% loading. The admixture was cured for 6 hours in a magnetic field of 10 kOe followed by an additional 24 hours of post curing at room temperature. Control samples were prepared in a similar manner but without the application of the magnetic field. Mechanical tests performed on field-cured samples indicated that tensile strength and modulus increased by 62%and 40%. Most importantly, modulus of toughness, fracture strain, and modulus of resilience improved by 346%, 165%% and 170%, respectively. Such enhancement in mechanical properties was attributed to changes in polymer morphology, partial alignment of nanotubes in the field direction, and sliding at the polymer-nanotube interface. Detailed characterization of the system with XRD, TEM, DMA, and Magnetometry are described in the paper.

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Polycarbonate Crystallization by Vapor‐Grown Carbon Fiber with and without Magnetic Field

Cited by 57 publications

References 13 publications

Fabrication of aligned carbon nanotube-filled rubber composite

Fabrication of aligned carbon nanotube-filled rubber composite

Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer

Magnetic alignment of SWCNTs decorated with Fe3O4 to enhance mechanical properties of SC-15 epoxy

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