Production and assessment of polycarbonate composites reinforced with vapour-grown carbon fibres

Carneiro, O. S.; Covas, J. A.; Bernardo, C. A.; Caldeira, G.; Hattum, F. W. J. van; Ting, Jyh‐Ming; Alig, Robert L.; Lake, Max L.

doi:10.1016/s0266-3538(97)00138-3

Cited by 131 publications

(57 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CNFs are highly graphitic fibers produced by a catalytic vapor deposition process and have been widely used as reinforcements for polymers like polyethylene [1], polypropylene [2,3], polycarbonate [4], nylon [5], and poly(methyl methacrylate) [6] in numerous high-technology applications. CNTs have high mechanical and electrical properties and ultra high TC [7,8] and CNT-based composites are being studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of ethylene vinyl acetate copolymer/nanofiller blends

Ghose

Watson

Connell

et al. 2008

Composites Science and Technology

View full text Add to dashboard Cite

To reduce weight and increase the mobility, comfort, and performance of future spacesuits, flexible, thermally conductive fabrics and plastic tubes are needed for the Liquid Cooling and Ventilation Garment. Such improvements would allow astronauts to operate more efficiently and safely for extended extravehicular activities. As an approach to raise the thermal conductivity (TC) of an ethylene vinyl acetate copolymer (Elvax™ 260), it was compounded with three types of carbon based nanofillers: multi-walled carbon nanotubes (MWCNTs), vapor grown carbon nanofibers (CNFs), and expanded graphite (EG). In addition, other nanofillers including metallized CNFs, nickel nanostrands, boron nitride, and powdered aluminum were also compounded with Elvax™ 260 in the melt at various loading levels. In an attempt to improve compatibility between Elvax™ 260 and the nanofillers, MWCNTs and EG were modified by surface coating and through noncovalent and covalent attachment of organic molecules containing alkyl groups. Ribbons of the nanocomposites were extruded to form samples in https://ntrs.nasa.gov/search.jsp?R=20070032917 2018-05-10T16:24:41+00:00Z which the nanofillers were aligned in the direction of flow. Samples were also fabricated by compression molding to yield nanocomposites in which the nanofillers were randomly oriented.Mechanical properties of the aligned samples were determined by tensile testing while the degree of dispersion and alignment of nanoparticles were investigated using high-resolution scanning electron microscopy. TC measurements were performed using a laser flash (Nanoflash™) technique. TC of the samples was measured in the direction of, and perpendicular to, the alignment direction. Additionally, tubing was also extruded from select nanocomposite compositions and the TC and mechanical flexibility measured.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of ethylene vinyl acetate copolymer/nanofiller blends

Ghose

Watson

Connell

et al. 2008

Composites Science and Technology

View full text Add to dashboard Cite

show abstract

“…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

278

View full text Add to dashboard Cite

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.

show abstract

“…Cho and Paul increased the loading of organoclay in a nylon 6-organoclay nanocomposites, and found improvements in strength and modulus and a loss in ductility as the loading increased [22]. Carneiro et al found that more vapor grown carbon fibers (VGCF) increased the modulus and yield stress, but decreased the impact strength when varied from 0-20 wt% VGCF [23]. Bekyarova et al studied multi-scale carbon nanotube-carbon fiber reinforcement in an epoxy resin.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Characterization of Physical Properties for Multi-Scale Polymer Composites Under Various Processing Conditions

Lederer

Bigio

Bruck

et al. 2012

Volume 3: Design, Materials and Manufacturing, Parts A, B, and C

View full text Add to dashboard Cite

There is a great interest in using micro and nano scale ingredients as fillers to create composites with enhanced physical properties. This thesis research explores the improvements these fillers offer with focus on combining both micro and nano ingredients to make multi-scale polymer composites. This investigation reveals the interplay of ingredient mixing, microstructural evolution, and processing conditions and characterizes the improvements of thermal and mechanical properties. This data is used to develop fundamental processing-structure-property relationships of these multi-scale composites across different concentrations of microscale and nanoscale ingredients and processing conditions in order to optimize their development.

show abstract

Production and assessment of polycarbonate composites reinforced with vapour-grown carbon fibres

Cited by 131 publications

References 7 publications

Thermal conductivity of ethylene vinyl acetate copolymer/nanofiller blends

Thermal conductivity of ethylene vinyl acetate copolymer/nanofiller blends

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

Characterization of Physical Properties for Multi-Scale Polymer Composites Under Various Processing Conditions

Contact Info

Product

Resources

About