Investigation of the long term effects of moisture on carbon fibre and epoxy matrix composites

Zafar, Amad; Bertocco, Fabio; Schjødt-Thomsen, Jan; Rauhe, Jens Christian M.

doi:10.1016/j.compscitech.2012.01.010

Cited by 204 publications

(150 citation statements)

References 14 publications

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“…The presence of water in a polymeric system leads to a host of damaging consequences such as degradation of mechanical strength and modulus [14,15] hygroscopic swelling [16][17][18] and the accompanying mismatched swelling stresses, reduction of dielectric strength [19,20], and increase in relative permittivity [21][22][23][24]. The latter is detrimental to the performance of advanced semiconductors that use porous polymers as dielectric materials.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium moisture content of a crosslinked epoxy network via molecular dynamics simulations

Stoffels

Staiger

Bishop

2016

Modelling Simul. Mater. Sci. Eng.

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Abstract. This study presents molecular dynamics (MD) simulation methods for determining the solubility limit of water in a crosslinked epoxy network. Procedures are first presented for dynamically crosslinking an epoxy network consisting of diglycidyl ether bisphenol A (DGEBA) and isophorone diamine (IPD). Water molecules are then introduced into the crosslinked DGEBA-IPD structure. The excess chemical potential for the absorbed water was determined through combining thermodynamic integration and Widom's test particle insertion methods. The limiting moisture uptake of the epoxy structure was determined through comparing the reduced chemical potential of the water held within the epoxy to that of pure water. The DGEBA-IPD epoxy system was found to have a moisture solubility of 3.50-3.75 wt.% when immersed in water at 300 K.

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Section: Introductionmentioning

confidence: 99%

Equilibrium moisture content of a crosslinked epoxy network via molecular dynamics simulations

Stoffels

Staiger

Bishop

2016

Modelling Simul. Mater. Sci. Eng.

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“…However, for higher concentration in case of FC 1 , the hardness value got deteriorated than FC 0.75 though it was still higher than other specimens. Reduction in hardness value at FC 1 may be due to the formation of voids due to addition of higher nanoparticle contents [20]. In addition, higher concentrated MWNTs may act as stress concentrator in the composite which can be the cause behind the decrement in mechanical properties.…”

Section: 3hardnessmentioning

confidence: 99%

Scheming of microwave shielding effectiveness for X band considering functionalized MWNTs/epoxy composites

Bal

Saha

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Thermal properties of epoxy composites filled with boric acid P M Visakh, O B Nazarenko, Yu A Amelkovich et al. -Microstructural analysis using X-ray computed tomography (CT) Abstract. Present typescript encompasses anextraordinary electrical and mechanical behaviors of carboxylic (-COOH) functionalized multiwall carbon nanotube (MWNTs)/epoxy composites at low wt.% (0.5, 0.75, 1wt.%). Functionalization on the surface of the nanotube assists MWNTs in dispersing it into epoxy polymer in a respectable manner. Fabricated composites are exposed to different characterization techniques in order to examine the overall physical properties. Microwave shielding effectiveness (SE) for X band (8-12 GHz) and the flexural properties have been premeditated to predict the electrical and mechanical performances.It was found that the total SE of the nanocomposites was increased with the positive gradient of MWNT contents. The best result was recorded for 1 wt.% MWNT loading (SE of about 51.72 dB).In addition, incorporation of nanofillers enhanced the flexural modulus, flexural strength and micro-hardness of the resulting composites while comparing with neat epoxy. Nanocomposites with 0.75 wt.% MWNT loading demonstrated an incrementof 101% in modulus than that of neat epoxy. Theincrement in mechanical properties was due to achievement of good dispersion quality, effective bonding between MWNTs and epoxy polymer analyzed by micrographs of fracture surfaces.

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“…4. The salt concentration in specimen immersed in sea water is less than that of actual sea water as a result an osmotic pressure is created which acts against the water absorption (Zafar et al, 2012). …”

Section: Water Absorption Testmentioning

confidence: 99%

Effect of sawdust impregnation on long coir fibers reinforced with epoxy matrix

Nair

2018

Int. j. adv. appl. sci.

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The purpose of this study is to improve mechanical property of long coir fibers of length 100-150mm using well graded sawdust filler and to scrutinize viability when subjected to distill and sea water conditions for calculated duration. Study involves fabricating eco-friendly composite specimens by maintaining optimum percentage of natural fibers and fillers without compromising on mechanical strength. The composites of different proportions by percentage of matrix (85%, 80%, 75%, 70%), reinforcement (15%, 15%, 15%, 15%), and filler (0%, 5%, 10%, 15%) by mass is developed by hand layup method and compared for their mechanical properties in dry, distilled and sea water conditions. Mechanical properties of coir composite materials improved in addition to sawdust fillers up to certain percentage. In dry condition tensile, flexural and hardness was observed. A maximum tensile and flexural modulus of 7.61Gpa and 2.16Gpa respectively was observed. Higher water absorption was noticed in specimen with higher filler percentage than the specimen with no filler. This is due to hydrophilic nature of sawdust and coir. Specimens immersed in distilled and sea water observed a slump by certain percentage in their strength with increase in fillers. Efficient utilization of filler has improved mechanical performance up to certain percentage when compared to specimen with no filler. As the filler percentage increased above 5% due to the higher fiber length and cluster behavior of coir, resistant in resin penetration was observed as a result specimen turned out to be more and more redundant.

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Investigation of the long term effects of moisture on carbon fibre and epoxy matrix composites

Cited by 204 publications

References 14 publications

Equilibrium moisture content of a crosslinked epoxy network via molecular dynamics simulations

Equilibrium moisture content of a crosslinked epoxy network via molecular dynamics simulations

Scheming of microwave shielding effectiveness for X band considering functionalized MWNTs/epoxy composites

Effect of sawdust impregnation on long coir fibers reinforced with epoxy matrix

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