Influence of Rapid Homogeneous Irradiation of Electron Beam with Low Energy (RHIEBL) on Water Absorption into Nylon6

Nishi, Yoshitake; Suenaga, Ryuichi; Vautrin, Alain

doi:10.2320/matertrans.mra2008151

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…Since the Al addition to composites dipped in hot salt solution gradually converted from a surface controlled system to mass transport control in the nylon6 matrix, the Al-addition should change the reaction index (n) of the overweight of composites dipped in hot salt solution. (8) The aluminum particles in composites attracted both Na and Cl ions, which attracted water molecules. When the difference between n values was not large, the k values of composites (from 20 to 40 vol%Al) dipped in hot salt solution were higher than that of 40 vol%Al in hot distilled water.…”

Section: Resultsmentioning

confidence: 99%

“…The absorption rate of distilled water is strongly dominated by mass transport, which is generally controlled by both diffusion in the nylon6 matrix, 7) and mass transfer at the interface in nylon6 composites. 8) Salt solutions pose serious environmental problems when it utilizes exteriors in civil engineering and interiors of automobiles. 9,10) Therefore, the influence of dipping in hot salt solution (3 mass%NaCl in distilled water) at 373 K (near the boiling point) on the overweight of nylon6 composites with aluminum powders dispersed has been precisely investigated with the use of general kinetic analysis.…”

Section: Introductionmentioning

confidence: 99%

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Overweight of Nylon6 Composites Dispersed with Aluminum Powders by Dipping in Hot Salt Solution (3 mass%NaCl in Distilled Water)

2009

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The influence of dipping in hot salt solution on water absorption in nylon6 composites with dispersed aluminum powders was investigated. Dipping in hot salt solution (3 mass%NaCl in distilled water) for 10 5 s at 373 K increased the overweight of composite samples, whereas the addition of aluminum with dispersed powders (A1-addition) from zero to 40 vol%Al decreased the overweigh of the sample. Based on the experiment results and kinetic analysis, aluminum powder dispersion in nylon6 decreased the saturated overweigh of composites at infinite time. Both hot salt dipping and Al addition increased the reaction index (n). The Al addition apparently increased the n value of composites with less than 20 vol%Al in salt solution, as well as with less than 30 vol%Al in distilled water. The A1 addition apparently increased the kinetic constant (k) at less than 20 vol%Al in hot salt solution. However, the Al addition decreased the k value of composites at more than 30 vol%Al in hot salt dipping, as same as that of the composites dipped in hot distilled water. Compared with dipping in distilled water, dipping in hot salt solution apparently decreased the saturated overweigh and remarkably increased both n and k values of nylon6 composites with 10 and 20 vol%Al. Since Electron Probe Micro Analyzer (EPMA) analysis could not clearly detect sodium (Na) in the nylon6 matrix, the reaction rate of nylon6 composites dipped in hot salt solution was probably dominated by an interface control process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overweight of Nylon6 Composites Dispersed with Aluminum Powders by Dipping in Hot Salt Solution (3 mass%NaCl in Distilled Water)

2009

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“…20) To control the absorption rate, mechanics of the absorption of polymers and their composites should be precisely determined by using the general kinetic analysis.…”

Section: Reaction Index (N)mentioning

confidence: 99%

Mass Gain of Carbon Fiber Reinforced Polyimide (CFRP) by Dipping in Hot Distilled Water

et al. 2012

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Influence of isothermal dipping in hot distilled water for 200 ks on the mass gain of carbon fiber reinforced polyimide (CFRP) was investigated. Dipping in distilled water raised the mass gain. Based on the kinetics equation, both reaction index (n) and kinetic constant (k) were obtained. Since the n value is approximately 0.6 from 333 to 373 K, the reaction mode was independent on the absorption temperature. Based on the results and discussion, the water absorption was probably the directional mass transport through the fiber/polyimide cylindrical interface. On the other hand, Arrhenius linear relationship between logarithmic k (log k) and reciprocal dipping temperature (1/T) was obtained. The apparent activation energy estimated by the slope of water absorption in the CFRP was approximately equal to the activation energy of self-diffusion coefficient of water molecule. Mass gain of CFRP (CF/PI) dipped in distilled water for 100 ks at 373 K probably enhanced the molecules' density induced by water molecules' intrusion among polyimide polymers, resulting in enhancement of (d·/d¾) max and fracture stress. On the other hand, the mass gain by dipping for 200 ks at 373 K enriched the water concentration in polyimide matrix. Thus, it was assumed to enhance the intermolecular distance of polyimide polymers and then to reduce the intermolecular force among polyimide polymers, resulting in a drop of (d·/d¾) max of CFRP dipped for 200 ks. On the other hand, the dipping for 200 ks probably raised the intermolecular force between water molecules and polyimide polymers, resulting in remarkable enhancements of the fracture strain, fracture energy and impact value of the CFRP.

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“…To evaluate change in bonding state in ABS polymer reacted by acetone molecules, X-ray photoelectron spectroscopy (XPS; Quantum2000, ULVAC) analysis 15) was performed under XPS condition. The measurement area of Al target was 100 mm Â 100 mm.…”

Section: Xps and Esr Measurementsmentioning

confidence: 99%

Impact Value of High Electric Conductive ABS Composites with Copper Powder Dispersion Prepared by Solution-Cast Method

et al. 2010

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Copper powder dispersed acrylonitrile butadiene styrene (ABS) composites were prepared by the solution cast method. Although the addition of Cu greatly enhanced the electric conductivity at the critical volume fraction (19:0þ=À1:0 vol%Cu) from the insulator to the electric conductor, the decrease in the Charpy impact value was gradual. Since the impact value of the ABS polymer prepared by the solution cast method was 1.75 times larger than that before treatment, it is clear that the solution casting improved the impact value. When the volume fraction of Cu powders of high electric conductive ABS composites was from 20 to 30 vol%Cu, the impact value was 7 kJm À2 . The moderated impact value was not only 44% of that of pure ABS polymer before solution casting, but was also higher than that of dispersed nylon6 composites (2 kJm À2 ) utilizeed for practical exteriors.

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Influence of Rapid Homogeneous Irradiation of Electron Beam with Low Energy (RHIEBL) on Water Absorption into Nylon6

Cited by 4 publications

References 15 publications

Overweight of Nylon6 Composites Dispersed with Aluminum Powders by Dipping in Hot Salt Solution (3 mass%NaCl in Distilled Water)

Overweight of Nylon6 Composites Dispersed with Aluminum Powders by Dipping in Hot Salt Solution (3 mass%NaCl in Distilled Water)

Mass Gain of Carbon Fiber Reinforced Polyimide (CFRP) by Dipping in Hot Distilled Water

Impact Value of High Electric Conductive ABS Composites with Copper Powder Dispersion Prepared by Solution-Cast Method

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