Effect of moisture and electronic packaging exhalates on the electrical conductivity of epoxy laminate

Singh, Dharmendra; Kumar, Amit; Tayal, V. P.; Sanyal, Biplab

doi:10.1007/bf00547484

Cited by 16 publications

(8 citation statements)

References 1 publication

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“…During long-term sorption process, redistribution and regrouping of water molecules occurs leading to ionic conduction, which adds to the electric conductivity of nanocomposites. Similarly to the case of conventional fiber reinforced composites [27][28][29], this fact is explained in terms of a heterogeneous system (sample + water molecules forming conducting paths). Despite a lack of knowledge about the conductivity level of the absorbed water phase, it seems reasonable to assume that conditioning in distilled water can contribute to the decrease of resistivity.…”

Section: Resultsmentioning

confidence: 96%

Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Starkova

Mannov

Schulte

et al. 2015

Composites Science and Technology

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Section: Resultsmentioning

confidence: 96%

Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Starkova

Mannov

Schulte

et al. 2015

Composites Science and Technology

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“…It is widely believed that polymer adhesives usually suffer from poor mechanical strength and poor adhesion, especially on metal substrates 1. Additionally, polymer adhesives, such as epoxy adhesives, absorb water easily when they are continually exposed to humid conditions 3, 4. The absorbed water may degrade the adhesive joints by (1) inducing plasticization and/or hydrolysis of the adhesives, (2) inducing stresses in the adhesive/adherent interface, and (3) causing the formation of hydrates on the metal adherent 5…”

Section: Introductionmentioning

confidence: 99%

Wedge test of carbon‐nanotube‐reinforced epoxy adhesive joints

Tong

Critchlow

2008

J of Applied Polymer Sci

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Epoxy adhesives reinforced with carbon nanotubes (CNTs) were developed. The distribution of the CNTs in the epoxy matrix was observed with transmission electron microscopy. Joints were formed by unclad 2024-T3 aluminum adherents bonded with the CNT-filled epoxy adhesives. The durability of the joints was studied with a wedge test under water at 60C. The addition of CNTs to the epoxy greatly improved the adhesive joint durability. The initial crack length of the joint with 1 wt % CNTs, which was obtained before the wedge specimen was put into water, was only about 7% of that with neat epoxy. After immersion of the specimens in 60 C water, the joint with neat epoxy failed after 3 h, but all of the joints adhered with different fractions of CNTs were still bound together after the experimental time of 90 h. The significant enhancement by CNTs of the adhesive joint durability was mainly attributed to the high mechanical properties of the CNTs and their ability to resist water. Nevertheless, the experimental results also reveal that the durability of the joints showed an optimum value at approximately 1 wt % CNTs, beyond which a decrease in the property was observed. In addition, the failure mechanism of the joints was also investigated in terms of interfacial failure and cohesive failure. Cohesive dominated failure was found for the joint bonded with 1 wt % CNT-filled epoxy.

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“…It has been proposed that the transport of moisture bellow T g is a three‐stage process: (i) diffusion of water through the bulk of the polymer network, (ii) absorption of moisture on the surface of vacuoles that define the excess free volume of the glassy structure, and (iii) through hydrogen bond formation between hydrophilic groups associated with hydroxyl or amine groups attached to the polymer chain and the water molecules. The available free volume in the resin influences the water equilibrium concentration and can also occupy microvoids and other morphological defects . Various models have been proposed to describe the kinetics of water diffusion.…”

Section: Introductionmentioning

confidence: 99%

The Effect of CNT‐modified matrix of cyanate ester CFRPs on the hydrothermal behavior of the material. Evaluation of the water uptake using electrical resistance measurements

et al. 2014

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In this work, reference and nanomodified unidirectional cyanate matrix, carbon fiber-reinforced polymers (CFRPs), were exposed to distilled water at 80 C. Water uptake was investigated as a function of the carbon nanotube CNT wt% content up to saturation level. In parallel the variation of glass transition temperature (T g ) was also monitored using dynamic mechanical analysis tests. The distilled water absorption process was modeled following the Fick's law, and the experimental results were found to be in very good agreement with the theoretical predictions up to saturation. Finally, during the tests and, at defined time intervals the variation of the electrical conductivity of the materials under investigation was studied and a correlation between the water absorption and the variation of the electrical conductivity was established. It was shown that the presence of CNTs into the cyanate matrix affects the water absorption mechanism, since an important amount of additional interfaces has been introduced.

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Effect of moisture and electronic packaging exhalates on the electrical conductivity of epoxy laminate

Cited by 16 publications

References 1 publication

Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Strain-dependent electrical resistance of epoxy/MWCNT composite after hydrothermal aging

Wedge test of carbon‐nanotube‐reinforced epoxy adhesive joints

The Effect of CNT‐modified matrix of cyanate ester CFRPs on the hydrothermal behavior of the material. Evaluation of the water uptake using electrical resistance measurements

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