Mechanism of Moisture Diffusion, Hygroscopic Swelling, and Adhesion Degradation in Epoxy Molding Compounds

Shirangi, M.H.; Michel, B.

doi:10.1007/978-1-4419-5719-1_2

Cited by 85 publications

(64 citation statements)

References 40 publications

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“…Drying the specimens shifted the crack back to the laminate failure and confirmed swelling as a crucial parameter. The deleterious effects of swelling have also been outlined by other researchers and they are believed to exert additional shear stresses at the interface [152,153].…”

Section: Effect Of Moisture On Adhesively Bonded Jointsmentioning

confidence: 91%

Environmental durability of adhesively bonded FRP/steel joints in civil engineering applications: State of the art

Heshmati

Haghani

Al‐Emrani

2015

Composites Part B: Engineering

188

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Section: Effect Of Moisture On Adhesively Bonded Jointsmentioning

confidence: 91%

Environmental durability of adhesively bonded FRP/steel joints in civil engineering applications: State of the art

Heshmati

Haghani

Al‐Emrani

2015

Composites Part B: Engineering

188

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“…The desorption process led to much larger diffusion coefficients for the given composite formulations. Microcracks formed in the composites due to fiber swelling and shrinking during absorption and desorption cycle contributed largely to the enlarged diffusion coefficient values in the desorption cycle (Shirangi et al 2008). Among the treated composites, samples with 2% ZnB had the largest Dm (equal to 9.79×10 -4 mm 2 •s -1 ), while samples with 2% AT had the lowest Dm (1.20×10 -4 mm 2 •s -1 ).…”

Section: Final MC and Diffusion Constantmentioning

confidence: 99%

Effect of Durability Treatment on Moisture Sorption Properties of Wood-Plastic Composites

Song

Zhou

et al. 2014

BioResources

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In this study, water absorption and desorption behaviors of wood-plastic composites (WPCs) treated with ultraviolet agents and zinc borate were investigated. Water diffusion characteristics in the composites were analyzed using a one-dimensional diffusion model. The mechanism of water sorption for all composites deviated from Fick's law of diffusion. Much larger diffusion coefficient values are observed from the desorption process when compared to the absorption process. Measured final equilibrium moisture content and calculated diffusion coefficients varied with sample formulation in a non-consistent manner; this indicated that the durability treatment used in the current study did not negatively affect the water sorption behavior of WPCs. The results of this study help to clarify the effect of durability treatment on the dynamic moisture sorption process of WPCs.

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“…However, there are many results reported in the literature showing that at higher temperature-humidity level over long exposure time, moisture diffusion in many epoxy molding compounds exhibit twostage diffusion behavior, and the saturated moisture content may not be repeatable nor reversible, but depends on its prior temperature-humidity exposure history [20,28,46,47]. For example, at IBM showed that moisture absorption-desorption behavior in a epoxy-glass material did not have reversibility but depend on the exposure history [46]: one sample was saturated at 85°C 80% RH first, followed by exposure at 65°C 30% RH; while a second sample was first saturated at 65°C 30% RH, followed by saturation at 85°C 80% RH.…”

Section: Environmental Exposure-induced Increase In C Satmentioning

confidence: 93%

“…Moisture also leads to weakened adhesion strength [19,20] and hygroscopic swelling [21,22], which increases package stresses. For example, the adhesion strength between the solder ball and some underfill materials can decrease by more than 70% upon long time exposure at 85°C and 85%RH [11].…”

Section: Introductionmentioning

confidence: 98%

In-situ characterization of moisture absorption-desorption and hygroscopic swelling behavior of an underfill material

2011

2011 IEEE 61st Electronic Components and Technology Conference (ECTC)

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Moisture absorption and hygroscopic swelling behavior of an underfill material were measured in-situ using the sorption TGA and the DMA-RH techniques, respectively. Results showed that moisture diffusion can be well described by Fick's law when the relative humidity (RH) is 60% or less, and the diffusivity exhibits an Arrhenius temperature dependence with an activation energy of ~ 0.56 eV. At 85% RH, non-Fickian diffusion behavior becomes apparent in the latter stage of the diffusion process. Increase in the saturated moisture content (C sat ) at 60%RH was observed after exposure at 85°C 85%RH, which is attributed to hygrothermal ageing induced damage in the material. In-situ DMA-RH results showed that hygroscopic swelling strain is significant comparing with the thermal expansion of the material, and the swelling strain at 60°C 60%RH is equivalent to the thermal strain over a ∆T of 100°C for T < T g . The coefficient of hygroscopic swelling (CHS) was calculated and the results showed that CHS is temperature dependent, and it increases with the increasing temperature. At higher humidity condition (85%RH or higher), the swelling strain deviates from its linear dependence on C sat and it increases faster than linear when C sat increases, which may also be attributed to hygrothermal ageing induced damage in the underfill material.

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Mechanism of Moisture Diffusion, Hygroscopic Swelling, and Adhesion Degradation in Epoxy Molding Compounds

Cited by 85 publications

References 40 publications

Environmental durability of adhesively bonded FRP/steel joints in civil engineering applications: State of the art

Environmental durability of adhesively bonded FRP/steel joints in civil engineering applications: State of the art

Effect of Durability Treatment on Moisture Sorption Properties of Wood-Plastic Composites

In-situ characterization of moisture absorption-desorption and hygroscopic swelling behavior of an underfill material

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