Experimental investigations and model study of moisture behaviors in polymeric materials

Fan, Xuejun; Lee, S. W. Ricky; Han, Qiang

doi:10.1016/j.microrel.2009.03.006

Cited by 151 publications

(81 citation statements)

References 29 publications

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“…The curve presented in Figure 4 is similar to the curve obtained by other authors who have studied water absorption kinetics in natural materials [4,16,26,27,34,37]. It was noticed that the water absorption kinetics of the pith of Raffia vinifera takes place in two phases: the first phase rapidly takes place and enables reaching approximately 50% of the mass at saturation.…”

Section: Kinetics Of Watersupporting

confidence: 84%

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Modelling of the Water Absorption Kinetics and Determination of the Water Diffusion Coefficient in the Pith ofRaffia viniferaof Bandjoun, Cameroon

Mbou

Njeugna

Kémajou

et al. 2017

Advances in Materials Science and Engineering

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The present work focuses on the study of the water absorption phenomenon through the pith of Raffia vinifera along the stem. The water absorption kinetics was studied experimentally by the gravimetric method with the discontinuous control of the sampling mass at temperature of 30 ∘ C. The samples of 70 mm × 8 mm × 4 mm were taken from twelve sampling zones of the stem of Raffia vinifera. The result shows that the percentage of water absorption of the pith of Raffia vinifera increases from the periphery to the center in the radial position and from the base to the leaves in the longitudinal position. Fick's second law was adopted for the study of the water diffusion. Eleven models were tested for the modelling of the water absorption kinetics and the model of Sikame Tagne (2014) is the optimal model. The diffusion coefficients of two stages were determined by the solution of the Fick equation in the twelve sampling zones described by Sikame Tagne et al. (2014). The diffusion coefficients decreased from the center to the periphery in the radial position and from the base to the leaves in the longitudinal position.

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Section: Kinetics Of Watersupporting

confidence: 84%

“…To simplify the resolution of (2), it is supposed that the diffusion coefficient is independent of the space direction [33,34]. This hypothesis enables us to write (2) in the following form:…”

Section: Mass Diffusion Theory Through Solidmentioning

confidence: 99%

Modelling of the Water Absorption Kinetics and Determination of the Water Diffusion Coefficient in the Pith ofRaffia viniferaof Bandjoun, Cameroon

Mbou

Njeugna

Kémajou

et al. 2017

Advances in Materials Science and Engineering

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“…As time progresses, however, the experimental curves start to deviate from the Fick's model, revealing non-Fickian behavior. The transition from Fickian behavior to non-Fickian diffusion is quite subtle: the moisture absorption curves remain continuous without any observable jumps in moisture content, which is different from some of the results reported in the literature [28,47]. Two-stage moisture diffusion behavior has been reported in the literature for various materials [28,47].…”

Section: Non-fickian Diffusion Under High Relative Humiditycontrasting

confidence: 77%

“…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: 99%

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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“…Fan [9] discussed two mechanisms of absorption. The first being due to the absorption of water molecules in the free or nano-cavities and the second consists on the formation of a hydrogen bond with the water molecule and the polymer chains due to their molecular polarity.…”

Section: -2mentioning

confidence: 99%

Hygrothermal ageing effect on mechanical properties of FRP laminates

Larbi

Bensaada

Bilek

et al. 2015

AIP Conference Proceedings

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Experimental investigations and model study of moisture behaviors in polymeric materials

Cited by 151 publications

References 29 publications

Modelling of the Water Absorption Kinetics and Determination of the Water Diffusion Coefficient in the Pith ofRaffia viniferaof Bandjoun, Cameroon

Modelling of the Water Absorption Kinetics and Determination of the Water Diffusion Coefficient in the Pith ofRaffia viniferaof Bandjoun, Cameroon

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

Hygrothermal ageing effect on mechanical properties of FRP laminates

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