The Influence of Water on the Epoxy-Resin-Glass Interphases

Marzi, T.; Schröder, Ulrich K. O.; Heß, Michael; Kosfeld, Reinhold

doi:10.1557/proc-170-123

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Papanicolaou and Pappa [13] further found that, although plasticization caused an increase in the value of the loss tangent, the formation of microcavities due to accelerated deterioration through immersion at higher temperatures resulted in a decrease in tan due to changes in morphology, which again can be seen in Table 2 and can be correlated with irreversible damage, especially at the higher temperature levels in the form of matrix-crack coalescence, microvoid formation and growth, fiber-matrix debonding, and even fiber level degradation (as seen in Figure 4(c)). A further examination of Table 2 shows that the value of tan increases for a given time of immersion with the temperature of immersion, which follows earlier results reported by Papanicolaou and Pappa [13], and Marzi et al [25].…”

Section: Resultssupporting

confidence: 88%

Dynamic Mechanical Analysis of the Effect of Water on E-glass-Vinylester Composites

Karbhari

2006

Journal of Reinforced Plastics and Composites

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Dynamic mechanical thermal analysis (DMTA) is used to investigate the degradation response of unidirectional pultruded E-glass-vinylester due to immersion in deionized water over a range of temperatures below its glass transition. It is found that moisture uptake which is overall Fickian in nature results in initial plasticization of the bulk matrix followed by matrix cracking, crack coalescence, fiber-matrix debonding, and irreversible matrix degradation. Post-cure, due to interaction with water and temperature, is noted to take place in the first 10-15 weeks, and competes with degradation mechanisms. Post-cure can be noted through large increases in storage modulus as well as in the loss tangent peak. A link can be drawn between storage modulus in the rubbery region, and the inter-crosslink molecular weight to further elucidate relative effects of post-cure and chain scission, which is seen on longer periods of immersion, but accelerated by higher temperatures.

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Section: Resultssupporting

confidence: 88%

Dynamic Mechanical Analysis of the Effect of Water on E-glass-Vinylester Composites

Karbhari

2006

Journal of Reinforced Plastics and Composites

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“…Various aspects of the phenomenon of moisture absorption in polymer composites and its effect on their mechanical properties have been reported by many scientists 4–7. Detailed studies on the kinetics of water sorption and influence of water on the interphases in plastics and rubber composites have been reported 8–10. Sapieha et al11 investigated the swelling of cellulosic fibers in composites and showed that water sorption is a complex phenomenon that requires in‐depth study.…”

Section: Introductionmentioning

confidence: 99%

Water‐sorption kinetics in oil palm fibers

Sreekala

George

Kumaran

et al. 2001

J Polym Sci B Polym Phys

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Oil palm fibers represent a very abundant and natural resource for raw materials that can be efficiently utilized as reinforcement in polymers. The sorption characteristics of two types of oil palm fibers—oil palm empty‐fruit‐bunch (OPEFB) fiber and oil palm mesocarp fiber‐in distilled water, mineral water, and water containing salt at four different temperatures were investigated. The uptake of water decreased with an increase in temperature. The OPEFB fiber showed higher sorption than the mesocarp fiber. This was due to the uptake associated with the capillary action in the OPEFB fiber. The thermodynamic parameters of the sorption process were calculated. © 2001 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 39: 1215–1223, 2001

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