Microspectroscopic evaluations of the interfacial degradation by absorbed water in a model composite of an aramid fibre and unsaturated polyester

Kawagoe, Makoto; Takeshima, Mikio; Nomiya, M.; Qiu, Jianhui; Morita, Mikio; Mizuno, Wataru; Kitano, Hiromi

doi:10.1016/s0032-3861(98)00371-1

Cited by 36 publications

(18 citation statements)

References 22 publications

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“…This can be explained by the following reasons. (1) With the incorporation of LCMC into UP matrix, the propagation of the cracks into UP matrix was hindered to a certain degree by the GF. (2) The crosslinking reaction make the GF/matrix interfacial adhesion become stronger, hence the wear resistance was improved.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Wear and mechanical properties of reactive thermotropic liquid crystalline polymer/unsaturated polyester/glass fiber hybrid composites

Wei

et al. 2006

J of Applied Polymer Sci

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To improve the performance of unsaturated polyester (UP) under cold-heat alternate temperature, selfsynthesized reactive thermotropic liquid crystalline polymer (TLCP)-methacryloyl copolymer (LCMC), UP, and glass fiber (GF) hybrid composites was prepared by molding technology. The apparent activation energy and crystal behavior analysis of LCMC/UP blends were investigated by Differential scanning calorimetry and X-ray diffraction (XRD), respectively, the results showed that the addition of LCMC can reduce apparent activation energy and accelerate the curing reaction of UP, the XRD analysis indicated that the crystal phase of LCMC still exist in the blends after blending with UP. The effect of LCMC content on the properties of LCMC/UP/GF hybrid composites such as impact strength, bending strength, and ring-on-block wear were also investigated through static mechanical tests and wear tests. The mechanical properties of hybrid composites increased significantly because of the addition of LCMC. The wear tests showed that LCMC can improve the wear resistance of the UP/GF/LCMC hybrid composites even though the content of LCMC was at a relatively low level (5-7.5 wt %). This makes it possible to develop novel kind of UP-based materials with good wear resistance for various applications. The Worn surface was observed by scanning electron microscopy (SEM) and the mechanism for the improvement is discussed in this paper.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Wear and mechanical properties of reactive thermotropic liquid crystalline polymer/unsaturated polyester/glass fiber hybrid composites

Wei

et al. 2006

J of Applied Polymer Sci

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“…On the other hand, in long-term applications, moisture and temperature have been shown to have deleterious effects on performance of advanced carbon/epoxy composites (8) . Some studies have also shown variation in residual stresses under hygrothermal exposure of aramid fiber/epoxy (4) and aramid fiber/polyester (5) single-fiber composites. These studies were under constant environments and experiments performed under variable environmental conditions were not found.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Fiber Stresses on Cyclic Changes of Temperature and Water Absorption in Carbon/Epoxy Single-Fiber Model Composites

Miyake

Futamura

Fujiyoshi

et al. 2010

JMMP

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In this study, we examine the variation in residual stresses in polymer matrix composites with cyclic changes in hygrothermal environments by measuring the axial stresses in the fiber of single-carbon fiber/epoxy resin model composites using Raman microspectroscopy. To change the temperature and water absorption in the specimens separately and simultaneously, the specimens were (1) heated and cooled at atmospheric environment, (2) immersed in water and dried at room temperature, and (3) immersed in hot water (80°C) and cooled to room temperature in water and then dried. All specimens were thus restored to their initial states and then evaluated. In the cases of (1) and (2), the fiber stresses reverted to almost the same as their initial states, but in the case of (3) the axial stress after hygrothermal cyclic change was more compressive compared to the initial state. The differences among the results of the three cases are discussed based on the fiber stresses at elevated temperature, which were evaluated by Raman microspectroscopic measurement performed at temperatures ranging from room temperature to those above the glass-transition temperature of the epoxy matrix resin.

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“…When polymeric materials are exposed to humid environment, even a small amount of water-uptake can cause detrimental changes in physical and mechanical properties, such as glass temperature and modulus [1]. Therefore, there has been an increasing interest for the characterization of sorbed water in polymers by various spectroscopic techniques such as UV-Vis [2,3], fluorescence [4], NIR [5], NMR [6], and dielectric techniques [7].…”

Section: Introductionmentioning

confidence: 99%

Fluorescence and NIR spectroscopic study on the water interaction in polycarbonate film

Kim

Sung

2008

Fibers Polym

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Water interactions in polycarbonate films have been studied using fluorescence and NIR Fourier transform spectroscopy. During water sorption process, the fluorescence emission spectra showed sensitive changes with the peak at 332 nm red shifted by 18 nm with water sorption. This red-shifted peak could be due to phenyl-2-phenoxybezoate, which is one of two major thermal degradation products in polycarbonate. In the spectra of phenyl-2-phenoxybenzoate in dimethyl formamide solution, a progressive red shift was also observed with the water addition. By using the NIR spectra, hydrogen-bonding interactions of the sorbed water with polycarbonate were investigated. It was found that water can be analyzed as free water S o or singly hydrogen bonded water, S 1 while double hydrogen bonded water was negligible. During water immersion, most water species which are present as S o species decrease slightly, with a small increase in S 1 species. During desorption, S o species decrease sharply, while S1 species is reduced gradually. Two examples of S 1 structure in water-sorbed polycarbonate are proposed.

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Microspectroscopic evaluations of the interfacial degradation by absorbed water in a model composite of an aramid fibre and unsaturated polyester

Cited by 36 publications

References 22 publications

Wear and mechanical properties of reactive thermotropic liquid crystalline polymer/unsaturated polyester/glass fiber hybrid composites

Wear and mechanical properties of reactive thermotropic liquid crystalline polymer/unsaturated polyester/glass fiber hybrid composites

Dependence of Fiber Stresses on Cyclic Changes of Temperature and Water Absorption in Carbon/Epoxy Single-Fiber Model Composites

Fluorescence and NIR spectroscopic study on the water interaction in polycarbonate film

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