Effects of Thermal Shocks and Thermal Spikes on Hygrothermal Behavior of Glass—Polyester Composites

Bera, Tanusree; Mula, Suhrit; Ray, Pravat Kumar; Ray, Bankim Chandra

doi:10.1177/0731684409076732

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…The flexural properties of all the composites exhibit good recovery (exceeding 79%) upon re-drying, suggesting that the role of water as plasticiser has been removed or has a reversible physical process. As stated by Bera et al (2007) the redrying process reduces the plasticization effect in composite constituents. However, full recovery of the flexural properties could not be achieved.…”

Section: Flexural Propertiesmentioning

confidence: 91%

Accelerated Weathering and Water Absorption Behavior of Kenaf Fiber Reinforced Acrylic Based Polyester Composites

et al. 2020

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Non-woven kenaf fiber (KF) mat reinforced acrylic-based polyester resin composites were prepared by an impregnation process followed by compression molding. They were exposed to durability test of accelerated weathering and water absorption. Accelerated weathering test through UV irradiation caused modification in chemical, mechanical, surface appearance, and color change of the composites. Two competing reactions occurred throughout the exposure period, i.e., post-crosslinking and photo-oxidation process. FTIR analysis revealed that the former occurred at the early stage of exposure while the latter toward the end of the exposure, exhibited by an accentuated increase in carbonyl and vinyl index. The post-crosslinking process contributes to the improvement in flexural properties and thermal stability of the composites, whereas the oxidation process does not. SEM observation showed that the degradation by photo-oxidation resulted in the formation of voids and blisters on composite's sample. Water uptake of all composites was found to follow Fickian behavior. Good recoveries (exceeding 79%) of flexural properties were obtained upon re-drying. However, a significant reduction in flexural strength and modulus was obtained in the wet state condition. SEM observation revealed that full recovery was not possible because of the impairment of the-matrix interfacial region. Relatively higher flexural properties were exhibited by alkali-treated KF composites even after the durability test due to the improved strength and-matrix adhesion following the treatment.

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Section: Flexural Propertiesmentioning

confidence: 91%

Accelerated Weathering and Water Absorption Behavior of Kenaf Fiber Reinforced Acrylic Based Polyester Composites

et al. 2020

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“…In this significant work it was shown that constitutive equations for moisture absorption and moisture-induced dimensional changes can be obtained by means of an internal variable method on the basis of irreversible thermodynamics theory. Moreover, Bera et al [27] investigated the effects of thermal shocks and thermal spikes of hydrothermal behaviour of composites. Blikstad et al [28] studied the long-term moisture absorption in fibre-reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

Influence of moisture absorption on the flexural properties of composites made of epoxy resin reinforced with low-content iron particles

Sideridis¹,

Venetis²,

Kyriazi³

et al. 2017

Bull Mater Sci

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In this work, the effect of moisture absorption on the mechanical properties of particulate composite materials is studied. Moisture absorption constitutes a main parameter affecting the thermomechanical behaviour of composites, since it causes plasticization of the polymer matrix with a concurrent swelling. In the present work, the influence of water absorption on the flexural properties of particle-reinforced composites was thoroughly investigated. It was found that during the process of moisture absorption there exists a variation of the flexural properties closely related to the degradation of the mechanical behaviour of the composite, as well as the percentage amount of moisture absorbed. Experiments were carried out with composite made of epoxy resin reinforced with low-content iron particles. The variation of ultimate stress, breaking strain, deflection, elastic modulus and Poisson ratio due to water absorption was examined.

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“…Re-dried pure polyester and NPNCs have lesser mass loss than water-soaked specimens and greater mass loss than as-made specimens. Most of the water is driven out of the system for re-dried specimens, leading to recovery from swelling and plasticization 30 . The effect of water-soaking and re-drying is more in pure polyester than NPNCs.…”

Section: Wear Property 331 Mass Lossmentioning

confidence: 99%

Water Soaking and Re-Drying Effect on Mechanical and Wear Properties of Nanoclay-Polyester Nanocomposites

et al. 2022

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This research aims to investigate the influence of water soaking and re-drying on the mechanical and wear properties of nanoclay-polyester nanocomposites (NPNCs). The nanoclay addition significantly enhances the mechanical properties of NPNCs in as-made, water-soaked and re-dried conditions. Also, the addition of nanoclay decreased the percentage of reduction in mechanical properties under water-soaking condition. Re-drying recovers more than 90% in values of mechanical properties compared to original values. In contrast, the addition of nanoclay reduces the mass loss (wear test) of specimens in all three conditions. Re-dried specimens have lesser mass loss than water-soaked specimens and greater mass loss than as-made specimens. SEM images illustrate that the absorbed water can alter the fracture and worn-out surface by swelling and plasticization. Also, SEM images reveal that re-drying can reverse the effect of swelling and plasticization of the specimens.

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Effects of Thermal Shocks and Thermal Spikes on Hygrothermal Behavior of Glass—Polyester Composites

Cited by 9 publications

References 18 publications

Accelerated Weathering and Water Absorption Behavior of Kenaf Fiber Reinforced Acrylic Based Polyester Composites

Accelerated Weathering and Water Absorption Behavior of Kenaf Fiber Reinforced Acrylic Based Polyester Composites

Influence of moisture absorption on the flexural properties of composites made of epoxy resin reinforced with low-content iron particles

Water Soaking and Re-Drying Effect on Mechanical and Wear Properties of Nanoclay-Polyester Nanocomposites

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