The Gradient of Dynamic Mechanical Characteristics across the Thickness of Epoxy Polymers during Environmental Exposure

Startsev, V.O.; Лебедев, М. П.; Molokov, M. V.; Nizin, D. R.

doi:10.1134/s1995421219040154

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Instead, it is proposed to use the minimum point of the temperature derivative of the storage modulus ( dE' / dT ) curve, based on the physical meaning that this point represents, that is, the maximum rate of the α‐transition 47 . Moreover, Startsev completes the T g analysis by plotting and checking the E' and E" curves 35,47–49 …”

Section: Resultsmentioning

confidence: 99%

“…47 Moreover, Startsev completes the T g analysis by plotting and checking the E' and E" curves. 35,[47][48][49] In this article, the plasticization effects generated by Type I hydrogen bonds have been analyzed by determining the variation in the T g values between dry and aged specimens. For this, the method proposed by Startsev et al 30 for stablishing T g has been employed and, at the same time, the suitability of this method for C-SMC materials has been validated.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

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Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Zulueta

Burgoa

Martinez³

2020

J of Applied Polymer Sci

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Carbon fiber sheet molding compounds (C-SMCs) are discontinuous fiber reinforced composite materials. Among them, epoxy-based C-SMCs are becoming relevant materials due to their high thermomechanical performance and better formability than continuous fiber reinforced composites. The thermomechanical performance of epoxy resins and epoxy based continuous carbon fiber composites have shown to be influenced by hygrothermal aging. In this work, this influence is studied for an epoxy-based C-SMC. Epoxy-based C-SMC samples were hygrothermally aged by means of accelerated conditioning, exposing them to 65% relative humidity, and 80 C in a climatic chamber. The equilibrium moisture content, as well as the moisture diffusion coefficient has been determined. The thermomechanical properties of epoxy C-SMC have been analyzed by dynamic mechanical analysis, tensile, 3-point bending, and short beam tests in dry and aged samples. The results showed that epoxy C-SMC is affected by hygrothermal aging in the cases of moisture intake and its effects on T g value, but interestingly, the hygrothermal aging did not generate any degradation effects in the mechanical response of epoxy C-SMC.

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Section: Resultsmentioning

confidence: 99%

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Zulueta

Burgoa

Martinez³

2020

J of Applied Polymer Sci

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“…To clarify the causes of PCM aging the following effects are usually studied: plasticization of polymer matrices by atmospheric moisture [ 33 , 34 ]; swelling (increase in thickness) of samples when adsorbing moisture [ 35 ]; destruction of polymer matrices affected by solar UV radiation and air oxygen [ 32 , 36 ]; hydrolysis of polymer matrices affected by moisture [ 37 , 38 , 39 ]; recoating of polymer matrixes under the influence of temperature and the plasticizing effect of moisture [ 20 , 39 , 40 ]; misorientation of organic fibers affected by solar UV radiation, thermal and moisture cycling, and mechanical loads [ 39 ]; structural relaxation and shrinkage of the fibers forming the frame of the reinforcing filler [ 20 , 39 , 40 ]; physical aging and structural relaxation of polymer matrices [ 41 , 42 ]. …”

Section: Introductionmentioning

confidence: 99%

Contributing Factors of Uneven Climatic Aging for Polymeric Composite Materials: Methods and Modelling

et al. 2023

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Regarding a wide variety of PCMs, the materials’ strength properties which decrease no more than 20% after 30 years of operation are of special interest. One of the important regularities of the climatic aging of PCMs is the formation of gradients of mechanical parameters across the thickness of the plates. The occurrence of gradients must be taken into account when modeling the strength of PCMs for long periods of operation. At present, there is no scientific basis for the reliable prediction of the physical-mechanical characteristics of PCMs for a long period of operation in the world of science. Nevertheless, “climatic qualification” has been a universally recognized practice of substantiating the safe operation of PCMs for various branches of mechanical engineering. In this review, the influence of solar radiation, temperature, and moisture according to gradients of mechanical parameters across the thickness of the PCMs are analyzed according to the data of dynamic mechanical analysis, linear dilatometry, profilometry, acoustic emission, and other methods. In addition, the mechanisms of uneven climatic PCM aging are revealed. Finally, the problems of theoretical modeling of uneven climatic aging of composites are identified.

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Regularities of aging of polymer and polymer composite materials in the conditions of the Far North

Лебедев

Старцев²

2023

Russ Chem Bull

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The Gradient of Dynamic Mechanical Characteristics across the Thickness of Epoxy Polymers during Environmental Exposure

Cited by 3 publications

References 13 publications

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Contributing Factors of Uneven Climatic Aging for Polymeric Composite Materials: Methods and Modelling

Regularities of aging of polymer and polymer composite materials in the conditions of the Far North

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