Mechanical properties of 3-glycidoxypropyltrimethoxysilane functionalized multi-walled carbon nanotubes/epoxy composites cured by electron beam irradiation
Abstract:Electron beam (EB) curing is a high rate manufacturing technique for preparing of the epoxy composites. In this study, EB radiation was used to prepare carbon nanotubes (CNTs)/epoxy composites and the effects of 3-glycidoxypropyltrimethoxysilane (GPTMS) functionalized multi-walled carbon nanotubes (MWNTs) on the mechanical properties of EB cured MWNTs/epoxy composites were studied given the important effects on the composites performance of interfacial adhesion between the CNTs and epoxy. The results showed th… Show more
“…46 This behavior is in line with that reported by Lu et al. 47 Figure 6.A visual observation of dispersion stability of (a) COOH-MWCNTS and (b) 3-GPTMS/MWCNTs in epoxy resin after 15 days.…”
Section: Resultssupporting
confidence: 90%
“…The stability of colloidal dispersions, however, depended largely on the surface chemistry of the dispersed-phase particles in the colloid. 46 This behavior is in line with that reported by Lu et al 47…”
Section: Characterization Of the Functionalized Mwcnts Refsupporting
This study represents the effects of multi-walled carbon nanotubes at various contents with respect to the matrix (0-0.5 wt% at a step of 0.1 wt%) on the mechanical responses of unidirectional basalt fiber/epoxy composites. Toward this end, multi-walled carbon nanotubes were firstly functionalized with 3-glycidoxypropyltrimethoxysilane to improve their dispersion state and interfacial compatibility with the epoxy. Subsequently, unidirectional basalt fiber/epoxy and multiscale 3-glycidoxypropyltrimethoxysilane-multi-walled carbon nanotubes/unidirectional basalt fiber/epoxy composites were prepared. The mechanical properties of the composites were determined by tensile, flexural, and quasi-static compression tests. The compressive strength of the composites was obtained through performing the compression test on the off-axis specimens and extracting their longitudinal compressive strength. Results demonstrated that the highest values in tensile strength, flexural strength, and compressive strength were attained at 0.4 wt% multi-walled carbon nanotubes with 12%, 38%, 41% increase, respectively, compared to the basalt fiber/epoxy composite. Potential mechanisms behind these were implied. Furthermore, compressive modulus and strength of the specimens were obtained theoretically using an Euler-Bernoulli beam-based approach. Knowing the flexural strength as well as the tensile and flexural moduli from the experimental testing, compressive modulus and strength were obtained and the results were compared to those obtained experimentally. The theoretical and experimental results confirmed that there was a good agreement between them.
“…46 This behavior is in line with that reported by Lu et al. 47 Figure 6.A visual observation of dispersion stability of (a) COOH-MWCNTS and (b) 3-GPTMS/MWCNTs in epoxy resin after 15 days.…”
Section: Resultssupporting
confidence: 90%
“…The stability of colloidal dispersions, however, depended largely on the surface chemistry of the dispersed-phase particles in the colloid. 46 This behavior is in line with that reported by Lu et al 47…”
Section: Characterization Of the Functionalized Mwcnts Refsupporting
This study represents the effects of multi-walled carbon nanotubes at various contents with respect to the matrix (0-0.5 wt% at a step of 0.1 wt%) on the mechanical responses of unidirectional basalt fiber/epoxy composites. Toward this end, multi-walled carbon nanotubes were firstly functionalized with 3-glycidoxypropyltrimethoxysilane to improve their dispersion state and interfacial compatibility with the epoxy. Subsequently, unidirectional basalt fiber/epoxy and multiscale 3-glycidoxypropyltrimethoxysilane-multi-walled carbon nanotubes/unidirectional basalt fiber/epoxy composites were prepared. The mechanical properties of the composites were determined by tensile, flexural, and quasi-static compression tests. The compressive strength of the composites was obtained through performing the compression test on the off-axis specimens and extracting their longitudinal compressive strength. Results demonstrated that the highest values in tensile strength, flexural strength, and compressive strength were attained at 0.4 wt% multi-walled carbon nanotubes with 12%, 38%, 41% increase, respectively, compared to the basalt fiber/epoxy composite. Potential mechanisms behind these were implied. Furthermore, compressive modulus and strength of the specimens were obtained theoretically using an Euler-Bernoulli beam-based approach. Knowing the flexural strength as well as the tensile and flexural moduli from the experimental testing, compressive modulus and strength were obtained and the results were compared to those obtained experimentally. The theoretical and experimental results confirmed that there was a good agreement between them.
“…Wang et al 13 suggested that the addition of CNT in phenolic resin enhances its high temperature ablation resistance. Lu et al 14 reported enhanced glass transition temperature and mechanical strength on addition of 0.25 wt% of 3-glycidoxypropyltrimethoxysilane functionalized multiwalled carbon nanotubes. Further, few studies suggested the cryogenic property enhancement on adding CNTs and other carbonaceous nanofillers to polymer resin.…”
The objective of the present investigation is to study the alteration in flexural performance of glass/epoxy (GE) composite with and without multiwalled carbon nanotube (MWCNT) after liquid nitrogen conditioning. The epoxy resin was first modified by 0.1, 0.3, and 0.5 wt% MWCNT, which was then used along with E-glass fibers to fabricate laminates. Flexural strength and modulus were evaluated by 3-point bend test. Out of these four compositions, the maximum strength in the as-fabricated condition was obtained for GE composite with 0.1 wt% CNT, which is 32.74% higher as compared to GE composite. Decrease in strength and modulus was observed for short time span of liquid nitrogen conditioning i.e. 0.25 h. Long cryogenic conditioning resulted in increment in strength. To understand the failure mechanisms, post failure analysis was carried out using scanning electron microscope. The design parameters are calculated using Weibull distribution model.
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