High performance multiscale glass fibre epoxy composites integrated with cellulose nanocrystals for advanced structural applications

Abstract

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Role of cellulose nanocrystals in epoxy-based nanocomposites: mechanical properties, morphology and thermal behavior

“…Figures 11c-h show the SEM micrographs of the nanocomposites with 4.0, 5.5 and 7.0% CNCs. The incorporation of CNCs caused the roughness in the nanocomposite fractures observed in Figures 11c, e, and g. In the images, the black arrows show that the CNCs increase the roughness, similar to what was observed by Kumar et al [40] . Based on the images and on the mechanical properties, we can state that, during the deformation, the CNCs reinforced the system and increased the elastic modulus, but accelerated the fracture by acting as point defects.…”

“…Table 3 also shows that the nanocomposites' tensile modulus and flexural modulus values were higher than that of the neat epoxy. This behavior indicates that the high surface area of the CNCs and the presence of O-H groups in their surface caused, at a certain level, good interaction of the CNCs with the epoxy resin molecules [17] , and includes possible chemical bonding between the CNCs and the epoxy matrix [40] . The values of elongation and tensile and flexural strengths have a tendency to reduction with the increase in the CNC concentration.…”

“…The lack of a better reinforcing effect could be explained by the hydrophilic nature of CNCs [40] , which causes them to Em (GPa) 50 [55] 1.70 have a poor interaction with the epoxy matrix [33,42] . Besides the lack of dispersion, the presence of water in the structure of the epoxy matrix can greatly affect the mechanical properties of nanocomposites [48] .…”

The valorization of municipal grass waste for the extraction of cellulose nanocrystals

“…5 Cellulose nanomaterials that are extracted from lignocellulosic biomass can be classied into two main subcategories: (i) cellulose nanobers (CNFs), which are elongated brils comprising both amorphous and crystalline regions, 6 and (ii) cellulose nanocrystals (CNCs), which are highly crystalline nanoparticles of cellulose prepared via strong acid hydrolysis. 7,8 CNCs or sometimes referred as cellulose nanowhiskers commonly have length of several hundred nanometers and diameters ranging from 1 to 50 nm, 9 which makes them compatible in developing nanocomposites and highperformance composites [10][11][12] due to their high crystallinity and high surface area. Besides, the intriguing and engineered properties of CNCs makes it an ideal material to be considered in niche elds of applications including but not limited to biomedical, 13 food packaging, 14 reinforcing llers, 15 membranes, 16 optical 17 and environmental.…”

ÇCKNT Katkılı ve Katkısız CETP Kompozit Malzemelerin TIN Kaplamalı Zımba İle Delinmesinde Kesme Kuvveti Değişiminin İncelenmesi

“…Cam elyaf takviyeli polimer (CETP) kompozitler sahip oldukları yüksek özgül mukavemet, uygun korozyon ve yorulma direnci özelliklerinden dolayı günümüzde birçok kullanım alanına sahip malzemeler haline gelmiştir [1][2][3][4]. Bu malzemeler grafen, bor nitrür, çok cidarlı karbon nanotüp (ÇCKNT) gibi katkı malzemeleri kullanılarak katkılandırılmakta ve sahip oldukları özellikler geliştirilmektedir [5][6][7].…”