Mechanical, thermal, and moisture absorption properties of nano-clay reinforced nano-cellulose biocomposites

Gabr, Mohamed H.; Phong, Nguyen Tien; Abdelkareem, Mohammad Ali; Okubo, Kimihiro; Uzawa, Kiyoshi; Kimpara, Isao; Fujii, Toru

doi:10.1007/s10570-013-9876-8

Cited by 76 publications

(55 citation statements)

References 18 publications

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“…Nanoclays (Bailey et al 2015) are commonly used as an additive in CNF-based composite materials to improve, e.g., their mechanical properties (Gabr et al 2013;Wang et al 2014) or fire retardancy (Liu et al 2011;Wicklein et al 2015), and to tailor the selectivity and flux of membranes (Zheng et al 2014). Notably, it has been shown that CNF-bentonite dispersions display properties suitable for use as drilling fluids (Li et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Steady-shear and viscoelastic properties of cellulose nanofibril–nanoclay dispersions

2017

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We have investigated the steady-shear and viscoelastic properties of composite dispersions of cellulose nanofibrils (CNFs) with medium or high charge density and two different nanoclays, viz. rodlike sepiolite or plate-like bentonite. Aqueous dispersions of CNFs with medium charge density displayed significantly lower steady-state viscosity and storage modulus but higher gelation threshold compared with CNFs with high charge density. Dynamic light scattering (DLS) results showed that the apparent hydrodynamic radius of bentonite particles increased when CNFs were added, implying that CNFs adsorbed onto the amphoteric edges of the plate-like bentonite particles. The sepiolite network in CNF-sepiolite dispersions was relatively unaffected by addition of small amounts of CNFs, and DLS showed that the hydrodynamic radius of sepiolite did not change when CNFs were added. Addition of CNFs at concentrations above the gelation threshold resulted in drastic decrease of the steady-shear viscosity of the sepiolite dispersion, suggesting that the sepiolite network disintegrates and the rod-like clay particles are aligned also at low shear rate. The relative change in the rheological properties of the clay-based dispersions was always greater on addition of CNFs with high compared with medium charge density. This study provides insight into how the rheology of CNFnanoclay dispersions depends on both the nanoclay morphology and the interactions between the nanoclay and nanocellulose particles, being of relevance to processing of nanocellulose-clay composites.

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Section: Introductionmentioning

confidence: 99%

Steady-shear and viscoelastic properties of cellulose nanofibril–nanoclay dispersions

2017

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“…The process provides an effective way to increase physical and mechanical performance of polymers (Miao and Hamad 2013;Siro and Plackett 2010). Typical reinforcing agents, including nanoclays (Gabr et al 2013;Plackett 2012), carbon nanofibers (Huang et al 2014), carbon nanotubes , reduced graphene oxide (Vallés et al 2013), silica nanoparticles (Song and Zheng 2013;Zhang et al 2013), have been widely studied. However, one drawback of these nanofillers is their nonrenewable nature, which leads to increased pressure to the global environment and energy resources.…”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride)/cellulose nanocrystals composites: rheological, hydrophilicity, thermal and mechanical properties

Zhang

Song

et al. 2015

Cellulose

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Cellulose nanocrystals (CNCs) were used to improve the performance of poly(vinylidene fluoride) (PVDF), and the composite properties were characterized. The results showed that the prepared nanocomposites displayed the increases in mechanical properties. In particular, with the incorporation of 6 wt% CNCs, increases in tensile strength and dynamic storage modulus were observed. For hydrophilicity, the water contact angle decreased from 90°to 77°with the incorporation of only 3 wt% CNCs, indicating improved hydrophilicity. Addition of CNCs to PVDF also helped improve its thermal stability and crystallinity. It was suggested that CNCs played a nucleating role in the crystallization of PVDF, which was supported by the smaller size of PVDF spherulite observed from scanning electron microscopy analysis. Rheological results indicated that incorporation of CNCs also increased both melt storage modulus and shear viscosity of composites. Overall, our present work demonstrates that CNCs can provide PVDF with simultaneously improved properties.

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“…The storage modulus of nanocomposites for dry samples is shown in Figure 4(a). The increase of storage modulus during glass transition temperature can be associated with the decrease in polymeric chain mobility [34] and enhancement of stiffness [35]. In case of 0.1 wt% HNT and 0.1 wt% MLG show significant improvement of storage modulus particularly at lower temperature.…”

Section: Resultsmentioning

confidence: 97%

Effect of Short Term Water Exposure on the Mechanical Properties of Halloysite Nanotubes-Multi Layer Graphene Reinforced Polyester Nanocomposites

Saharudin¹,

Atif²

2017

Preprint

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Abstract:The influence of short term water absorption on the mechanical properties of halloysite nanotubes-multi layer graphene reinforced polyester hybrid nanocomposites has been investigated. The addition of nano-fillers significantly increased the flexural strength; tensile strength and impact strength in dry and wet conditions. After short term water exposure; the maximum microhardness; tensile; flexural and impact toughness values were observed at 0.1 wt% MLG. The microhardness increased up to 50.3%; tensile strength increased up to 40% and flexural strength increased up to 44%. Compared to dry samples; the fracture toughness and surface roughness of all types of produced nanocomposites were increased that may be attributed to plasticization effect. Scanning electron microscopy revealed that the main failure mechanism is caused by the weakening of nanofiller-matrix interface induced by water absorption. It was further observed that synergistic effects were not effective at concentration of 0.1 wt% to produce considerable improvement in mechanical properties of produced hybrid nanocomposites.

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Mechanical, thermal, and moisture absorption properties of nano-clay reinforced nano-cellulose biocomposites

Cited by 76 publications

References 18 publications

Steady-shear and viscoelastic properties of cellulose nanofibril–nanoclay dispersions

Steady-shear and viscoelastic properties of cellulose nanofibril–nanoclay dispersions

Poly(vinylidene fluoride)/cellulose nanocrystals composites: rheological, hydrophilicity, thermal and mechanical properties

Effect of Short Term Water Exposure on the Mechanical Properties of Halloysite Nanotubes-Multi Layer Graphene Reinforced Polyester Nanocomposites

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