Preparation and properties of microfibrillated cellulose with different carboxyethyl content

Chen, Jinghuan; Liu, Jingang; Su, Yanqun; Xu, Ze-Hong; Li, Mei-Can; Ying, Ruifeng; Wu, Jian-Quan

doi:10.1016/j.carbpol.2018.11.024

Cited by 24 publications

(7 citation statements)

References 41 publications

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“…There is a broad application for nanocellulose emulsions prepared by using CNC [ 12 ], MFC [ 40 , 41 , 42 ], BNC [ 43 , 44 ], and CNF [ 45 ]. Recently, the viscosity enhancement in emulsions upon introduction of nanocellulose as Pickering emulsifiers has been of great interest.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test

Cui

Hashmi

et al. 2022

Materials

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The dispersibility of flexible polymer chains present at the emulsion’s interface between the dispersed and continuous phase has obvious effects on rheology and dielectric properties of the whole emulsion. Cellulose nanofiber (CNF)-based Pickering emulsions are good systems to research these properties with respect to their microscopic phase structure, dielectric, and rheological properties by using CNF as a water-dispersible Pickering emulsifier, liquid paraffin as an oil phase, and didodecyldimethylammonium bromide (DDAB) as a cationic auxiliary surfactant. The CNF and DDAB contents were systematically varied while the water-to-paraffin oil ratio was kept constant to discern the influence of the Pickering emulsifiers. Polarized optical microscopic images reveal that the droplets tend to shrink at higher CNF content but grow bigger when increasing the DDAB content, which is proved by fluorescence analysis of the CNF dispersibility with varying DDAB content. The dielectric damping exhibits a minimum, whose value decreases with increasing DDAB and CNF content. Increasing the DDAB content promotes the solubilization of CNF in the aqueous phase, which will increase the overall viscosity and yield points. Similarly, a higher CNF content leads to a higher viscosity and yield point, but at high DDAB contents, the viscosity function exhibits an S-shape at intermediate CNF contents. To evaluate the results further, they were compared with CNF dispersions (without oil phase), which showed a surfactant effect slightly on maximum stress but strongly on yield stress τy, indicating that DDAB can promote the formation of a CNF network rather than the viscosity of the whole system. This paper provides information on how a systematical variation of the composition influences morphology and physico-chemical interactions as detected by broadband dielectric spectroscopy and rheological behavior.

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Section: Introductionmentioning

confidence: 99%

Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test

Cui

Hashmi

et al. 2022

Materials

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“…Hydrogen bonds between cellulose molecules and O-H stretching were indicated by a 3339 cm −1 band. The bands at 2891, 1427 and 1361 cm −1 were assigned to stretching and bending vibrations of CH, while the band at 1605 cm −1 , characteristic of carboxylate ions, confirmed the oxidation of cellulose when using TEMPO [33,43]. The existence of benzene ring mixed with the CH in-plane bending justified the band at 1315 cm −1 , while C-O-C antisymmetric stretching was evidenced in the band at 1161 cm −1 [33,44].…”

Section: Ftirmentioning

confidence: 76%

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

et al. 2020

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Magneto-dielectric composites are interesting advanced materials principally due to their potential applications in electronic fields, such as in microstrip antennas substrates. In this work, we developed superparamagnetic polymer-based films using the biopolymeric matrices chitosan (Ch), cellulose (BC) and collagen (Col). For this proposal, we synthesized superparamagnetic iron oxide nanoparticles (SPIONs) functionalized with polyethyleneimine with a cheap method using sonochemistry. Further, the SPIONs were dispersed into polymer matrices and the composites were evaluated regarding morphology, thermal, dielectric and magnetic properties and their application as microstrip antennas substrates. Microscopically, all tested films presented a uniform dispersion profile, principally due to polyethyleneimine coating. Under an operating frequency (fo) of 4.45 GHz, Ch, BC and Col-based SPION substrates showed moderate dielectric constant (ε′) values in the range of 5.2–8.3, 6.7–8.4 and 5.9–9.1, respectively. Furthermore, the prepared films showed no hysteresis loop, thereby providing evidence of superparamagnetism. The microstrip antennas showed considerable bandwidths (3.37–6.34%) and a return loss lower than −10 dB. Besides, the fo were modulated according to the addition of SPIONs, varying in the range of 4.69–5.55, 4.63–5.18 and 4.93–5.44 GHz, for Ch, BC and Col-based substrates, respectively. Moreover, considering best modulation of ε′ and fo, the Ch-based SPION film showed the most suitable profile as a microstrip antenna substrate.

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“…newly exposed cellulose hydroxyl groups. 31,32 The band at around 2900 cm -1 for all samples is attributed to the aliphatic C-H stretching vibration in methyl (CH 3 ) and methylene (CH 2 ) functional groups. The band at 1460 cm -1 represents the aromatic ring C=C of the phenyl propane group of the lignin.…”

Section: Atr-ftir Spectroscopic Characterizationmentioning

confidence: 98%

Characterization of microcrystalline cellulose extracted from walnut and apricots shells by alkaline treatment

2021

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In this study, microcrystalline cellulose (MCC) was isolated from walnut and apricot shells (WS and AS) as agricultural wastes in order to use it as reinforcement in polymer composites. The microcrystalline cellulose was extracted by alkaline treatment and bleached by peroxide as an environmentally friendly treatment, called walnut cellulose (WC) and apricot cellulose (AC). The chemical composition of the samples was set according to the Technical Association of Pulp and Paper Industry (TAPP). After treatments, the alpha-cellulose content increased by about 23 % for the two used cellulose sources. The structural and morphological properties of the samples were investigated by Fourier transform infrared spectroscopy in the attenuated total reflectance mode (ATR-FTIR), optical microscopy (OM), X-ray diffraction and scanning electron microscopy (SEM). The crystallinity index values evaluated for WC and AC via X-ray diffraction were respectively 86.4 and 80.3 %. The alkaline soluble fractions of walnut (ASW) and apricot (ASA) shells were recovered and characterized by OM and ATR-FTIR spectroscopy. Furthermore, their chemical composition was analyzed. The characterization and the properties of the WC and AC were similar to those of commercial MCC and MCC prepared in literature from wood and some agricultural wastes.

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Preparation and properties of microfibrillated cellulose with different carboxyethyl content

Cited by 24 publications

References 41 publications

Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test

Influence of Cellulose Nanofibers on the Behavior of Pickering Emulsions. Part 1. Microscopy and Startup Flow Test

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

Characterization of microcrystalline cellulose extracted from walnut and apricots shells by alkaline treatment

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