Synthesis and characterization of cationically modified nanocrystalline cellulose

Zaman, Masuduz; Xiao, Huining; Chibante, L. P. F.; Ni, Yonghao

doi:10.1016/j.carbpol.2012.02.066

Cited by 235 publications

(161 citation statements)

References 39 publications

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“…FTIR: prominent bands at 1440 and 1483 cm -3 were attributed to the CH 2 bending mode and methyl groups of the cationic cellulose substituents in accordance with data published by Zaman et al (2012) 13 C solid-state NMR: signals between 66 and 105 ppm referred to the anhydroglucose, while a signal at 175 ppm appeared upon oxidation, due to the carboxylic acid group (Saito et al 2005) and a signal at 56 ppm due to the methyl groups on the quaternary ammonium was detected in the cationic cellulose sample (Chaker and Boufi 2015) (Figs. S1, S2, Supplementary information).…”

Section: Anionic-cellulosesupporting

confidence: 88%

“…Following the semi dry procedure described by Zaman et al (2012). 5 wt% NaOH (relative to corrected film mass) dissolved in 5 mL of DI water, was added to the cellulose films contained in polyethylene bags.…”

Section: Cationic-cellulosementioning

confidence: 99%

“…where C is the concentration of NaOH solution (M), V is the volume of NaOH solution (in dm 3 ), w is the weight of the dried anionic cellulose sample (g), 162.15 is the M w of the AGU and 35.97 is the difference in M w of AGU and sodium salt of the glucoronic acid group (Zaman et al 2012). Triplicate samples were analysed for each material and an average reported.…”

Section: Anionic-cellulosementioning

confidence: 99%

“…To introduce a positive charge the epoxide, glycidyltrimethylammonium chloride (GTMAC), was grafted onto cellulose through the nucleophilic addition to the alkali-activated cellulose hydroxyl groups (Zaman et al 2012). The radical 2,2,6,6-tetramethylpipiridine 1-oxyl (TEMPO) was used to mediate the oxidation of the primary alcohols to introduce a negative charge (Isogai et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Surface modified cellulose scaffolds for tissue engineering

et al. 2016

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We report the ability of cellulose to support cells without the use of matrix ligands on the surface of the material, thus creating a two-component system for tissue engineering of cells and materials. Sheets of bacterial cellulose, grown from a culture medium containing Acetobacter organism were chemically modified with glycidyltrimethylammonium chloride or by oxidation with sodium hypochlorite in the presence of sodium bromide and 2,2,6,6-tetramethylpipiridine 1-oxyl radical to introduce a positive, or negative, charge, respectively. This modification process did not degrade the mechanical properties of the bulk material, but grafting of a positively charged moiety to the cellulose surface (cationic cellulose) increased cell attachment by 70% compared to unmodified cellulose, while negatively charged, oxidised cellulose films (anionic cellulose), showed low levels of cell attachment comparable to those seen for unmodified cellulose. Only a minimal level of cationic surface derivitisation (ca 3% degree of substitution) was required for increased cell attachment and no mediating proteins were required. Cell adhesion studies exhibited the same trends as the attachment studies, while the mean cell area and aspect ratio was highest on the cationic surfaces. Overall, we demonstrated the utility of positively charged bacterial cellulose in tissue engineering in the absence of proteins for cell attachment.

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Section: Anionic-cellulosesupporting

confidence: 88%

Section: Cationic-cellulosementioning

confidence: 99%

Section: Anionic-cellulosementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface modified cellulose scaffolds for tissue engineering

et al. 2016

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“…The addition of microcrystalline cellulose nanofibers into linear segmented polyurethanes (SPU) resulted in an increase in the Young's modulus and a decrease in the deformation at the break (Auad et al 2010). Recently, nanocrystalline cellulose (NCC) has been extensively studied because it exhibits many unique characteristics, such as high tensile strength and Young's modulus, polar groups (-OH), an enriched surface (Eyley and Thielemans 2011), and a high specific surface area (Cranston and Gray 2006;Zaman et al 2012) in addition to its biodegradable and environmentally benign nature (Wegner and Jones 2006).The thermal stability, rigidity, and hardness of the resulting composite materials were improved due to the addition of NCC (Petersson et al 2007;Noorani et al 2007;Habibi et al 2010). The effects of the modified NCC (modified by APTES and MPS, respectively) on the HCHO emission and bonding strength of urea-formaldehyde (UF) resin adhesive were studied.…”

mentioning

confidence: 99%

Preparation and Characterization of Waterborne Polyurethane Modified by Nanocrystalline Cellulose

et al. 2013

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Nanocrystalline cellulose (NCC) was used as a modifier for waterborne polyurethane (WPU) to investigate the water and ethanol resistance of WPU-NCC composites. The NCC surface was modified with γ-glycidoxypropyltrimethoxysilane (GPTMS) and γ-ammnonimpropylmethyldimethoxysilane (APMDS) to improve its compatibility with waterborne polyurethane (WPU), as indicated by the contact angle (CA). The characteristic properties of WPU modified by NCC and a control group were compared by a Fourier-transform infrared spectroscope (FTIR), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). The CA between the modified NCC and WPU was decreased by 31.2% (with 8.0% APMDS (v/v)), and the NCC modified by GPTMS resulted in a 33.8% decrease of the CA. Compared to the original WPU, the crystal structure and crystallinity of the modified WPU showed a slight alteration. The SEM micrographs showed that the NCC particles modified by GPTMS were dispersed more uniformly. The FT-IR results showed that the addition of modified NCC led to the reduction of the characteristic absorption peak of the hydroxyl group. The water resistance of WPU with 1.5% NCC modified by GPTMS was increased by 47.2%, and the ethanol resistance decreased by 67.0%, while the modification from APMDS led to a 38.1% increase in water resistance and a 56.9% decrease in ethanol resistance. Science and Technology, Beijing Forestry University, Haidian District, Beijing 100083, PR China;*Corresponding author: pujunwen@126.com Keywords INTRODUCTIONWaterborne polyurethane (WPU) has become used to a remarkable degree as a replacement for the ordinary solvent-based polyurethane, a change that has been motivated by its environment-friendly, nontoxic, and nonflammable nature (Wegner and Jones 2006;Du et al. 2008;Kim et al. 2010). WPU is considered to be an organic material with a wide potential of applications in many fields, such as coatings, adhesives, leathers, and the textile industry (Kim and Lee 1996;Madbouly and Otaigbe 2005;Cao et al. 2007). However, the waterborne polyurethanes are inferior to the solvent-based polyurethane with respect to their low chemical resistance, scratch resistance, weather resistance, mechanical strength, and gloss (Rahman and Lee 2009;Zhang et al. 2010). Due to the hydrophilic groups from the molecular chain of WPU, the dried film of WPU shows obvious hygroscopic properties, which lead to poor water resistance, low mechanical properties, and strength decreases. (Rahman and Kim 2007;Sun et al. 2011) Much attention has been given to overcoming these shortcomings and realizing the larger-scale application of WPU by the incorporation of organic and inorganic materials 2595 Zhang et al. 2010). The nanosilica was added into the aqueous emulsion of polyurethane (PU) in order to improve its water and thermal resistance. The improvement could be attributed to a thermal insulation effect of nanosilica, as well as an increase of the mean free path of water molecules that pass through the matrix of the PU-nanosilica composite (Kim e...

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Nanocrystalline Cellulose: Green, Multifunctional and Sustainable Nanomaterials

Julkapli

Mansouri

2017

Handbook of Composites From Renewable Materials

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Synthesis and characterization of cationically modified nanocrystalline cellulose

Cited by 235 publications

References 39 publications

Surface modified cellulose scaffolds for tissue engineering

Surface modified cellulose scaffolds for tissue engineering

Preparation and Characterization of Waterborne Polyurethane Modified by Nanocrystalline Cellulose

Nanocrystalline Cellulose: Green, Multifunctional and Sustainable Nanomaterials

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