Chemical modification of cotton cellulose in supercritical carbon dioxide: Synthesis and characterization of cellulose carbamate

Yin, Cui‐Cui; Li, Jianbo; Xu, Qun; Peng, Qi; Liu, Yabei; Shen, Xinyuan

doi:10.1016/j.carbpol.2006.05.010

Cited by 137 publications

(50 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The filtrate was evaporated at reduced pressure and the residue was purified by flash chromatography on silica gel (33% ethyl acetate in hexane, r.f=0.5) to give a white solid (111mg, 90% yield). 1 …”

Section: Preparation Of 6-((6-bromohexyl)oxy)coumarinmentioning

confidence: 99%

“…By virtue of its non-toxicity, biocompatibility and degradability cellulose has broad applications in the food, pharmaceutical and chemical industries. However, economically feasible and environmentally friendly chemical processes are required for more efficient utilization of cellulose [1]. Therefore, numerous efforts are underway seeking new ways to expand the application range of cellulose while retaining its prominent properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photoresponsive Cellulose Nanocrystals

Filpponen

Sadeghifar

Argyropoulos

2011

Nanomaterials and Nanotechnology

View full text Add to dashboard Cite

In this communication a method for the creation of fluorescent cellulose nanoparticles using click chemistry and subsequent photodimerization of the installed sidechains is demonstrated. In the first step, the primary hydroxyl groups on the surface of the CNCs were converted to carboxylic acids by using TEMPO-mediated hypohalite oxidation. The alkyne groups, essential for the click reaction, were introduced into the surface of TEMPOoxidized CNCs via carbodiimide-mediated formation of an amide linkage between monomers carrying an amine functionality and carboxylic acid groups on the surface of the TEMPO-oxidized CNCs. Finally, the reaction of surface-modified TEMPO-oxidized cellulose nanocrystals and azido-bearing coumarin and anthracene monomers were carried out by means of a click chemistry, i.e., Copper(I)-catalyzed Azide-Alkyne Cycloaddition (CuAAC) to produce highly photo-responsive and fluorescent cellulose nanoparticles. Most significantly, the installed coumarin and/or anthracene side-chains were shown to undergo UV-induced [2+2] and [4+4] cycloaddition reactions, bringing and locking the cellulose nanocrystals together. This effort paves the way towards creating, cellulosic photo responsive nano-arrays with the potential of photo reversibility since these reactions are known to be reversible at varying wavelengths.

show abstract

Section: Preparation Of 6-((6-bromohexyl)oxy)coumarinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoresponsive Cellulose Nanocrystals

Filpponen

Sadeghifar

Argyropoulos

2011

Nanomaterials and Nanotechnology

View full text Add to dashboard Cite

show abstract

“…The two main product that are derived from the cotton plant is cotton fiber and cottonseed [2][3][4]. The main component of cotton is cellulose that is the most abundant natural polymer on Earth [5]. It is the renewable biopolymer of outstanding properties and variety of useful applications [5].…”

Section: Introductionmentioning

confidence: 99%

“…The main component of cotton is cellulose that is the most abundant natural polymer on Earth [5]. It is the renewable biopolymer of outstanding properties and variety of useful applications [5]. Cotton is mainly used as a material for the manufacture of textile fabrics such as towel, robes, jeans, shirts, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Many research groups in past few decades have devoted significant attention on modification of cotton for various applications. Yin et al reported the chemical modification of cellulose carbamate using supercritical carbon dioxide and reported that this method has remarkably increased the nitrogen content in the modified polymer [5]. Recently, cotton fabrics were chemically modified with polyamidoamine dendrimer to yield antimicrobial and efficient polymer materials for ink jet printing [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectral and Thermal Properties of Biofield Energy Treated Cotton

Trivedi¹,

Tallapragada²,

Branton³

et al. 2015

AJEE

View full text Add to dashboard Cite

Abstract:Cotton has widespread applications in textile industries due its interesting physicochemical properties. The objective of this study was to investigate the influence of biofield energy treatment on the spectral, and thermal properties of the cotton. The study was executed in two groups namely control and treated. The control group persisted as untreated, and the treated group received Mr. Trivedi's biofield energy treatment. The control and treated cotton were characterized by different analytical techniques such as differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), fourier transform infrared (FT-IR) spectroscopy, and CHNSO analysis. DSC analysis showed a substantial increase in exothermic temperature peak of the treated cotton (450 ºC) as compared to the control sample (382ºC). Additionally, the enthalpy of fusion (∆H) was significantly increased by 86.47% in treated cotton. The differential thermal analysis (DTA) analysis showed an increase in thermal decomposition temperature of treated cotton (361ºC) as compared to the control sample (358ºC). The result indicated the increase in thermal stability of the treated cotton in comparison with the control. FT-IR analysis showed an alterations in -OH stretching (3408→3430 cm -1 ), carbonyl stretching peak (1713-1662 cm -1 ), C-H bending (1460-1431 cm -1 ), -OH bending (580-529 cm -1 ) and -OH out of plane bending (580-529 cm -1 ) of treated cotton with respect to the control sample. CHNSO elemental analysis showed a substantial increase in the nitrogen percentage by 19.16% and 2.27% increase in oxygen in treated cotton as compared to the control. Overall, the result showed significant changes in spectral and thermal properties of biofield energy treated cotton. It is assumed that biofield energy treated cotton might be interesting for textile applications.

show abstract

Application of the Solvent Dimethyl Sulfoxide/Tetrabutyl‐Ammonium Acetate as Reaction Medium for Mix‐Acylation of Pulp

Jiang

Miao

et al. 2016

Adv Polym Technol

View full text Add to dashboard Cite

An important cellulose mixed ester, cellulose acetate butyrate (CAB), was successfully prepared in tetrabutylammonium acetate (TBAA)/dimethyl sulfoxide (DMSO) system. The structure of the cellulose derivative was characterized with a Fourier Transform IR spectrometer and analyzed using 13 C cross-polarization magic angle spinning nuclear magnetic resonance. The degree of substitution (DS) of the samples prepared was calculated according to 1 H-NMR analysis. And the solubility of CAB was investigated in a wide range of traditional organic solvents such as 2-methyl-ethyl ketone, dichloromethane and ethyl acetate. The thermal properties of the product were analyzed by TGA analysis. The surface morphology of the esters was characterized with a field emission-scanning electron microscopy (FE-SEM). The relationship among surface morphology, solubility, and DS of the cellulose mixed ester was discussed. Moreover, TBAA and DMSO were recovered by vacuum distillation, which was characterized by Fourier transform infrared spectroscopy.

show abstract

Chemical modification of cotton cellulose in supercritical carbon dioxide: Synthesis and characterization of cellulose carbamate

Cited by 137 publications

References 17 publications

Photoresponsive Cellulose Nanocrystals

Photoresponsive Cellulose Nanocrystals

Spectral and Thermal Properties of Biofield Energy Treated Cotton

Application of the Solvent Dimethyl Sulfoxide/Tetrabutyl‐Ammonium Acetate as Reaction Medium for Mix‐Acylation of Pulp

Contact Info

Product

Resources

About