NMR and calorimetric investigation of water in a superabsorbing crosslinked network based on cellulose derivatives

Capitani, Donatella; Mensitieri, Giuseppe; Porro, F.; Proietti, Noemi; Segre, Anna Laura

doi:10.1016/j.polymer.2003.08.007

Cited by 43 publications

(36 citation statements)

References 20 publications

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“…The degree of substitution (DS) of the CMc sample was determined by conductometric back titration in accordance with a previous report. 22 The molecular characteristics of carboxymethylated curdlan are given in Table 1. The obtained CMc sample displays good water solubility, even with its high molecular weight, and because of the remarkable improvement in hydrophilicity, the chemical modified curdlan cannot be dissolved in Me 2 SO, which is a good solvent for the native curdlan.…”

Section: Carboxymethylationmentioning

confidence: 99%

Comparison of curdlan and its carboxymethylated derivative by means of Rheology, DSC, and AFM

Yang

Zhang

Yin

et al. 2006

Carbohydrate Research

161

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Section: Carboxymethylationmentioning

confidence: 99%

Comparison of curdlan and its carboxymethylated derivative by means of Rheology, DSC, and AFM

Yang

Zhang

Yin

et al. 2006

Carbohydrate Research

161

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“…This spectrum proves the molecular structure of CMC. Indeed, there are typical signals of the modified AGU in the range of 60 -105 ppm, as mentioned by Capitani et al 27 and Hunze et al 28 The signals at 178 ppm are assigned to the carbon of the carboxyl group (sodium salt).…”

Section: Extracted Cellulose Characterizationmentioning

confidence: 84%

Experimental study on carboxymethylation of cellulose extracted from Posidonia oceanica

Aguir

Mhenni

2005

J of Applied Polymer Sci

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ABSTRACT:The production of carboxymethylcellulose (CMC) from bleached cellulose pulps obtained from Posidonia oceanica was explored. The optimal reaction conditions were studied for the carboxymethylation of cellulose in organic liquids. The carboxymethylation reaction was carried out with NaOH and monochloroacetic acid (MAC) as the reagent. Different alcohols were compared in terms of the degree of substitution (DS). The highest DS was obtained with n-butanol. For this alcohol, the effects of the temperature, alkali concentration, and MAC concentration were studied. The reaction was also carried out in three consecutive steps. The resulting CMC had a DS of about 2.75. The functionalization of cellulose was checked using FTIR spectroscopy and 13 C-NMR. The X-ray analysis showed that the crystalline structure of cellulose decreased when the DS increased and the structure was totally amorphous in high DS material.

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“…Its degree of substitution ranged from 0.9 to 1.05. For comparison purpose, the degree of substitution (DS) in CMC was determined by conductimetric titration according to Capitani et al [9]. CMC solution was prepared by mixing the CMC with distilled water at the concentration of 3%.…”

Section: Methodsmentioning

confidence: 99%

Comparison of gamma ray and electron beam irradiations on the degradation of carboxymethylcellulose

Choi

Kim

Lee

et al. 2009

Korean J. Chem. Eng.

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Carboxymethylcellulose (CMC) is used for a variety of applications due to its superior properties of high viscosity at a low concentration. In this study, the difference between a gamma ray (GR) irradiation from Co-60 and an electron beam (EB) irradiation with 10 MeV Energy on the viscosity change in CMC solution was compared. At the same irradiation doses, the viscosity of the CMC solution was more severely decreased by GR. Electron spin resonance spectroscopy revealed that the radicals in the CMC were more generated by GR, but there was no difference in the Fourier transform infrared spectra of both irradiated CMC solutions. Also, the degree of substitution in CMC was not changed by both irradiation events. From these results, it can be concluded that EB irradiation could better minimize the decrease in the viscosity of the solution with CMC for the sterilization than GR.

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NMR and calorimetric investigation of water in a superabsorbing crosslinked network based on cellulose derivatives

Cited by 43 publications

References 20 publications

Comparison of curdlan and its carboxymethylated derivative by means of Rheology, DSC, and AFM

Comparison of curdlan and its carboxymethylated derivative by means of Rheology, DSC, and AFM

Experimental study on carboxymethylation of cellulose extracted from Posidonia oceanica

Comparison of gamma ray and electron beam irradiations on the degradation of carboxymethylcellulose

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