Spectroscopic and thermal analyses for the effect of acetic acid on the plasticized sodium carboxymethyl cellulose

Badry, Rania; Ezzat, Hend A.; El‐Khodary, Sherif A.; Morsy, Mohamed; Elhaes, Hanan; Nada, Nadra; Ibrahim, Medhat

doi:10.1016/j.molstruc.2020.129013

Cited by 39 publications

(17 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two pyrolysis peaks were noted in the resulting TG curves ( Figure 10 , Figure 11 , Figure 12 and Figure 13 ), supporting previous studies [ 25 ]. The first peak occurred near 100 °C, reflecting the removal of residual moisture.…”

Section: Resultssupporting

confidence: 89%

“…These results indicated that the extraction process successfully removed the polymers, leaving a pure cellulose residue for CMC production. Two peaks at 1592 cm −1 and 1421 cm −1 corresponding to COO — stretching of the carboxylic group and O-H stretching of CMC, respectively, were found in CMC for all five materials, indicating that the materials were successfully reacted ( Figure 8 ) [ 5 , 25 ]. These same peaks were also detected in spectra from the CMC composite films, suggesting that reactions did not alter the hydroxyl interactions.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Raw Material Source on the Properties of CMC Composite Films

Yao

Sun

et al. 2021

Polymers

View full text Add to dashboard Cite

Sodium carboxymethyl cellulose (CMC) can be derived from a variety of cellulosic materials and is widely used in petroleum mining, construction, paper making, and packaging. CMCs can be derived from many sources with the final properties reflecting the characteristics of the original lignocellulosic matrix as well as the subsequent separation steps that affect the degree of carboxy methyl substitution on the cellulose hydroxyls. While a large percentage of CMCs is derived from wood pulp, many other plant sources may produce more attractive properties for specific applications. The effects of five plant sources on the resulting properties of CMC and CMC/sodium alginate/glycerol composite films were studied. The degree of substitution and resulting tensile strength in leaf-derived CMC was from 0.87 to 0.89 and from 15.81 to 16.35 MPa, respectively, while the degree of substitution and resulting tensile strength in wooden materials-derived CMC were from 1.08 to 1.17 and from 26.08 to 28.97 MPa, respectively. Thus, the degree of substitution and resulting tensile strength tended to be 20% lower in leaf-derived CMCs compared to those prepared from wood or bamboo. Microstructures of bamboo cellulose, bamboo CMC powder, and bamboo leaf CMC composites’ films all differed from pine-derived material, but plant source had no noticeable effect on the X-ray diffraction characteristics, Fourier transform infrared spectroscopy spectra, or pyrolysis properties of CMC or composites films. The results highlighted the potential for using plant source as a tool for varying CMC properties for specific applications.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Effects of Raw Material Source on the Properties of CMC Composite Films

Yao

Sun

et al. 2021

Polymers

View full text Add to dashboard Cite

show abstract

“…The present findings indicated that molecular modelling is an important tool for elucidating several parameters to fulfil the experimental findings. This is in good agreement with those obtained previously [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40].…”

Section: Discussionsupporting

confidence: 93%

ICMMS-2: Metal−organic Frameworks for Hydrogen Storage: Theoretical Prospective

et al. 2021

View full text Add to dashboard Cite

The adsorption of H2 in dehydrated and hydrated Materials of Institute Lavoisier (MIL-101) was investigated theoretically. The effect of terminal water molecules on adsorption as one of the more vital MIL-n trivalent chromium-based porous carboxylates in metal-organic frameworks application in the renewable energy field was also theoretically studied. The MIL-101 structures were optimized for geometry and energy minimization was performed. The calculations were carried out using density functional theory approach with B3LYP functional and mixed basis set of Lanl2DZ and 6-31G(d, p) for Cr and light atoms (C, H, O, F), respectively, as implemented in the Gaussian 09 program package. The spin and atomic charges distribution on the Cr metal atoms, adsorbate, and water molecules are calculated using natural bond orbital (NBO). The density of states (DOS) for the clusters was obtained using Gaussian smearing of Kohn-Sham orbital energies. The natural bond orbital (NBO) for molecular orbital analysis and atomic charge calculations were utilized. For the dehydrated MIL-101, more adsorbate molecules were found near the exposed Cr2 sites than the fluorine saturated Cr1 sites. Furthermore, terminal water molecules in the hydrated MIL-101 made more interaction sites and enhanced adsorption.

show abstract

“…The final residual weights of the films were 28, 32, 35, and 22 wt%, respectively. The addition of plant fibers resulted in an increase in the required decomposition temperature and an increase in the final weight residue ( Figure 5 ) [ 4 , 46 ].…”

Section: Resultsmentioning

confidence: 99%

Chemical and Enzymatic Fiber Modification to Enhance the Mechanical Properties of CMC Composite Films

Tang

Sun

et al. 2022

Polymers

View full text Add to dashboard Cite

Carboxymethyl cellulose (CMC) is a cellulose derivative that can be obtained from wood, bamboo, rattan, straw, and other cellulosic materials. CMC can be used to produce biofilms for many purposes, but the properties of these resulting films make them unsuitable for some applications. The effects of three kinds of plant fiber addition on CMC film properties was investigated using CMC derived from eucalyptus bark cellulose. Tensile strength (TS) and elongation at break (EB) of CMC/sodium alginate/glycerol composite films were 26.2 MPa and 7.35%, respectively. Tensile strength of CMC composite films substantially increased, reaching an optimum at 0.50 g of fiber. The enhancement due to industrial hemp hurd fiber on CMC composite films was more obvious. Pretreatment with hydrogen peroxide (H2O2) and glacial acetic acid (CH3COOH) produced films with a TS of 35.9 MPa and an EB of 1.61%. TS values with pectinase pretreated fiber films was 41.3 MPa and EB was 1.76%. TS of films pretreated with pectinase and hemicellulase was 45.2 MPa and EB was 4.18%. Chemical and enzymatic treatment both improved fiber crystallinity, but film tensile strength was improved to a greater extent by enzymatic treatment. Surface roughness and pyrolysis residue of the film increased after fiber addition, but Fourier transform infrared spectroscopy (FTIR), opacity, and water vapor transmission coefficients were largely unchanged. Adding fiber improved tensile strength of CMC/sodium alginate/glycerol composite films and broadened the application range of CMC composite films without adversely affecting film performance.

show abstract

Spectroscopic and thermal analyses for the effect of acetic acid on the plasticized sodium carboxymethyl cellulose

Cited by 39 publications

References 38 publications

Effects of Raw Material Source on the Properties of CMC Composite Films

Effects of Raw Material Source on the Properties of CMC Composite Films

ICMMS-2: Metal−organic Frameworks for Hydrogen Storage: Theoretical Prospective

Chemical and Enzymatic Fiber Modification to Enhance the Mechanical Properties of CMC Composite Films

Contact Info

Product

Resources

About