An investigation in solution acetylation of cellulose by microscopic techniques

Tang, Lie‐Gui; Hon, David N.‐S.; Zhu, Yayun

doi:10.1002/(sici)1097-4628(19970606)64:10<1953::aid-app10>3.3.co;2-x

Cited by 4 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pore diameters of CTA were found to be around 400 to 857 nm. Fortunately, this result for CTA was supported by Tang and Hindi and Abohassan . Additionally, pore diameter of the casted CDA 18 membrane was measured from 457 to 742 nm.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Characterization of Cellulose Derivatives from Industrial Towel Waste

et al. 2019

View full text Add to dashboard Cite

The paper covers the synthesis and characterization of cellulose derivatives from waste cellulose, namely, towel wastes. For this purpose, the cellulose acetate derivatives were synthesized from towel waste by applying the conventional chemical synthesis process. To clarify the structure of synthesized materials, some spectroscopic methods (FT-IR, XRD, 1 H-NMR, 13 C-NMR) were used. Furthermore, thermal behavior and surface morphology of prepared materials were investigated by DTG-TG and SEM, respectively. It was found that the degree of substitution values decreased as the duration of hydrolysis increased in cellulose diacetate synthesis. It was also understood that cellulose diacetate was dissolved in acetone differently from cellulose triacetate. Degree of substitution values of cellulose diacetate were compared by using 1 H-NMR and titrimetric method. These helped elucidate the expected reaction. The proposed method was easy compared with the conventional method.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Additionally, pore diameter of the casted CDA 18 membrane was measured from 457 to 742 nm. Similar dimension for CDA 18 was recorded by Tang who noted that the pore diameter of CDA 18 was more than CTA.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Cellulose Derivatives from Industrial Towel Waste

et al. 2019

View full text Add to dashboard Cite

show abstract

“…[1] Typically, cellulose esters such as cellulose acetates are synthesized industrially via heterogeneous approaches using activated acids (acetic anhydride) in acetic acid as solvent. [7,14] This approach is considered more attractive for the industries compared to homogeneous routes, as it avoids the challenge of solubilizing the cellulose.…”

Section: Esterification and Transesterificationmentioning

confidence: 99%

Critical Review on Sustainable Homogeneous Cellulose Modification: Why Renewability Is Not Enough

Onwukamike

Grelier

Grau

et al. 2018

ACS Sustainable Chem. Eng.

137

108

View full text Add to dashboard Cite

As we mark the 20 th anniversary after the introduction of the twelve principles of green chemistry, sustainable modification of cellulose, being the most abundant biobased polymer, is worth consideration. Many researchers work on this renewable polymer, however the use of non-sustainable solvents, reactants and modification approaches simply shifts the environmental burden to other stages of the life cycle. Therefore, to achieve true sustainable modification of cellulose, its renewability combined with mild and efficient reaction protocols is crucial in order to obtain sustainable materials that will reduce the overall negative effect of the fossil-based resources they are replacing.

show abstract

“…The acetylation reaction is also shown to be slow, compared to sulfation, when cellulose is swollen as a result of the presence of acetic acid 12, 13. The mechanism of this reaction involves dissolution of layers of cellulose fiber after its sulfation so that new surface is exposed for further reaction 14. The reaction is shown to be faster than acetylation at low temperatures 12.…”

Section: Reaction Chemistrymentioning

confidence: 99%

Reminiscence

Rubel¹

2003

J of Comparative Neurology

View full text Add to dashboard Cite

The batch acetylation of cellulose involves two main stages, acetylation followed by hydrolysis. Mathematical models were constructed for these processes using reaction parameters obtained from earlier publications. The two models were then combined, along with a model predicting the cellulose feedstock moisture content. The overall temperature profiles as well as the final degree of acetylation and polymerization were shown to match the data obtained from a commercial process. From the results of the model and the observations made in a typical process, it has been established that this process is highly sensitive to disturbances in the input streams that can result in unacceptable final properties of the batch. Because the exact disturbance occurring in a batch cannot be identified and measured, inferential control is used to formulate an intrabatch control strategy. Support vector regression is used to make predictions on the final properties of the batch. These predictions, along with the model of the hydrolysis stage, are used to estimate the inputs that, when applied during hydrolysis, can counter the disturbances caused during the acetylation stage. Simulations show that this hydrolysis control strategy can improve the average batch properties of cellulose acetate required for subsequent processing. © 2006 American Institute of Chemical Engineers AIChE J, 2006

show abstract

An investigation in solution acetylation of cellulose by microscopic techniques

Cited by 4 publications

References 0 publications

Synthesis and Characterization of Cellulose Derivatives from Industrial Towel Waste

Synthesis and Characterization of Cellulose Derivatives from Industrial Towel Waste

Critical Review on Sustainable Homogeneous Cellulose Modification: Why Renewability Is Not Enough

Reminiscence

Contact Info

Product

Resources

About