Solution Behavior of Hydrophobic Cationic Hydroxyethyl Cellulose

“…Their advantages are low cost, biodegradability and low toxicity [ 3 , 4 ]. Cationized celluloses and other polysaccharides have been studied intensively in recent decades as flocculants, paper additives, hair care products and absorbent materials [ 3 , 4 , 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

The effect of mixing and consistency on cellulose cationization

Willberg‐Keyriläinen

Pitkänen

Hulkko

et al. 2019

Heliyon

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Traditional chemical modifications of cellulose are usually done at low or medium consistencies. Processing at high solids content is expected to provide a leap forward in reduction of manufacturing costs such as minimization of chemical use, energy consumption and decreasing processing equipment size, while at the same time increasing reaction efficiency. In this research, high consistency modifications of cellulose were studied through cationization reaction. Four different laboratory scale high consistency reactors were tested and the effect of mixing on fiber properties was analyzed. All reactors decreased cellulose fiber length and no significant difference between cellulose starting consistencies and mixing time on fiber properties were found. The cationization reaction efficiency increased as the cellulose starting consistency increased in all of the tested reactors. In addition, mercerization of pulp as pretreatment, significantly increased reaction efficiency.

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Insight into the rheological behaviors of a polyanionic collagen fabricated with poly(γ‐glutamic acid)‐NHS ester

Ding

Yang

Lan

et al. 2019

Biotech and App Biochem

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The rheological behaviors of a polyanionic collagen, fabricated using poly(γ -glutamic acid)-N-hydroxysuccinimide (γ -PGA-NHS) as a novel modifier, were investigated in this study. It was found that both of the native and modified collagen solutions were pseudoplastic fluids, as shown from the steady-shear tests. While the storage modulus and loss modulus of collagen increased with increasing the amount of γ -PGA-NHS, or with increasing the degree of esterification of γ -PGA-NHS; meanwhile, the dynamic denaturation temperature determined by dynamic temperature sweep was also increased, indicating an improved thermal stability of collagen solution modified by γ -PGA-NHS. The creeprecovery measurements showed that the resistance to deformation was enhanced for modified collagen, probably due to the cross-linking occurred between the ε-amino groups of collagen molecules and α-COOH groups of γ -PGA-NHS, as well as the electrostatic interaction and hydrogen-bond interactions between the two molecules. Furthermore, the aggregation of collagen fibers was promoted due to these interactions between collagen and γ -PGA-NHS as observed by atomic force morphology. In addition, the modified collagen exhibited good cytocompatibility as demonstrated by cell growth culturing. The obtained information was expected to give valuable clues to the design and fabrication of controlled stable collagen-based products for applications in various biomedical fields.

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Solution Behavior of Hydrophobic Cationic Hydroxyethyl Cellulose

Cited by 10 publications

References 18 publications

Ductile nanocellulose-based films with high stretchability and tear resistance

Ductile nanocellulose-based films with high stretchability and tear resistance

The effect of mixing and consistency on cellulose cationization

Insight into the rheological behaviors of a polyanionic collagen fabricated with poly(γ‐glutamic acid)‐NHS ester

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