Influence of the Substitution Degree on the Dilute Solution Properties of Cellulose Acetate

Necula, Adina Maria; Olaru, Niculae; Olaru, Liliana; Ioan, Silvia

doi:10.1080/00222340802216095

Cited by 12 publications

(9 citation statements)

References 27 publications

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“…In addition, a previous article9 shows that decreasing of solvation power, observed from viscometric studies in dilute solution, and increasing of the gelation process detected by rheological data generates an increased pore number in the CA films.…”

Section: Results and Disscusionmentioning

confidence: 88%

“…According to Table II, CA possess different domain of solubility, depending on the substitution degrees. For this reason, the compositions of nonsolvent mixtures used in the paper are 0.15, 0.25, 0.25, and 0.10% vol, for CA 1.73 , CA 1.88, CA 1.90 , and CA 2.21 , respectively (see previous studies) 9, 10…”

Section: Methodsmentioning

confidence: 99%

“…The conformational behavior and the unperturbed dimensions of CA with different substitution degrees were investigated by viscometry and interferometry in 2‐methoxyethanol and acetone/water solvent mixtures. The influence of concentration and temperature on coil densities and dimensions, as well as that of solvent mixtures composition on the solution properties were discussed 9. Also, rheology results showed a sol–gel behavior, a case in which the specific properties are modified as a function of solvent mixture composition.…”

Section: Introductionmentioning

confidence: 99%

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Surface properties and biocompatibility of cellulose acetates

Dobos¹,

Stoica²,

Olaru³

et al. 2012

J of Applied Polymer Sci

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The article describes some properties of cellulose acetates (CAs) with different substitution degrees. The hydrophilic/hydrophobic properties, morphological aspects, and interface properties with red blood cells and platelets are affected by the substitution degree, synthesis conditions, history of the formed films from solutions in acetone/water nonsolvent/nonsolvent mixtures, and low pressure plasma treatment. The results obtained are useful in biomedical applications, including evaluation of bacterial adhesion onto surfaces, or utilization of CA for semipermeable membranes.

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Section: Results and Disscusionmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface properties and biocompatibility of cellulose acetates

Dobos¹,

Stoica²,

Olaru³

et al. 2012

J of Applied Polymer Sci

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“…Necula et al studied several polymeric solutions of CA in acetone 95% v/v at different concentrations up to 0.4 g/mL, at different temperatures (from 20 to 50 °C). CA critical concentration at which the polymer coils begin to overlap with each other (0.013 > c* > 0.018 g/mL), as well as the critical concentration for reaching the unperturbed state, c + (0.098 > c + > 0.142 g/mL) (c + ≅ 8 c*), were determined [ 58 ]. Thus, in the present work, in order to ensure that the cellulose acetate coils in acetone (or acetone with low amounts of water as non-solvent, i.e., acetone > 90%) were able to contract toward the unperturbed size state, the selected concentration of CA and/or CA-CM film-forming solution was 0.15 g/mL.…”

Section: Resultsmentioning

confidence: 99%

Cucumis metuliferus Fruit Extract Loaded Acetate Cellulose Coatings for Antioxidant Active Packaging

et al. 2020

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A new active coating was developed by using Cucumis metuliferus fruit extract as antioxidant additive with the aim of obtaining an easy way to functionalize low-density polyethylene (LDPE) films for food packaging applications. Thus, an extraction protocol was first optimized to determine the total phenolic compounds and the antioxidant activity of CM. The aqueous CM antioxidant extract was then incorporated into cellulose acetate (CA) film-forming solution in different concentrations (1, 3 and 5 wt.%) to be further coated in corona-treated LDPE to obtain LDPE/CA-CM bilayer systems. CA and CA-CM film-forming solutions were successfully coated onto the surface of LDPE, showing good adhesion in the final bilayer structure. The optical, microstructural, thermal, mechanical and oxygen barrier performance, as well as the antioxidant activity, were evaluated. The active coating casted onto the LDPE film did not affect the high transparency of LDPE and improved the oxygen barrier performance. The antioxidant effectiveness of bilayer packaging was confirmed by release studies of Cucumis metuliferus from the cellulose acetate layer to a fatty food simulant. Finally, the LDPE/CA-CM active materials were also tested for their application in minimally processed fruits, and they demonstrated their ability to reduce the oxidation process of fresh cut apples. Thus, the obtained results suggest that CA-CM-based coating can be used to easily introduce active functionality to typically used LDPE at industrial level and enhance its oxygen barrier, without affecting the high transparency, revealing their potential application in the active food packaging sector to extend the shelf-life of packaged food by prevention of lipid oxidation of fatty food or by prevention fruit browning.

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“…The conformational behavior and the unperturbed dimensions of cellulose acetates with different substitution degrees were investigated by viscometry and interferometry, in 2-methoxy ethanol and acetone/water nonsolvent mixtures. The influence of concentration and temperature on coil densities and dimensions, as well as the influence of nonsolvent mixtures composition on the solution properties were discussed [10]. Furthermore, rheology results show a sol-gel behavior, a case in which the specific properties are modified as a function of nonsolvent mixture compositions.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Cellulose Acetate

Ioan¹,

Necula²,

Stoica³

et al. 2010

High Performance Polymers

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Cellulose acetates with different substitution degrees were investigated as to their surface tension properties and morphology. Atomic force microscopy (AFM) studies on membranes, obtained from solution in acetone/water nonsolvent mixtures, evidenced pores and nodules of different size and intensity, depending on the substitution degrees of cellulose acetate and on the water contents in nonsolvent mixtures. Modification of hydrophilicity, put into evidence by the apolar components and by the electron acceptor and electron donor parameters of the polar components, was correlated with the pores volumes — influenced both by their diameter and depths, and by surface roughness as illustrated by AFM images. Surface wettability trends were also studied by means of the free energy of hydration between compounds and water.

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Influence of the Substitution Degree on the Dilute Solution Properties of Cellulose Acetate

Cited by 12 publications

References 27 publications

Surface properties and biocompatibility of cellulose acetates

Surface properties and biocompatibility of cellulose acetates

Cucumis metuliferus Fruit Extract Loaded Acetate Cellulose Coatings for Antioxidant Active Packaging

Surface Properties of Cellulose Acetate

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