Heat Stability of Cellulose Acetate

Evans, Evan F.; McBurney, Lane F.

doi:10.1021/ie50474a026

Cited by 15 publications

(2 citation statements)

References 5 publications

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“…Promising prospective of carvacrol applications has stimulated researchers to study its incorporation into different polymers (e.g., cyclodextrin, cellulose, gelatin, and chitosan) for different purposes [10,11,23,24]. Cellulose acetate (CA) holds a great promise for food, pharmaceutical, and medicinal applications since it is stable, biocompatible, bioresorbable, and derived from cellulose, the world's most abundant biopolymer [7,[25][26][27]. Its good properties stimulated research focused on the generation of CA structures (membranes, foams, microparticles etc.)…”

Section: Introductionmentioning

confidence: 99%

Cellulose Acetate Based Material with Antibacterial Properties Created by Supercritical Solvent Impregnation

Milovanović

Adamović

Aksentijević

et al. 2017

International Journal of Polymer Science

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Supercritical CO 2 was used as a green solvent and impregnation medium for loading cellulose acetate beads with carvacrol in order to obtain a biomaterial with antibacterial properties. Supercritical solvent impregnation was performed in a high-pressure view cell at temperature of 50 ∘ C and pressures of 10, 21, and 30 MPa with the processing time ranging from 2 to 18 h. The rate of impregnation increased with the pressure increase. However, maximum impregnation yield (round 60%) was not affected by the pressure applied. Selected samples of the impregnated cellulose acetate containing 6-60% of carvacrol were proven to have considerable antibacterial effect against Gram-positive and Gram-negative bacterial strains including methicillin-resistant Staphylococcus aureus which causes severe infections in humans and animals. In addition, cellulose acetate beads containing 6.0-33.6% of carvacrol were shown to have a porous structure with submicron pores which is of interest for the controlled delivery applications.

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Section: Introductionmentioning

confidence: 99%

Cellulose Acetate Based Material with Antibacterial Properties Created by Supercritical Solvent Impregnation

Milovanović

Adamović

Aksentijević

et al. 2017

International Journal of Polymer Science

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“…When unsaturated ethers are oxidated, additional secondary reactions also take place: those of epoxy group formation at the expense of the double bond and those of crosslinking of the ether macromolecules. As a result of the formation of intermolecular bonds the solubility of oxidated ether lowers and gradually disappears and the degradation process can be 3 followed only when ether is oxidated in a dilute solution under mild conditions. Figure 6 shows that at the beginning of allyl cellulose oxidation its intrinsic viscosity [17] falls and then begins to grow.…”

Section: Resultsmentioning

confidence: 99%

On the mechanism of thermo‐oxidative degradation of cellulose ethers

Koz'mina

1967

J. polym. sci., C Polym. symp.

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Cellulose and alcohol ethers of aliphatic series, benzyl, allyl cellulose and other ethers containing labile hydrogen atoms were shown to undergo thermo‐oxidative degradation owing to the formation of peroxide in the ether groups and to their decomposition with the removal of the corresponding aldehydes, alcohols, alkylhydroperoxides, and other products and the break of the pyranose cycle. This has been established by the method of labeled atoms. It was also shown that the peroxide groups in ethers are partially transformed into the corresponding ester groups. The reaction of ethyl cellulose with oxygen was investigated in greater detail. Kinetic data on the formation of ether peroxides and of the products of their decomposition are given. Cellulose ethers and esters in whose ether and ester groups the labile hydrogen atoms are absent (tritylcellulose, pivalinates, benzoates, etc.) are much more resistant to thermo‐oxidative degradation.

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Physicochemical studies of cellulose acetate decomposition reactions

Parks¹,

Sperling²

1964

J of Applied Polymer Sci

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SynopsisThis work is a continuation in these laboratories of the study of the source of undesirable optical properties of molded cellulose acetate. The origin, mechanism of formation, and structure of the colored compounds formed upon heating cellulose acetate in the presence of plasticizer were studied. Extraction of heated mixtures gave evidence indicating the colored compounds are intermediates containing a conjugated carbonyl group. Efforts to fractionate and isolate color-causing fractions were defeated by the well-known solvent inclusion difficulties and upset of the little-understood salt balance in the sample. The effects of additives known to degrade cellulose acetate were determined by heating mixtures of these materials with cellulose acetate dissolved in excess plasticizer. Acidic compounds caused the expected severe degradation and color formation. Air oxidation and free radical initiators had very little effect compared to the acidic materials. Inhibitors of the action of acidic conipounds (neutralizers) and of oxidative degradation were studied.

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Heat Stability of Cellulose Acetate

Cited by 15 publications

References 5 publications

Cellulose Acetate Based Material with Antibacterial Properties Created by Supercritical Solvent Impregnation

Cellulose Acetate Based Material with Antibacterial Properties Created by Supercritical Solvent Impregnation

On the mechanism of thermo‐oxidative degradation of cellulose ethers

Physicochemical studies of cellulose acetate decomposition reactions

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