Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers.

Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Research Abstract Details 

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Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Abstract Text:

V Kumar,D Yang,

Oxidized cellulose acetates (OCA), with a degree of substitution (DS) value ranging between 1.1 and 2.3 and a free carboxylic acid group content of 20% (w/w), have been prepared by reacting oxidized cellulose (OC, COOH content 20% w/w) with a mixture of acetic acid and acetic anhydride in the presence of sulfuric acid as a catalyst. The DS of OCA, in general, increased with increasing reaction temperature, reaction time, and concentration of acetic anhydride in the reaction mixture. The yield of OCA, in contrast, increased with increasing concentration of acetic anhydride and decreased with increasing reaction time and temperature. The intrinsic viscosity of OCA varied between 0.100 and 0.275, depending on the reaction conditions used during its preparation. In general, an increase in reaction temperature and the use of a prolonged reaction time decreased the intrinsic viscosity of OCA. No correlation was found between DS and intrinsic viscosity of OCA. The apparent pKa of OCA is 3.7-3.9. The new OCA polymers are practically insoluble in water and slowly dissolve in pH 7.4 phosphate buffer solution. They are, however, soluble in a range of organic solvents (e.g. ethyl acetate, acetone, acetone/water, chloroform/methylene chloride, dimethylsulfoxide, dimethylformamide, and/or chloroform/methanol).

Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Publishing Authors By Initials

V Kumar,D Yang,

For similar investigative techniques: chemistry, analytical: crystallography: x-ray diffraction research abstracts see: investigative techniques: chemistry, analytical: crystallography: x-ray diffraction research

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Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biomaterials science. Polymer edition

VOLUME: 13

Page Numbers: 273-86

Journal Abbreviation:

ISSN: 0920-5063

DAY: 20

MONTH: 02

YEAR: 2002

Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Information

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LANGUAGE: eng

NlmUniqueID: 9007393

Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Keywords Mesh Terms:

KEYWORDS: X-Ray Diffraction

MESH TERMS: chemistry

Chemical & Substance for Abstract: Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers. Information

Substance Name: Cellulose, Oxidized

Registry Number: 9032-53-5

Grant and Affiliation Information for Oxidized cellulose esters: I. Preparation and characterization of oxidized cellulose acetates--a new class of biodegradable polymers.

AFFILIATION: Division of Pharmaceutics, College of Pharmacy, The University of Iowa, Iowa City 52242, USA. vijay-kumar@uiowa.edu

Country: Netherlands

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MEDLINETA: J Biomater Sci Polym Ed

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