Chitin-based poly(urea-urethane)s.

Chitin-based poly(urea-urethane)s. Research Abstract Details 

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Chitin-based poly(urea-urethane)s. Abstract Text:

R A Muzzarelli,P Ilari,M Tomasetti,

Chitins of various origins in DMA-LiCl solution have been reacted with excess 1,6-diisocyanatohexane (three or twelve equivalents per repeating unit) for 4-20 h. The resulting solutions were exposed to water vapor for 2 days and flexible and opaque materials were produced, which upon drying yielded powders whose main characteristics were insolubility in aqueous and organic solvents, remarkable crystallinity, typical infrared spectrum, high N/C ratio (0.287), and a high degree of substitution (0.29). Under the SEM structural features reminiscent of chitin were absent but no thermoplastic behavior was found by differential scanning calorimetry. Chitosan was similarly treated under heterogeneous conditions in anhydrous pyridine, and yielded reaction products with a lower degree of substitution (0.17). With partially hydrolysed chitosan, highly crystalline products were obtained.

Chitin-based poly(urea-urethane)s. Publishing Authors By Initials

RA Muzzarelli,P Ilari,M Tomasetti,

For similar organic chemicals: urea research abstracts see: organic chemicals: urea research

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Chitin-based poly(urea-urethane)s. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biomaterials science. Polymer edition

VOLUME: 6

Page Numbers: 541-7

Journal Abbreviation:

ISSN: 0920-5063

DAY: 20

MONTH: 02

YEAR: 1994

Chitin-based poly(urea-urethane)s. Information

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LANGUAGE: eng

NlmUniqueID: 9007393

Chitin-based poly(urea-urethane)s. Keywords Mesh Terms:

KEYWORDS: Urea

MESH TERMS: chemistry

Chemical & Substance for Abstract: Chitin-based poly(urea-urethane)s. Information

Substance Name: Chitosan

Registry Number: 9012-76-4

Grant and Affiliation Information for Chitin-based poly(urea-urethane)s.

AFFILIATION: Faculty of Medicine, University of Ancona, Italy.

Country: NETHERLANDS

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MEDLINETA: J Biomater Sci Polym Ed

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