id:"swepub:oai:DiVA.org:kth-20301"
Search: id:"swepub:oai:DiVA.org:kth-20301" > Synthesis and prope...
- 1 of 1
- Previous record
- Next record
- To hitlist
Synthesis and properties of O-2- 2-(2-methoxyethoxy) ethoxy acetyl cellulose
-
- Zhou, Qi (author)
- KTH,Bioteknologi
- Zhang, L. N. (author)
- Okamura, H. (author)
- show more...
- Minoda, M. (author)
- Miyamoto, T. (author)
- show less...
- (creator_code:org_t)
- 2001
- 2001
- English.
- In: Journal of Polymer Science Part A. - 0887-624X .- 1099-0518. ; 39:3, s. 376-382
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- In this article, a series of O-2-[2-(2-methoxyethoxy)ethoxy] acetyl celluloses with different degree of substitution (DS) values was synthesized by a homogeneous reaction of cellulose with 2-[2-(2-methoxyethoxy)ethoxy] acetyl chloride in a 10% (w/w) dimethylacetamide/lithium chloride solution, combined with pyridine as the acid acceptor. The total DS values of the derivatives in anhydroglucose units was determined by H-1 and C-13 NMR spectra, and ranged from 0.4 to 3.0, depending on the amount of acid chloride in the reaction. The effects of the total DS values and the O-2-[2-(2-methoxyethoxy)ethoxy]acetyl acetyl substituent distribution on the solubility of the derivatives were investigated. The lowest limit of the DS value for water-soluble 0-2-[2-(2methoxyethoxy)ethoxy]acetyl cellulose was approximately 0.5, which is lower than that of methylcellulose. The amphiphilic derivatives with higher DS values than 1.7 exhibited a good solubility in both water and organic solvents, such as dimethyl sulfoxide, tetrahydrofuran, and chloroform. Sol-gel transition in aqueous solution was observed for the amphiphilic derivatives with a higher DS value than 1.7; the precipitation temperature (T-p) decreased as the DS value increased, showing that the derivatives are highly temperature sensitive. The thermal properties of the fully substituted derivative were measured using polarized microscopy, DSC, and X-ray diffraction; and are dis cussed in terms of phase transition of the sample derivatives.
Keyword
- cellulose ester
- degree of substitution
- sol-gel transition
- thermotropic liquid crystal
- substituent distribution
- acetylated derivatives
- flexible substituents
- water solubility
- excluded-volume
- polymers
- c-13-nmr
- acetate
- ethers
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
- Journal of Polymer Science Part A (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Zhou, Qi
- Zhang, L. N.
- Okamura, H.
- Minoda, M.
- Miyamoto, T.
- Articles in the publication
- Journal of Polym ...
- By the university
- Royal Institute of Technology
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
