SwePub
Sök i LIBRIS databas

  Utökad sökning

WFRF:(Miyamoto M.)
 

Sökning: WFRF:(Miyamoto M.) > (2000-2004) > Synthesis and prope...

  • Zhou, QiKTH,Bioteknologi (författare)

Synthesis and properties of O-2- 2-(2-methoxyethoxy) ethoxy acetyl cellulose

  • Artikel/kapitelEngelska2001

Förlag, utgivningsår, omfång ...

  • 2001
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:kth-20301
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-20301URI
  • https://doi.org/10.1002/1099-0518(20010201)39:3<376::AID-POLA1004>3.3.CO;2-QDOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20100525
  • 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.

Ämnesord och genrebeteckningar

  • 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

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Zhang, L. N. (författare)
  • Okamura, H. (författare)
  • Minoda, M. (författare)
  • Miyamoto, T. (författare)
  • KTHBioteknologi (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Journal of Polymer Science Part A39:3, s. 376-3820887-624X1099-0518

Internetlänk

Hitta via bibliotek

Till lärosätets databas

Sök utanför SwePub

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.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy