ISSN:
0887-6266
Schlagwort(e):
cellulose and cellulose triacetate in TFA-CH2Cl2 solvent mixtures
;
solvent interactions of cellulose and cellulose triacetate in ternary mixtures with trifluoroacetic acid and CH2Cl2
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
There is little or no trifluoroacetylation of cellulose dissolved in TFA-CH2Cl2 admixtures. Both cellulose and cellulose triacetate (CTA)are slowly degraded in the solvent. Cellulose forms a mesophase as low as 4%(w/w)concentration, but CTA has a much higher critical concentration, 20% (w/w), in TFA-CH2Cl2. The cellulose behaves as a rigid rod in TFA-CH2Cl2 (70/30v/v) and its persistence length calculated using the lattice model approximates its chain length, presumably due to extensive interaction with the solvent. As expected, due to low polymer-solvent interactions, the persistence length of CTA in TFA-CH2Cl2 is only one-fourth the chain length.
Zusätzliches Material:
8 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/polb.1991.090291305
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