New results concerning the behavior of cellulose acetate in solutions and films by means of CD measurements.

Abstract:

:Cellulose acetate (DS = 2.45) was extensively investigated by Circular Dichroism (CD) in acetonitrile and dioxane. We found great differences between the CD spectra of a 1 wt % acetonitrile solution and the corresponding dioxane solution of cellulose acetate (CA) indicating that the macromolecules exist in those solutions in different molecular arrangements (e.g., persistence length, solvatation shell). The resulting morphologies could be transformed reversibly into each other, as we found by measuring the CA in mixtures of both solvents. Solid CA films show discernible CD spectra depending on the solvent they were evaporated from. In this way, we prepared solid films of the same polysaccharide owning different chiral properties. Furthermore, changes in the spectra occurred with increasing CA concentration. Basing upon our findings, some general statements concerning the polymer behavior of CA are possible.

journal_name

Biopolymers

journal_title

Biopolymers

authors

Meissner D,Einfeldt J,Schareina T

doi

10.1002/(SICI)1097-0282(199908)50:2<163::AID-BIP5>

subject

Has Abstract

pub_date

1999-08-01 00:00:00

pages

163-6

issue

2

eissn

0006-3525

issn

1097-0282

pii

10.1002/(SICI)1097-0282(199908)50:2<163::AID-BIP5>

journal_volume

50

pub_type

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