Capillary breakup extensional rheometry (CaBER) of sodium carboxymethylcellulose solutions in water and propylene glycol/water mixtures

The paper presents the results of CaBER experiments conducted for semidilute solutions of carboxymethylcellulose sodium salt (Na-CMC) with the degrees of substitution (DS) ranging from 0.62 to 1.04 in distilled water and propylene glycol (PG)/water mixture. The partial aggregation of Na-CMC chains with DS < 1 observed in aqueous solutions triggers an increase in apparent extensional viscosity and extension of break-up time. The rheological properties of Na-CMC solutions in propylene glycol/water mixture are determined by the solubility of the polymer and the physical crosslinking of chains. The disappearance of the elasto-capillary regime during the filament thinning of Na-CMC solutions with DS < 1 in propylene glycol/water mixture was linked to the physical crosslinking of polymer chains. The shape of the extensional viscosity curve for Na-CMC solutions with DS = 1.04 in PG/water mixture was characteristic for semidilute polymer solutions with a low number of entanglements.

Jaar van publicatie:2019

BOF-keylabel:ja

IOF-keylabel:ja

BOF-publication weight:1

CSS-citation score:1

Auteurs:International

Authors from:Higher Education

Toegankelijkheid:Open