Please use this identifier to cite or link to this item:
https://open.uns.ac.rs/handle/123456789/10632
Title: | Viscosity sinergism of hydrozypropmethyl and carboxy methyl cellulose | Authors: | Katona, Jaroslav Sovilj, Verica Petrović, Lidija |
Issue Date: | 2008 | Publisher: | Belgrade: Association of the Chemical Engineers of Serbia | Journal: | Hemijska Industrija | Abstract: | Rheology modifiers are common constituents of food, cosmetic and pharmaceutic products. Often, by using two or more of them, better control of the product rheological properties can be achieved. In this work, rheological properties of hydroxypropymethyl cellulose (HPMC) and sodium carboxymethyl cellulose (NaCMC) solutions of different concentrations were investigated and compared to the flow properties of 1% HPMC/NaCMC binary mixtures at various HPMC/NaCMC mass ratios. Solutions of HPMC and NaCMC were found to be pseudo- plastic, where pseudoplasticity increases with increase in the macromole- cules concentration. Changes of the degree of pseudoplasticity, n as well as the coefficient of consistency, K with the concentration are more pronounced in HPMC solutions when compared to the NaCMC ones. This is mostly due to the ability of HPMC molecules to associate with each other at concentrations above critical overlap concentration, c*, and greater flexibility of macromolecular chains. Binary mixtures of HPMC/NaCMC were also found to be pseudoplastic. Experimentally obtained viscosities of the mixture were proved to be larger than theoretically expected ones, indicating viscosity synergism as a consequence of HPMC-NaCMC interaction. Maximum in synergy was observed when HPMC/NaCMC mass ratio was 0.4/0.6, no matter of the shear rate applied. On the other hand, it was found that relative positive deviation, RPD decreases when shear rate is increased. | URI: | https://open.uns.ac.rs/handle/123456789/10632 | ISSN: | 0367598X | DOI: | 10.2298/HEMIND0801031K |
Appears in Collections: | TF Publikacije/Publications |
Show full item record
SCOPUSTM
Citations
2
checked on May 3, 2024
Page view(s)
24
Last Week
13
13
Last month
0
0
checked on May 10, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.