Experimental and Theoretical Study of Phase Separation in Aqueous Solutions of Clouding Polymers and Carboxylic Acids
(1993) In Macromolecules 26(17). p.4478-4483- Abstract
The phase behavior of different carboxylic acids/nonionic polymer/water systems has been studied. The carboxylic acids investigated are acetic acid, propionic acid, and butyric acid. The polymers used are a linear random copolymer of ethylene oxide and propylene oxide (UCON) and ethyl(hydroxyethyl)-cellulose (EHEC). These polymers display a lower critical solution temperature (LCST) in water. The decrease of the polarity in the carboxylic acids as the carbon chain increases causes a decrease of the LCST of the system carboxylic acid/polymer/water. As a consequence of this the two-phase region expands. The experimentally determined phase diagrams can qualitatively be described and compared with a theoretical model, based on Flory-Huggins... (More)
The phase behavior of different carboxylic acids/nonionic polymer/water systems has been studied. The carboxylic acids investigated are acetic acid, propionic acid, and butyric acid. The polymers used are a linear random copolymer of ethylene oxide and propylene oxide (UCON) and ethyl(hydroxyethyl)-cellulose (EHEC). These polymers display a lower critical solution temperature (LCST) in water. The decrease of the polarity in the carboxylic acids as the carbon chain increases causes a decrease of the LCST of the system carboxylic acid/polymer/water. As a consequence of this the two-phase region expands. The experimentally determined phase diagrams can qualitatively be described and compared with a theoretical model, based on Flory-Huggins theory of polymer solubility. The cloud-point temperature of the systems decreases as the difference between the effective interaction of polymer-cosolute and cosolute-water increases.
(Less)
- author
- Johansson, Hans-Olof LU ; Karlström, Gunnar LU and Tjerneld, Folke LU
- organization
- publishing date
- 1993-01-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Macromolecules
- volume
- 26
- issue
- 17
- pages
- 6 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:0027648619
- ISSN
- 0024-9297
- DOI
- 10.1021/ma00069a012
- language
- English
- LU publication?
- yes
- id
- a0cd0ee3-2d86-4013-815c-63bddd470f34
- date added to LUP
- 2019-06-24 16:25:30
- date last changed
- 2023-04-09 18:28:12
@article{a0cd0ee3-2d86-4013-815c-63bddd470f34,
abstract = {{<p>The phase behavior of different carboxylic acids/nonionic polymer/water systems has been studied. The carboxylic acids investigated are acetic acid, propionic acid, and butyric acid. The polymers used are a linear random copolymer of ethylene oxide and propylene oxide (UCON) and ethyl(hydroxyethyl)-cellulose (EHEC). These polymers display a lower critical solution temperature (LCST) in water. The decrease of the polarity in the carboxylic acids as the carbon chain increases causes a decrease of the LCST of the system carboxylic acid/polymer/water. As a consequence of this the two-phase region expands. The experimentally determined phase diagrams can qualitatively be described and compared with a theoretical model, based on Flory-Huggins theory of polymer solubility. The cloud-point temperature of the systems decreases as the difference between the effective interaction of polymer-cosolute and cosolute-water increases.</p>}},
author = {{Johansson, Hans-Olof and Karlström, Gunnar and Tjerneld, Folke}},
issn = {{0024-9297}},
language = {{eng}},
month = {{01}},
number = {{17}},
pages = {{4478--4483}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Macromolecules}},
title = {{Experimental and Theoretical Study of Phase Separation in Aqueous Solutions of Clouding Polymers and Carboxylic Acids}},
url = {{http://dx.doi.org/10.1021/ma00069a012}},
doi = {{10.1021/ma00069a012}},
volume = {{26}},
year = {{1993}},
}