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Associative Multicomponent Polymers in Bulk and at Interfaces

Joabsson, Fredrik LU (2001)
Abstract (Swedish)
Popular Abstract in Swedish

Cellulosabaserade vattenlösliga polymerers egenskaper i lösning och vid ytor har undersökts. Tyngdpunkten har legat på interaktioner med tensider och på effekter av polymerenas utpräglade multikomponentnatur.
Abstract
The solution and interfacial properties of an associative water-soluble cellulose derivative, ethyl(hydroxyethyl)cellulose (EHEC) have been investigated. Main themes have been to study the effect of hydrophobic modification of the polymer (HM-EHEC) and the interactions with surfactants, both in bulk and at interfaces. The association strength of the HM-EHEC network was found to be modulated by either changing the tail length of the hydrophobic modification or by adding surfactants. It was also found that the bulk phase behaviour to a large extent couples with the interfacial phase behaviour. Addition of complexing ionic surfactants to a preadsorbed EHEC layer was found to cause a large swelling of the adsorbed layer at surfactant... (More)
The solution and interfacial properties of an associative water-soluble cellulose derivative, ethyl(hydroxyethyl)cellulose (EHEC) have been investigated. Main themes have been to study the effect of hydrophobic modification of the polymer (HM-EHEC) and the interactions with surfactants, both in bulk and at interfaces. The association strength of the HM-EHEC network was found to be modulated by either changing the tail length of the hydrophobic modification or by adding surfactants. It was also found that the bulk phase behaviour to a large extent couples with the interfacial phase behaviour. Addition of complexing ionic surfactants to a preadsorbed EHEC layer was found to cause a large swelling of the adsorbed layer at surfactant concentrations around the critical association concentration (cac), similar to the surfactant-induced swelling of macroscopic EHEC gels, while desorption of the polymer was observed at concentrations well above the cac. The polymer has a very heterogeneous structure, which was found to affect both the phase behaviour and the dynamics of the aqueous solutions. It was found that the presence of surfaces might cause a surface induced segregation of different polymer fractions. This can result in an exceptionally long-ranged attractive force between two surfaces. The findings were confirmed both by experiments with a model mixed polymer system containing dispersed particles, and also by lattice mean-field calculations of a mixed polymer system confined between two planar walls. (Less)
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author
opponent
  • Professor Claesson, Per, Stockholm
organization
publishing date
type
Thesis
publication status
published
subject
keywords
polymer adsorption, polymer self-diffusion, polymer-surfactant interactions, phase behaviour, ethyl(hydroxyethyl)cellulose, hydrophobically modified polymers, capillary-induced phase separation, Physical chemistry, Fysikalisk kemi
pages
168 pages
publisher
Physical Chemistry 1, Lund University
defense location
Room C, Chemical Center
defense date
2001-03-23 13:00
external identifiers
  • Other:ISRN: LUNKDL/NKFK--01/1057--SE
ISBN
91-7874-119-X
language
English
LU publication?
yes
id
9717fd7f-e03e-4615-bd47-f98f119cefdf (old id 41324)
date added to LUP
2007-08-01 09:44:16
date last changed
2016-09-19 08:45:03
@misc{9717fd7f-e03e-4615-bd47-f98f119cefdf,
  abstract     = {The solution and interfacial properties of an associative water-soluble cellulose derivative, ethyl(hydroxyethyl)cellulose (EHEC) have been investigated. Main themes have been to study the effect of hydrophobic modification of the polymer (HM-EHEC) and the interactions with surfactants, both in bulk and at interfaces. The association strength of the HM-EHEC network was found to be modulated by either changing the tail length of the hydrophobic modification or by adding surfactants. It was also found that the bulk phase behaviour to a large extent couples with the interfacial phase behaviour. Addition of complexing ionic surfactants to a preadsorbed EHEC layer was found to cause a large swelling of the adsorbed layer at surfactant concentrations around the critical association concentration (cac), similar to the surfactant-induced swelling of macroscopic EHEC gels, while desorption of the polymer was observed at concentrations well above the cac. The polymer has a very heterogeneous structure, which was found to affect both the phase behaviour and the dynamics of the aqueous solutions. It was found that the presence of surfaces might cause a surface induced segregation of different polymer fractions. This can result in an exceptionally long-ranged attractive force between two surfaces. The findings were confirmed both by experiments with a model mixed polymer system containing dispersed particles, and also by lattice mean-field calculations of a mixed polymer system confined between two planar walls.},
  author       = {Joabsson, Fredrik},
  isbn         = {91-7874-119-X},
  keyword      = {polymer adsorption,polymer self-diffusion,polymer-surfactant interactions,phase behaviour,ethyl(hydroxyethyl)cellulose,hydrophobically modified polymers,capillary-induced phase separation,Physical chemistry,Fysikalisk kemi},
  language     = {eng},
  pages        = {168},
  publisher    = {ARRAY(0xab2c580)},
  title        = {Associative Multicomponent Polymers in Bulk and at Interfaces},
  year         = {2001},
}