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Anionic Graft Copolymers with Poly(ethylene oxide) Side-Chains; Synthesis, Solution Properties and Ion Conduction

Dérand, Helene LU (1997)
Abstract (Swedish)
Popular Abstract in Swedish

Trots att "block- och ymp- sampolymerer" låter obekant i de flestas öron, kommer vi i kontakt med dem i det vardagliga livet. De kan användas till en rad olika produkter t.ex. leksaker, färg, papper, tvättmedel, läkemedel, kosmetika och i bilar.



Denna avhandling handlar om framställning och karatärisering av ympsampolymerer, samt studier av deras egenskaper i vattenlösningar och jonledningsförmåga i fast fas.
Abstract
The research underlaying this thesis involves synthesis and characterization of well-defined anionic graft copolymers carrying poly(ethylene oxide) (PEO) side-chains. Two different grafting techniques were used.



Backbone polymers were prepared through radical terpolymerization of maleic anhydride, styrene and an additional comonomer. Poly(ethylene oxide) monomethyl ether (MPEO) were grafted onto the backbone through reactions with the cyclic anhydride residues. The reaction rate was found to be dependent of both the neighbouring groups in the polymer backbone and the molecular weight of the MPEO.



In the second method, polyamide 12 and poly(ethylene-co-vinyl alcohol) were used as backbone polymers. The... (More)
The research underlaying this thesis involves synthesis and characterization of well-defined anionic graft copolymers carrying poly(ethylene oxide) (PEO) side-chains. Two different grafting techniques were used.



Backbone polymers were prepared through radical terpolymerization of maleic anhydride, styrene and an additional comonomer. Poly(ethylene oxide) monomethyl ether (MPEO) were grafted onto the backbone through reactions with the cyclic anhydride residues. The reaction rate was found to be dependent of both the neighbouring groups in the polymer backbone and the molecular weight of the MPEO.



In the second method, polyamide 12 and poly(ethylene-co-vinyl alcohol) were used as backbone polymers. The amide and the hydroxyl groups were utilized as initiating sites for the anionic polymerization of ethylene oxide. The molecular weight of the grafts could be controlled by the ratios of the reactants used in the preparation. The PEO side-chains were endcapped by sulfonic acid groups, in a base-catalyzed ring-opening reaction between the hydroxyl groups and 1,3 propane sultone.



The graft copolymers displayed a complex behavior in aqueous solution. Aggregation of these graft copolymers were strongly dependent on the salt concentration. Upon neutralization of the acid groups, typical polyelectrolyte behavior was experienced



Single-ion conducting polymer electrolytes were obtained by doping the graft copolymers by alkali metal salts. Their ionic conductivity and dieletric properties were evaluated by impedance spectroscopy. The highest conductivity, 2*10-5 S/cm, at 80°C, was obtained for a rubberlike polymer with amorphous side-chains and sulfonic acid groups as anions. The fraction of ion pairs was found to increase with increasing temperature. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Professor Kops, Jörgen, Danmarks Tekniske Universitet, Danmark.
organization
publishing date
type
Thesis
publication status
published
subject
keywords
dieletric properites, ion conduction, solution properties, aggregation, amphiphilic polymers, poly(ethylene oxide), preparation, grafting, Polymer technology, biopolymers, Polymerteknik
pages
135 pages
publisher
Chemical Engineering 2, Lund University
defense location
May 29, 1997 at 13.15, lecture hall A, Center for Chemistry and Chemical Engineering
defense date
1997-05-29 13:15
external identifiers
  • Other:ISRN: LUTKDH/TKKT--97/1045--SE
ISBN
91-628-2533-X
language
English
LU publication?
yes
id
8db194e9-b8ab-484a-acf6-c27acb19d44d (old id 29426)
date added to LUP
2007-06-14 09:09:52
date last changed
2016-09-19 08:45:08
@phdthesis{8db194e9-b8ab-484a-acf6-c27acb19d44d,
  abstract     = {The research underlaying this thesis involves synthesis and characterization of well-defined anionic graft copolymers carrying poly(ethylene oxide) (PEO) side-chains. Two different grafting techniques were used.<br/><br>
<br/><br>
Backbone polymers were prepared through radical terpolymerization of maleic anhydride, styrene and an additional comonomer. Poly(ethylene oxide) monomethyl ether (MPEO) were grafted onto the backbone through reactions with the cyclic anhydride residues. The reaction rate was found to be dependent of both the neighbouring groups in the polymer backbone and the molecular weight of the MPEO.<br/><br>
<br/><br>
In the second method, polyamide 12 and poly(ethylene-co-vinyl alcohol) were used as backbone polymers. The amide and the hydroxyl groups were utilized as initiating sites for the anionic polymerization of ethylene oxide. The molecular weight of the grafts could be controlled by the ratios of the reactants used in the preparation. The PEO side-chains were endcapped by sulfonic acid groups, in a base-catalyzed ring-opening reaction between the hydroxyl groups and 1,3 propane sultone.<br/><br>
<br/><br>
The graft copolymers displayed a complex behavior in aqueous solution. Aggregation of these graft copolymers were strongly dependent on the salt concentration. Upon neutralization of the acid groups, typical polyelectrolyte behavior was experienced<br/><br>
<br/><br>
Single-ion conducting polymer electrolytes were obtained by doping the graft copolymers by alkali metal salts. Their ionic conductivity and dieletric properties were evaluated by impedance spectroscopy. The highest conductivity, 2*10-5 S/cm, at 80°C, was obtained for a rubberlike polymer with amorphous side-chains and sulfonic acid groups as anions. The fraction of ion pairs was found to increase with increasing temperature.},
  author       = {Dérand, Helene},
  isbn         = {91-628-2533-X},
  keyword      = {dieletric properites,ion conduction,solution properties,aggregation,amphiphilic polymers,poly(ethylene oxide),preparation,grafting,Polymer technology,biopolymers,Polymerteknik},
  language     = {eng},
  pages        = {135},
  publisher    = {Chemical Engineering 2, Lund University},
  school       = {Lund University},
  title        = {Anionic Graft Copolymers with Poly(ethylene oxide) Side-Chains; Synthesis, Solution Properties and Ion Conduction},
  year         = {1997},
}