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Preparation and properties of alkylated poly(styrene-graft-ethylene oxide)

Jannasch, Patric LU and Wesslén, Bengt LU (1995) In Journal of Polymer Science Part A: Polymer Chemistry 33(9). p.1465-1474
Abstract
Poly(styrene-graft-ethylene oxide), having alkyl chains (C-12 or C-18) on the polystyrene main chain or on the poly(ethylene oxide) (PEO) side chains, were synthesized. The main chain was alkylated by first ionizing amide groups in a styrene/acrylamide copolymer with tert-butoxide, and then using the amide anions as sites for reactions with 1-bromoalkanes. An excess of amide anions was used in the reaction, and the remaining anions were subsequently utilized as initiator sites for the anionic polymerization of ethylene oxide (EO). Synthesis of poly(styrene-graft-ethylene oxide) with alkylated side chains was accomplished by polymerization of EO onto the ionized styrene/acrylamide copolymer, followed by an alkylation of the terminal... (More)
Poly(styrene-graft-ethylene oxide), having alkyl chains (C-12 or C-18) on the polystyrene main chain or on the poly(ethylene oxide) (PEO) side chains, were synthesized. The main chain was alkylated by first ionizing amide groups in a styrene/acrylamide copolymer with tert-butoxide, and then using the amide anions as sites for reactions with 1-bromoalkanes. An excess of amide anions was used in the reaction, and the remaining anions were subsequently utilized as initiator sites for the anionic polymerization of ethylene oxide (EO). Synthesis of poly(styrene-graft-ethylene oxide) with alkylated side chains was accomplished by polymerization of EO onto the ionized styrene/acrylamide copolymer, followed by an alkylation of the terminal alkoxide anions with 1-bromoalkanes. The alkylated graft copolymers were structurally characterized by using elemental analysis, H-1 NMR, GPC, and IR spectroscopy. DSC analysis showed that only graft copolymers with PEO contents exceeding about 50 wt % had side chain crystallinities comparable to those of homo-PEO. Main chain alkylated graft copolymers generally had higher crystallinities, as compared to nonalkylated and side chain alkylated samples. The graft copolymers absorbed water corresponding to one water molecule per EO unit at low PEO contents. The water absorption increased progressively at PEO contents above 30 wt % for main chain alkylated samples and above 50 wt % for non-alkylated samples. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Polymer Science Part A: Polymer Chemistry
volume
33
issue
9
pages
1465 - 1474
publisher
John Wiley & Sons
external identifiers
  • scopus:84989762032
ISSN
1542-6238
DOI
10.1002/pola.1995.080330908
language
English
LU publication?
yes
id
af2f5c5b-1994-4f75-82d5-f337e1bb72dd (old id 142550)
date added to LUP
2007-07-13 12:26:58
date last changed
2017-09-24 04:28:03
@article{af2f5c5b-1994-4f75-82d5-f337e1bb72dd,
  abstract     = {Poly(styrene-graft-ethylene oxide), having alkyl chains (C-12 or C-18) on the polystyrene main chain or on the poly(ethylene oxide) (PEO) side chains, were synthesized. The main chain was alkylated by first ionizing amide groups in a styrene/acrylamide copolymer with tert-butoxide, and then using the amide anions as sites for reactions with 1-bromoalkanes. An excess of amide anions was used in the reaction, and the remaining anions were subsequently utilized as initiator sites for the anionic polymerization of ethylene oxide (EO). Synthesis of poly(styrene-graft-ethylene oxide) with alkylated side chains was accomplished by polymerization of EO onto the ionized styrene/acrylamide copolymer, followed by an alkylation of the terminal alkoxide anions with 1-bromoalkanes. The alkylated graft copolymers were structurally characterized by using elemental analysis, H-1 NMR, GPC, and IR spectroscopy. DSC analysis showed that only graft copolymers with PEO contents exceeding about 50 wt % had side chain crystallinities comparable to those of homo-PEO. Main chain alkylated graft copolymers generally had higher crystallinities, as compared to nonalkylated and side chain alkylated samples. The graft copolymers absorbed water corresponding to one water molecule per EO unit at low PEO contents. The water absorption increased progressively at PEO contents above 30 wt % for main chain alkylated samples and above 50 wt % for non-alkylated samples.},
  author       = {Jannasch, Patric and Wesslén, Bengt},
  issn         = {1542-6238},
  language     = {eng},
  number       = {9},
  pages        = {1465--1474},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Polymer Science Part A: Polymer Chemistry},
  title        = {Preparation and properties of alkylated poly(styrene-graft-ethylene oxide)},
  url          = {http://dx.doi.org/10.1002/pola.1995.080330908},
  volume       = {33},
  year         = {1995},
}