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Effect of a polymeric additive on the pore-size distribution and shrinking process of a hydrogel network

Lynch, Iseult LU and Dawson, K A (2003) In Macromolecular Chemistry and Physics 204(3). p.443-450
Abstract
A systematic comparison of the effect of architectural modifications to the network structure on the internal microstructure of N-isopropylacrylamide (NIPA) based hydrogels showed that the addition of a second component to the network significantly increased the proportion of macropores in the network. The second components considered were

short poly(N-isopropylacrylamide)(PNIPAM) chains grafted to the network backbone, high-molecular-weight polyacrylamide (PAM) chains, or microsphere particles of PNIPAM. Structures are proposed for each of the modified gel networks taking into account the new structural information. Through combination of the pore size and network structure data reported here, and with the shrinking data obtained... (More)
A systematic comparison of the effect of architectural modifications to the network structure on the internal microstructure of N-isopropylacrylamide (NIPA) based hydrogels showed that the addition of a second component to the network significantly increased the proportion of macropores in the network. The second components considered were

short poly(N-isopropylacrylamide)(PNIPAM) chains grafted to the network backbone, high-molecular-weight polyacrylamide (PAM) chains, or microsphere particles of PNIPAM. Structures are proposed for each of the modified gel networks taking into account the new structural information. Through combination of the pore size and network structure data reported here, and with the shrinking data obtained previously, shrinking mechanisms are proposed for each of the modified network structures. In all cases, the enhanced shrinking rates were directly caused by the presence of the second component, which acted as nuclei for shrinking (graft-PNIPAM and PNIPAM microspheres) or as water-release channels (PAM gel), and indirectly caused by the second components via their affect on the network microstructure. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Macromolecular Chemistry and Physics
volume
204
issue
3
pages
443 - 450
publisher
John Wiley & Sons
external identifiers
  • wos:000182127000009
  • scopus:0037430064
ISSN
1521-3935
DOI
10.1002/macp.200390011
language
English
LU publication?
yes
id
0cd51cf7-ca06-4649-91e7-0c623dde6f20 (old id 122088)
date added to LUP
2007-07-11 15:50:44
date last changed
2018-10-03 11:40:56
@article{0cd51cf7-ca06-4649-91e7-0c623dde6f20,
  abstract     = {A systematic comparison of the effect of architectural modifications to the network structure on the internal microstructure of N-isopropylacrylamide (NIPA) based hydrogels showed that the addition of a second component to the network significantly increased the proportion of macropores in the network. The second components considered were<br/><br>
short poly(N-isopropylacrylamide)(PNIPAM) chains grafted to the network backbone, high-molecular-weight polyacrylamide (PAM) chains, or microsphere particles of PNIPAM. Structures are proposed for each of the modified gel networks taking into account the new structural information. Through combination of the pore size and network structure data reported here, and with the shrinking data obtained previously, shrinking mechanisms are proposed for each of the modified network structures. In all cases, the enhanced shrinking rates were directly caused by the presence of the second component, which acted as nuclei for shrinking (graft-PNIPAM and PNIPAM microspheres) or as water-release channels (PAM gel), and indirectly caused by the second components via their affect on the network microstructure.},
  author       = {Lynch, Iseult and Dawson, K A},
  issn         = {1521-3935},
  language     = {eng},
  number       = {3},
  pages        = {443--450},
  publisher    = {John Wiley & Sons},
  series       = {Macromolecular Chemistry and Physics},
  title        = {Effect of a polymeric additive on the pore-size distribution and shrinking process of a hydrogel network},
  url          = {http://dx.doi.org/10.1002/macp.200390011},
  volume       = {204},
  year         = {2003},
}