Effect of solvent interactions on swelling and microstructure of amphiphilic polyurethane networks
Amphiphilic polyurethane (PU) ionomer networks were synthesized by urethane acrylate anionomer (UAA) precursor chains. These networks were prepared with water, dioxane (DO), and dimethyl sulfoxide (DMSO) and exhibited very different swelling behaviors in water/DO (UAADG) and water/DMSO (UAASG) solve...
Saved in:
Published in | Journal of applied polymer science Vol. 79; no. 4; pp. 608 - 620 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York
John Wiley & Sons, Inc
24.01.2001
Wiley |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Amphiphilic polyurethane (PU) ionomer networks were synthesized by urethane acrylate anionomer (UAA) precursor chains. These networks were prepared with water, dioxane (DO), and dimethyl sulfoxide (DMSO) and exhibited very different swelling behaviors in water/DO (UAADG) and water/DMSO (UAASG) solvent mixtures, which was due to the different solvent interactions between water/DO and water/DMSO. The additional important factor influencing the swelling behavior in water/aprotic solvent mixtures was the hydrophilicity of the UAA networks, which was different than the water–UAA network interaction. The microstructure of UAA networks prepared with the water/aprotic solvent mixtures was greatly influenced by the water–solvent interactions. Unlike the water/DO mixtures, which had a relatively weak water–DO interaction, the strong water–DMSO interaction largely restricted the ability of DMSO to solvate the UAA chain, which resulted in an increase in the aggregation of the hydrophobic segment and the hydrophilic/hydrophobic microphase separation. Thus, UAASG and UAADG networks showed very different swelling behaviors in the same swelling medium because of the microstructural difference between these gels, which was confirmed by dynamic mechanical measurements. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 608–620, 2001 |
---|---|
Bibliography: | istex:0E35CEC3608934CD8A574270C5548A7B52155147 ark:/67375/WNG-VHV51M6B-H ArticleID:APP40 |
ISSN: | 0021-8995 1097-4628 |
DOI: | 10.1002/1097-4628(20010124)79:4<608::AID-APP40>3.0.CO;2-7 |