TY - JOUR
T1 - Effect of cation local structure on the physical properties of sulphonated polyurethane ionomers based on toluene diisocyanate
AU - Ding, Y. Samuel
AU - Register, Richard Alan
AU - Yang, Chang zheng
AU - Cooper, Stuart L.
PY - 1989/1/1
Y1 - 1989/1/1
N2 - A series of sulphonated polyurethane ionomers based on poly(tetramethylene oxide) of molecular weight 1000, neutralized with Ca2+, Ni2+, Zn2+, Cd2+, Cs+ and Eu3+ were examined by extended X-ray absorption fine structure (EXAFS) spectroscopy. The degree of local order shown by EXAFS correlates inversely with the strain at which stress crystallization begins, indicating that the cohesiveness of the ionic aggregates controls the large-strain behaviour of the materials by suppressing ion-hopping. Upon hydration, the materials lose their mechanical strength. The local structure in the Ca2+-neutralized material is insensitive to hydration, while that in the Ni2+-neutralized material changes dramatically.
AB - A series of sulphonated polyurethane ionomers based on poly(tetramethylene oxide) of molecular weight 1000, neutralized with Ca2+, Ni2+, Zn2+, Cd2+, Cs+ and Eu3+ were examined by extended X-ray absorption fine structure (EXAFS) spectroscopy. The degree of local order shown by EXAFS correlates inversely with the strain at which stress crystallization begins, indicating that the cohesiveness of the ionic aggregates controls the large-strain behaviour of the materials by suppressing ion-hopping. Upon hydration, the materials lose their mechanical strength. The local structure in the Ca2+-neutralized material is insensitive to hydration, while that in the Ni2+-neutralized material changes dramatically.
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U2 - 10.1016/0032-3861(89)90039-6
DO - 10.1016/0032-3861(89)90039-6
M3 - Article
AN - SCOPUS:0024690286
VL - 30
SP - 1221
EP - 1226
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 7
ER -