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|Title:||Polymer networks assembled by host−guest inclusion between adamantyl and β-cyclodextrin substituents on poly(acrylic acid) in aqueous solution|
|Other Titles:||Polymer networks assembled by host-guest inclusion between adamantyl and beta-cyclodextrin substituents on poly(acrylic acid) in aqueous Solution|
|Citation:||Macromolecules, 2008; 41(22):8677-8681|
|Publisher:||Amer Chemical Soc|
|Li Li, Xuhong Guo, Jie Wang, Peng Liu, Robert K. Prud’homme, Bruce L. May and Stephen F. Lincoln|
|Abstract:||Polymer networks have been constructed through host−guest inclusion between β-cyclodextrin (β-CD) and 1-(2-aminoethyl)amidoadmantyl (ADen) substituents on poly(acrylic acid) (PAA). The structure of the networks and the host−guest interactions between the β-CD and ADen groups were studied by rheology and 2D 1H NOESY NMR spectroscopy. The maximum viscosity of the mixture of β-CD substituted PAA (β-CDPAA) and ADen substituted PAA (ADenPAA) occurred at a 1:1 β-CD:ADen substituent ratio which confirmed their binary inclusion. The viscosity of the mixture of the two polymers decreased upon addition of native β-CD due to its ability to compete favorably with the β-CD substituents of β-CDPAA in the inclusion of the ADen substituents of ADenPAA and the consequent disintegration of the polymer network. The rheological properties of the polymer networks were temperature sensitive. In the temperature range 10−35 °C, the storage modulus and the loss modulus obeyed a time−temperature superposition. The horizontal and vertical temperature shift factors, aT and bT, obeyed a simple Arrhenius relationship for which the activation energies were found to be 70.3 ± 0.4 and −2.2 ± 0.1 kJ mol−1, respectively. 2D 1H NOESY NMR studies showed the ADen substituent to be included within the native β-CD and β-CD substituent cavities.|
|Appears in Collections:||Chemistry publications|
Environment Institute publications
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