Abstract
Cloud point temperature T clo and dynamic moduli were measured on aqueous solutions of two poly(vinyl methyl ether) (PVME) samples with molecular weight of 1.16×10 4 and 2.57×10 4 , respectively and M w /M n =1.84 for both samples. The T clo at which the solution becomes turbid is at around 32.5°C without obvious molecular weight dependence due to their broad molecular weight distribution. The frequency ω dependence of the storage modulus G' and loss modulus G observed within linear viscoelasticity region indicates that the PVME/water solution exhibits homogeneous fluid behavior at 25°C below T clo , while shows a plateau zone for G' at 34°C above T clo , suggesting the appearance of network structure at this temperature. A sharp increase in G' and G was observed at about 32.5°C with increasing temperature of a PVME/water solution, indicating that at this temperature the network begin to form. These results imply that the network structure is formed accompanying the phase separation in PVME/water solutions due to the hydrophobic bonding between polymer chains.
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