Abstract
The ABA-type block copolymer and the random cooligomer composed of a hydrophilic monomer, 2-hydroxyethyl methacrylate (HEMA), and a hydrophobic monomer, styrene (St), were synthesized to study the influence of the hydrophilic and the hydrophobic block chains on the polymer properties in dilute solution. Viscometric measurements were carried out at various temperatures in two solvent mixtures composed of N, N-dimethylformamide (DMF) or ethanol and dioxane which had preferential affinity to one of the block chains. It was found by viscometric measurements that the solution behavior of the ABA-type block copolymer containing a 0.394-mol fraction of HEMA was remarkably different from that of the random cooligomer of the same composition. That is, in each polymer system, the viscosity curves showed maximum values at an optimum composition of the solvent mixture. The peak for the block copolymer, however, shifted to the DMF- or ethanol-rich composition at any one temperature in comparison with that for the random cooligomer. The shift of the peak became large with decreasing temperature. In DMF— dioxane system, especially, the intrinsic viscosity vs. solvent composition curve displayed a cusp at about 0.4-vol fraction of dioxane, suggesting that a conformational transition took place within the block copolymer chain. The cusp smoothed out with decreasing temperature, and changed into a maximum appearing at about 0.2-vol fraction of dioxane.
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Okano, T., Ikemi, M. & Shinohara, I. The Viscosity Behavior of ABA-Type Block Copolymer Composed of 2-Hydroxyethyl Methacrylate and Styrene in Organic Solvent Mixture. Polym J 10, 477–484 (1978). https://doi.org/10.1295/polymj.10.477
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DOI: https://doi.org/10.1295/polymj.10.477