Dimethylsulfoxide (DMSO) solutions of schizophyllan were diluted with water to a series of wH (the water weight fraction in the mixed solvent), and the subsequent changes in viscosity were measured as a function of wH, polymer concentration c, and time t. As wH was increased, (lnηr)/c at fixed c and t(10 h) remained constant up to wH∼0.13, then underwent a sharp decrease, passed through a deep minimum at wH∼0.25, and increased markedly. The intrinsic viscosities of five schizophyllan samples (ranging in molecular weight from 1.35×104 to 1.5×105) determined at wH=0.25 were essentially independent of molecular weight, being about 8 cm3 g−1. An attempt was made to explain the entire experimental finding as a result of combined effects of two molecular processes: collapse of random coils to globules by intrachain hydrogen bonding and formation of aggregates by interchain hydrogen bonding.
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Sato, T., Sakurai, K., Norisuye, T. et al. Collapse of Randomly Coiled Schizophyllan in Mixtures of Water and Dimethylsulfoxide. Polym J 15, 87–96 (1983). https://doi.org/10.1295/polymj.15.87
- Chain Collapse
- Intrinsic Viscosity
- Intermodular Association
- Intramolecular Association
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