| 单词 | theta solvent |
| 释义 | > as lemmastheta solvent 4. Chemistry. theta (or θ, Θ) temperature, the temperature of a polymer solution at which it behaves ideally as regards its osmotic pressure; so theta condition, theta solvent, etc. ΘΚΠ the world > matter > chemistry > physical chemistry > solvents and solutes > [noun] protophile1930 theta solvent1953 the world > matter > chemistry > polymer chemistry > polymers (assoc. miscellaneous) > [noun] > theta temperature theta (or θ, Θ) temperature1953 1953 P. J. Flory Princ. Polymer Chem. xii. 523 Frequently it is preferred to use as a parameter the ‘ideal’ temperature Θ... At the temperature T = Θ, the chemical potential due to segment-solvent interactions is zero... Hence the temperature Θ is that at which the excess chemical potential is zero and deviations from ideality vanish. 1953 P. J. Flory Princ. Polymer Chem. xiv. 612 An ideal solvent, or Θ-solvent. 1953 P. J. Flory Princ. Polymer Chem. xiv. 612 The intrinsic viscosity usually changes rapidly with temperature in the vicinity of the Θ-point. 1966 Brandrup & Immergut Polymer Handbk. iv. 163 Theta-solvents (θ-solvents) are solvents in which, at a given temperature, a polymer molecule is in the so-called theta-state, where it behaves like an ideal statistical coil. 1973 J. M. G. Cowie Polymers vii. 138 Above the theta temperature expansion of the coil takes place, caused by interactions with the solvent, whereas below Θ the polymer segments attract one another, the excluded volume is negative, and eventual phase separation occurs. 1974 Sci. Amer. Dec. 60/2 At that temperature, which varies for different polymers and solvents, the measured properties of the polymer can be usefully compared with those of other polymers at their theta temperature. < as lemmas |
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