The state of a polymer solution for which the second
virial coefficient is zero.
Notes:
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In some respects, a polymer solution in the θ state resembles an ideal solution and
the θ state may be referred to as a pseudo-ideal state. However, a solution in the
θ state must not be identified with an ideal solution.
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The solvent involved is often referred to as 'θ solvent'.
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It is assumed that the molar mass of the polymer is high.
Source: