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What is the Flory chi parameter? What are typical values for polymer solutions? What is the...

What is the Flory chi parameter? What are typical values for polymer solutions? What is the theoretical maximum value for a stable solution for a high molecular weight polymer?

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Expert Solution

Chi(χ) paramter is exchange interaction parameter in their lattice model of polymer solutions which helps many thermodynamic properties of polymer solutions such as solubility / miscibility, swelling equilibria, and other properties to be expressed in its terms.

Its typical values for polymer solution i.e. the χ∞ parameter has a value between 0.45 and 0.50 as follows

POLYMER-SOLVENT INTERACTION PARAMETER
AT INFINITE DILUTION (1)

Polymer Solvent χ∞ Poly(acrylamide) Water 0.495 Poly(dimethyl siloxane) 2-butanone 0.500 Polyisobutylene n-Pentane 0.480 Poly(methyl methacrylate) Acetone 0.480 Poly(p-chlorostyrene) Toluene 0.475 Polystyrene Cyclohexane 0.509 Polystyrene Benzene 0.465 Poly(vinyl alcohol) Water 0.494

Theoretical maximum value for high molecular weight polymer can be 0.5 at infinite dilution

queen_honey_blossom answered 2 years ago
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