Experimental Method: Determination of : Osmotic Pressure. The osmotic pressure data for cellulose tricaproate in dimethylformamide at three temperatures. The Flory -temperature was determined to be 41 ± 1°C. Modified Flory-Huggins theory. Is temperature dependent.
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The osmotic pressure data for cellulose tricaproate in dimethylformamide at three temperatures. The Flory -temperature was determined to be 41 ± 1°C
Is temperature dependent
Therefore, any temperature which causes =1/2 will
be the Flory temperature
The Chain Expansion Ratio and -Temperature
The Expansion Ratio, r
Often polymers will precipitate
out of solution, rather than contracting
The Solvent Goodness:
Note that the energy terms w11, w22 and w12 are attractive
terms and are usually negative .
When Hmix=0 for a solvent -polymer system, thus w11=w22 and
the cohesive energy density.
Thermodynamics of Mixing
Free Energy of Mixing:
Chemical Potential and Osmotic Pressure:
Other Forms of Flory-Huggins Eqs:
0.35 (in older literature), or zero
a) End-group Analysis
b) Colligative Properties
Size Exclusion Chromatography