Lecture17 - EMA 6165 Polymer Physics AB Brennan EMA 6165...

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Unformatted text preview: EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 1 EMA 6165 - Polymer Physics EMA 6165 - Polymer Physics Dr. Anthony Brennan University of Florida Department of Materials Science & Engineering Polymer Solubility Lecture 17 EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 2 Agenda Agenda Introduction Free Energy of Mixing Entropic Contributions Enthalpic Contributions Cohesive Energy Density Solubility Parameter Polymer/Polymer Solubility EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 3 Estimating Solubility Parameters Estimating Solubility Parameters Q m m m o o s =- 1 1 Where m = mass s = density of solvent EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 4 Recall that G X m ix i = G m ix = ( 29 RT ln 1 1 1 2 2 1 2 2- + - + x Partial Molar Free Energy of Mixing Where X is the number of chain segments or mers. EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 5 Osmotic Pressure by definition: = - G 1 Volume fraction = - RT V 1 ( 29 [ ln 1 2- + 1 1 2 1 2 2- + x Molar volume of solvent x = # of segments Chi Parameter EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 6 Lets tie all of these parameters together. ( 29 ( 29 G x mix i P T = , i = Change in Chemical Potential Where are the critical points? i.e. how does G mix x i EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 7 Osmometry Osmometry Osmotic pressure: arises due to concentration gradients i.e. chemical potential: solvent solute G X mix i = G 1 = ( 29 RT ln 1 1 1 2 2 1 2 2- + - + x EMA 6165 Polymer Physics AB Brennan EMA 6165 Polymer Physics AB Brennan 8 By definition: = - G 1 Thus, ( 29...
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This note was uploaded on 07/20/2011 for the course EMA 6165 taught by Professor Brennan during the Spring '08 term at University of Florida.

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Lecture17 - EMA 6165 Polymer Physics AB Brennan EMA 6165...

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