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# Test 2 Polymer Notes

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### Test 2 Polymer Notes

1. 1. Begin Chapter 3<br />Osmotic pressure used to find number-average molecular weight<br />Scattered-light intensity used to find weight-average molecular weights<br />Remember isotactic, syndiotactic, atactic<br />Conformation is same as saying chain-orientations. <br />r=nxL (simplest form)<br />r is the distance from origin (0,0) to the end tip of the polymer (end to end distance)<br />n = the number of links (think: kind of like how many links are in an iron-chain/bike chain)<br />L= the equal length of each of those links, each link is the same length and it equals L<br />*there are some probability equations, but I do not see that being on the test, or so I hope*<br />In general to express end to end distance, this formula is used:<br />I think that can be rewritten for simplicity as: <r2>=nl2 <br />Polymer Solutions<br />Solution: any phase containing more than one component (gas, liquid or solid)<br />it was discovered that dilute polymer solutions deviated strongly from idweal-solution behavior.<br />Polymers are studied while in solution for these reasons:<br /><ul><li>size exclusion, chromatography, osmometry, viscosimetry, light scattering, and important measurements such as Molecular weight are discovered WHILE the polymer is IN Solution.
2. 2. Polymers are usually formed while in solution, such as polystyrene</li></ul>Whether or not a polymer and solvent are mutually soluble, or miscible, is governed by the sign of the Gibbs free energy of mixing, (delta Gmix as shown above in equation) if it satisfies the equation above, then the sign will be negative but it isn’t only condition that has to be met for miscibility. Another condition has to be met, and that is located on page 109, equation 3.63 (I don’t get that equation…)<br />*looking at all those graphs on the slideshow (slides 19,20,21,22)…..i don’t have a darn clue what they mean (spinodal, bimodal curve, etc) *<br />Polymer-Solvent Interaction<br /><ul><li>Size of polymer molecule greatly depends on its interaction with the solvent that was used to make it.
3. 3. In good solvents Molecules assume expanded conformations
4. 4. In poor solvents intramolecular interactions become more significant