Chem 115 Lecture_22 - CHM 115 Lecture 22, Polymers 11/9/07...

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Lab: Models of the Solid State Exam 3: Wed., 11/14, 8:30 pm, Lecture 15 - 22, LO, RA, HW 9-12, Lab to last week. CHM 115 Lecture 22, Polymers 11/9/07
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Polymer Properties Polymer properties determined by structure: linear, branching, cross linking side chains intermolecular forces H - bonding Dipole-dipole attractions London forces Ion-Dipole attractions
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Blowing polymer film
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Measuring polymer properties _____________________________________: n avg , the average number of polymer units in a polymer molecule (chain). _____________________________ M polymer = M repeat unit x n chain Number average molar mass: M n , from colligative properties total mass of all chains moles of chains _______________________________: n x length of repeat unit = n x l or N avg x l o M n =
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Measuring polymer properties __________________________, R g : the average squared distance from the edge of a polymer molecule to its centre of gravity. By light scattering experiments . R g = ( n avg l o 2 /6) 1/2
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Average polymer properties Colligative properties give average value, _________________ Π = (moles chains/V)RT moles chains M n = mass polymer / moles chains M n = n avg x M monomer ___________ R g from light scattering gives average value, n avg R g = ( n avg l o 2 /6) 1/2 __________ l avg = n avg x l o M chain = n chain x M monomer
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This note was uploaded on 04/07/2008 for the course CHEM 115 taught by Professor L during the Spring '02 term at Purdue University-West Lafayette.

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Chem 115 Lecture_22 - CHM 115 Lecture 22, Polymers 11/9/07...

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