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2-Handouts_HO-11 - exceeds the number of polymer chains...

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CHEM 537 Related Materials 11 Comparison: addition versus Condensation Chain-Growth reaction***Chain Kinetics***Addition Polymerization Step-Growth reaction***Stepwise Kinetics***Condensation Polymerization I + A A I A A I A A A A Live Live Dead 1650 units per 1.24 s at 100 o C coupling termination I HO 2 C A CO 2 H HO 2 C A CO 2 B OH HO 2 C A CO 2 B O 2 C A CO 2 H HO 2 C A CO 2 B O 2 C A CO 2 B OH A'B'A'B' B'A'B'A' A'B'A'B'A'B'A'B' Live Live Live HO 2 C A CO 2 H HO B OH SLOW HO B OH + Repeat unit: Same number of atoms as monomer(s) A'-B' fewer atoms than the monomers (backbone has atoms of more than one element) E a : 2-5 kcal/mol E a : 30-60 kcal/mol Percent monomer reacted increases slowly (Number of unreacted monomer far
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Unformatted text preview: exceeds the number of polymer chains until very high conversions). ▒ Percent monomer reacted increases rapidly (after a while no monomer molecule left). ▓ Average chain length (M or DP) remains constant throughout. (maximum chain length attained very rapidly…dead polymer). ▒ Average chain length (M or DP) changes with time. (polymer always alive) DP Time addition polymerization DP Time condensation polymerization W f addition polymerization W f T 1 T 2 T 3 condensation polymerization T = time DP DP...
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