Notes_section2_polym - Add MMA – get PS-PMMA block copolymer(A-B type(DPE reduces anion nucleophilicity and attack at MMA carbonyl Microstructure

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Section 2 – Polymerization and The Polymer Chain Polymerization (Mechanism controlled) Step-Growth X n = 1/(1-p) Demonstrate Xn vs. p curve X w = (1+p)/(1-p) PDI = X w /X n = 1 + p Chain Growth Initiation, propagation, and termination Living anionic polymerization Demonstrate with PS and BuLi Immediate and simultaneous initiation Propagation of all chains concurrently X n vs p curve is linear (allows molecular weight control) Termination by quenching Telechelics – e.g. reaction with CO2 Block copolymer formation Styryl anion Modify end group by rxn with 1 eq. 1,1-diphenylethene
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Unformatted text preview: Add MMA – get PS-PMMA block copolymer (A-B) type (DPE reduces anion nucleophilicity and attack at MMA carbonyl. Microstructure Linear Long- versus short-chain branching Branched Star-branched Comb branched Randomly branched Hyperbranched Dendrimer Copolymers Alternating Random Block (Diblock, Triblock) Graft Network Formation (Nonlinear Step-Growth Polymerization) Modified Carothers Equation Assume Xn approaches infinity Determination of average functionality p = 2/f av – 2/(X n F av ) p gel = 2/f av...
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This note was uploaded on 05/29/2011 for the course CHM 5511 taught by Professor Graham during the Spring '11 term at University of Florida.

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