CHEM 4214 Lecture Notes - Lecture 9: Living Polymerization, Molar Mass Distribution, Chain Transfer
Document Summary
C + d = 1 since they"re equally likely, to happen, c = d = 1/2. Narrow distribution d --> 1 want narrow distribution so that we can have 1:1 correspondence btwn molecular weight and polymer properties. Large-scale production of block-copolymer, branched polymer, end-functionalized polymer. -> motivates research in recombinant dna technology (60s and 80s) -> living polymerization living = chain growth in absence of irreversible transfer or termination. 3 main categories anionic, cationic, radical for both ionic (imagine replacing free radical w/ ion) -> have all chains begin to grow at the same time. [m]0 = # monomers we start with above eqn is under assumption that rxn goes to completion. At t = 0, [pi*] = [i]0 simple 1st order diff eq. At any t, replace m with solution from diff eq kinetic chain length when let t --> infinity, exponential term goes away and then kinetic chain length = degree of polymerization.
