CHEM 4214 Lecture Notes - Lecture 41: Scattering, Polypropylene, Size-Exclusion Chromatography
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Mn, mw, d >=1: structure linear and branch structural isomerism tacticity: ziegler-natta living polymerization can help control this. A-b (2 functional groups in same monomer) abababab A-a + b-b . aabbaabbaabb . (can"t guarantee here that we have same # of a and b groups) when r = 1, have to go to high extent of rxn to get higher mw . step growth gives lower mw polymer. D = 1 + p as p 1, d = 2 broad distribution . *find what narrow distribution is slow kinetics wide variety of monomers we can use (heterogeneous backbones) polyester, polyamide (nylon) *know the polymers on the memorization sheet: chain growth free radical polymerization. Copolymerization eqn fraction of a group in chain = f1 = fraction of a group in solution. , <1, <<1 tells us whether 1 prefers to add itself or add 2 r2. Ziegler-natta method for polymerizing polypropylene this was our first midterm afterwards, talked about polymer physics.
