NMR study of poly‐p‐isopropyl‐α‐methylstyrene

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Abstract
220 MHz NMR spectra of sample of poly‐p‐isopropyl‐α‐methylstyrene prepared through anionic (A) and cationic (B) polymerizations are studied. Peaks at τ values of 9.07, 9.41, and 9.71 are assigned to isotactic (i), heterotactic (h), and syndiotactic (s) α‐methyl triads, respectively. From the α‐methyl triads and the β‐proton tetrads it is found that polymer A deviates little from Bernoullian statistics and that first‐order Markov configurational statistics applies to polymer B. Isopropyl methine and methyl proton resonances are also analyzed in terms of the configurational statistics of the polymer. Resonances of the phenyl protons are assigned with increasing field to s, h, i meta and ortho protons.

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