Poly[2,2-dimethyl-4-(methoxylcarbonyl) butylene]: Synthesis with an ethylaluminum sesquichloride–peroxide initiator and NMR characterization |
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Authors: | I Kuntz N F Chamberlain F J Stehling |
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Abstract: | The alternating copolymer of isobutylene and methyl acrylate (the polymer of the title) has been obtained by using ethylaluminum sesquichloride (AlEt1.5Cl1.5) and 2-methylpentanoyl peroxide as the initiating system in benzene solution. The alternating copolymer is obtained at an acrylate/Al molar ratio of 17. Higher ratios increase the level of acrylate residues in the copolymer isolated; in the absence of AlEt1.5Cl1.5, an equal molar feed gives a copolymer with 75 mole % acrylate units. 1H- and 13C-NMR spectra have been used to study the details of polymer structure and support the equal molar, alternating nature of the macromolecule. The details of the methoxy and gem-dimethyl peaks in the PMR spectra are consistent with a Bernoullian process determining the polymer configurational sequences, with Pm = 0.55–0.60. |
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