Abstract
The efficiency of the synthesis of terminally hydroxylated isotactic polypropylene (i-PP) through the oxidation of Al-functionalized i-PP was evaluated and side-reactions are discussed. Al-functionalized i-PP was prepared by chain-transfer reaction by Et3Al with the MgCl2-TiCl4-dioctylphthalate/Et3Al/diphenyldimethoxysilane catalyst. It was oxidized by molecular oxygen and poured into methanol for alcoholysis at chain ends. All chain-end groups of the obtained polymer were identified by 13C NMR and 52 mol% of Al-functionalized chain ends was found converted to hydroxyl groups. 20 mol% vinylidene groups by elimination of β-hydrogen and 8 mol% vinyl groups by elimination of β-methyl groups were detected. 20 mol% of Al-functionalized chain ends remained unreacted. IR analysis of the resulting i-PPs showed the hydroxyl groups at ω-ends to form no hydrogen bond and decrease in reaction time with molecular oxygen to lead to lower conversion to terminally hydroxylated chain ends.
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Kojoh, Si., Tsutsui, T., Kioka, M. et al. Reactivity of Aluminum-Functionalized Isotactic Polypropylene with Molecular Oxygen. Polym J 31, 332–335 (1999). https://doi.org/10.1295/polymj.31.332
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DOI: https://doi.org/10.1295/polymj.31.332