Towards chiral polystyrene based materials: controlled polymerization of p-(2,2′-diphenylethyl)styrene
作者： Christiane Hohberger , Klaus Beckerle , Jun Okuda
DOI: 10.1039/B9PY00286C
关键词: Tacticity 、 Polymer chemistry 、 Polymer 、 Transfer agent 、 Polymerization 、 Chain transfer 、 Polystyrene 、 Materials science 、 Diethylzinc 、 Styrene
摘要: p-(2,2′-Diphenylethyl)styrene (DPES) was polymerized in an atactic, syndiotactic, and isospecific fashion. Atactic polymerization initiated by 2,2′-azobis(2-methylpropionitrile) (AIBN). Syndiotactic polymer obtained using the catalyst system TiCp*Cl3/MAO. Isospecific performed with homochiral postmetallocene dichloro{trans-1,2-dithiocyclohexanediyl-2,2′-bis(4,6-di-tert-butylphenolato)}titanium/MAO. Optically active isotactic polymers were a controlled reduction of molecular weight, employing two different chain transfer methodologies. In addition to 1-hexene as agent (CTA), use diethylzinc CTA for DPES oligomerization introduced. Polymers weights below Mn 50,000 g mol−1 showed specific rotation values ([α]23D) between ±0.2 2.2.
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