Towards chiral polystyrene based materials: controlled polymerization of p-(2,2′-diphenylethyl)styrene
Literature Information
Publication Date
2010-01-21
DOI
10.1039/B9PY00286C
Impact Factor
5.582
Authors
Christiane Hohberger, Klaus Beckerle, Jun Okuda
View Original
Abstract
p-(2,2′-Diphenylethyl)styrene (DPES) was polymerized in an atactic, syndiotactic, and isospecific fashion. Atactic polymerization was initiated by 2,2′-azobis(2-methylpropionitrile) (AIBN). Syndiotactic polymer was obtained using the catalyst system TiCp*Cl3/MAO. Isospecific polymerization was performed with the homochiral postmetallocene catalystdichloro{trans-1,2-dithiocyclohexanediyl-2,2′-bis(4,6-di-tert-butylphenolato)}titanium/MAO. Optically active isotactic polymers were obtained by a controlled reduction of the molecular weight, employing two different chain transfer methodologies. In addition to 1-hexene as a chain transfer agent (CTA), the use of diethylzinc as a CTA for DPES oligomerization was introduced. Polymers with molecular weights below Mn of 50,000 g mol−1 showed specific rotation values ([α]23D) between ±0.2 and 2.2.
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Source Journal
Polymer Chemistry
CiteScore:
8.6
Self-citation Rate:
7.3%
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Recommended Compounds
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CAS Number:
1595319-98-4
Molecular Formula:
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CAS Number:
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