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Titanium complexes: A possible catalyst for controlled radical polymerization

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Abstract

Pentamethylcyclopentadienyltitanium trichloride, bis(cyclopentadienyl)titanium dichloride (Cp2TiCl2), and bis(pentamethylcyclopentadienyl)titanium dichloride were used in the polymerization of styrene without the aid of Group I–III cocatalysts. The properties of the resulting polymer indicated that polymerization was more controlled than in thermal polymerization. The kinetic studies indicated that a lower level of termination is present and that the polymer chain can be extended by adding an additional monomer. To elucidate the mechanism of polymerization, a series of experiments was performed. All results supported the involvement of a radical mechanism in the polymerization using Cp2TiCl2. The possibility of atom transfer radical polymerization (ATRP) mechanism was investigated by isolating the intermediate species. We could confirm the activation step from the reaction of 1-PECl with Cp2TiCl by detecting the coupling product of the generated active radicals. However, the reversible deactivation reaction competes with other side reactions, and it detection was difficult with our model system.

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Authors and Affiliations

  1. Department of Textile Engineering, Soongsil University, 156-743, Seoul, Korea

    Young-Je Kwark

  2. Kolon Industries, Inc., 446-797, Yongin, Korea

    Jeonghan Kim

  3. Department of Chemistry, North Carolina State University, 27612, Raleigh, NC, USA

    Bruce M. Novak

Authors
  1. Young-Je Kwark
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  2. Jeonghan Kim
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  3. Bruce M. Novak
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Correspondence to Young-Je Kwark.

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Kwark, YJ., Kim, J. & Novak, B.M. Titanium complexes: A possible catalyst for controlled radical polymerization. Macromol. Res. 15, 31–38 (2007). https://doi.org/10.1007/BF03218749

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  • DOI: https://doi.org/10.1007/BF03218749

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