Article
  • Preparation and Properties of Crystalline Polystyrene : Ⅱ. Effects of Polymerization Conditions
  • Lee DH, Noh SK, Yoon KB, Lee EH, Koo SY
  • 결정성 폴리스티렌의 제조 및 성질 : Ⅱ. 중합 조건의 영향
  • 이동호, 노석균, 윤근병, 이억형, 구승영
Abstract
For styrene polymerization initiated by using a half-sandwich titanocene catalyst such as cyclopentadienyltitanium trichloride (CpTiC13), indenyltitanium trichloride (IndTIC13) or pentamethylcyclopentadienyltitanium trichloride(Cp*TiCl3) with modified methylaluminoxane (MMAO) cocatalyst, the effects of polymerization conditions on polymerization behavior and properties of polystyrene were examined. With increasing MMAO concentrations, the catalyst activity increased and the ㏖ecular weight (MW) of polystyrene (PS) decreased. The catalyst activity of Cp*TiC13 increased up to 80℃, while CpTiC13 and IndTiC13 gave maximum catalyst activity at 30 and 40℃. MW and syndiotactic index (SI) of PS decreased with increasing polymerization temperature. The polydispersity of PS was less dependent on polymerization conditions. By increasing styrene concentration, the catalyst activity and MW of PS increased. For IndTiCl3, the catalyst activity and MW of PS were promoted with a short aging time. Irrespective to polymerization conditions, Cp*TiCl3 gave high catalyst activity and the obtained PS had high SI, MW, and melting temperature.

Keywords: syndiotactic polystyrene; titanocenes; CpTiCl3; IndTiCl3; polymerization conditions

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1996; 20(3): 470-475

    Published online May 25, 1996

  • 10.7317/pk.
  • Received on Nov 30, -0001
  • Revised on Nov 30, -0001
  • Accepted on Nov 30, -0001

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