Article
  • The Effect of Internal and External Lewis Bases in the Polymerization of Propylene over MgCl2 Supported Catalysts Prepared by Precipitation Method
  • Park HM, Lee WY
  • 침전법에 의해 제조된 MgCl2 담지 촉매에 의한 프로필렌 중합에서 내부/외부 Lewis 염기 조합의 영향
  • 박홍만, 이화영
Abstract
The effects of internal and external donors on the polymerization of propylene have been investigated with MgCl2 supported catalysts with or without internal electron donor. The internal electron donors used in this study were ethyl benzoate(EB) and di-n-butyl-phthalate(DNBP), and the extemal donors were ethyl benzoate(EB), methyl-t-butyl ether(MTBE) and dimethyl phthalate(DMP). Kinetic curves for propylene polymerization and I. I. of Polypropylene were obtained with variation of external donors; EB, MTBE, DMP. In the absence of the internal electron donor, the catalyst combined with DMP showed a best catalytic performance. MTBE was the best effective for I. I. of the polypropylene and the effect of EB and DMP were almost same. The pair of DNBP (an internal electron donor) and EB (an external electron donor) showed the best catalytic performance.

침전법으로 제조한 촉매에 있어서 내부, 외부 루이스 염기의 조합에 따른 프로필렌 중합 특성과 촉매계의 특성을 알아보기 위하여 내부 루이스 염기가 없는 촉매, 내부 루이스 염기가 ethyl benzoate(EB), di-n-butyl phthalate(DNBP)인 촉매를 각각 침전법으로 제조하고 ethylbenzoate, methyl t-butyl ether(MTBE), dimethyl phthalate(DMP)를 외부 루이스 염 기로 사용하여 프로필렌을 중합하였다. 첨가하는 외부 루이스 염기의 양을 변화시켜 가면서 반응속도 곡선(kinetic curve)과 촉매의 활성 및 폴리프로필렌의 I.I.(isotactic index)를 구하였다. 내부 루이스 염기가 없는 촉매에서는 외부 루이스 염기로 MTBE를 사용한 촉매계의 성능이 가장 좋았고, 여러 가지 내부, 외부 루이스 염기 조합중에서 내부 루이스 염기로 DNBP를 사용하고 외부 루이스 염기로 EB를 사용한 촉매계의 성능이 가장 좋았다.

Keywords: precipitation method; internal donor; external donor; I.I. (Isotactic Index)

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1994; 18(6): 914-921

    Published online Nov 25, 1994