침전법으로 합성된 MgCl₂/THF/TiCl₄ 촉매에 의한 에틸렌의 중합에서 수소의 영향에 관한 연구 The influenence of hydrogen on the polymerization of ethylene with a precipitate MgCl2/THF/TiCl4 catalyst

Highy active catalyst has been prepared by the reaction of MgCl2 with TiCl4 in THF, followed by precipitation in excess amount of n-hexane. Quantitative and qualitative analyses of the catalyst was performed by the combination of the methods such as spectrophotometry, atomic absorption, titration, and gas chromatrgraphy. This catalyst was tested for ethylene polymerization in the presence of AlEt2 with or without the addition of hydrogen. In this process the feasible reduction reaction could be proposed. The activity of the catalyst was lowered by the addition of hydrogen, while the initial activation of Ti sites was accelerated by the increase of the partial pressure of hydrogen. This phenomena were interpreted qualitatively on the basis of simple model. The change in the morphology of nascent polyethylene with the polymerization time was also studied. The speed of disintegration into subparticles and the pattern of polymer growth around the subparticles were considerably different with or without the addition of hydrogen. The change in the molecular weight with the polymerization time was also studied by GPC and viscometry method.
Publisher
한국고분자학회
Issue Date
1990-12
Language
KOR
Citation

폴리머, v.14, no.6, pp.653 - 663

ISSN
0379-153X
URI
http://hdl.handle.net/10203/57604
Appears in Collection
CBE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
  • Hit : 181
  • Download : 0
  • Cited 0 times in thomson ci

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0