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TiCl4/MgCl2/THF 촉매에 의해 중합된 고밀도 폴리에틸렌의 분자량 분포 및 형태 연구

A Study on the Molecular Weight Distribution and Morphology of HDPE Polymerized with TiCl4/MgCl2/THF Catalysts

HWAHAK KONGHAK, April 1989, 27(2), 206-214(9), NONE
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Abstract

THF용매하에서 MgCl4와 TiCl4를 반응시켜 Complex를 형성하고 n-hexane을 가하여 침전시키는 방법으로 고활성 에칠렌 중합촉매를 합성하였다. AlEt3를 cocatalyst로 사용하여 slurry 반응으로 60분동안 에틸렌을 중합하여 중합조건 변화에 따른 수율의 변화를 조사하였다. 평균 분자량과 분자량 분포를 GPC와 점도측정에 의해 측정한 결과 Q=3-11의 좁은 분자량 분포를 갖는 고밀도 폴리에틸렌을 얻을 수 있었다. 단량체의 농도, Al/Ti의 비 그리고 수소농도가 분자량에 미치는 영향을 조사하였다. 수소분압의 1/2승에 비례하여 폴리머 분자량이 감소함을 보였다. 또한 SEM에 의해 얻은 폴리머의 morphology를 조사하였다.
High activity ethylene polymerization catalysts have been prepared by the reaction of magnesium chloride with titanium tetrachloride in terahydrofuran, followed by precipitation with excess n-hexane. The catalysts are tested in ethylene polymerization in the presence of AlEt3 in the slurry reactor. The yields of HDPE during 60min. polymerization at various polymerization conditions were obtained. The average molecular weight and molecular weight distribution have been examined by GPC and viscometry. Narrow molecular weight distributions of Q=3-11 were obtained. The effects of the concentration of monomer, alu-minum alkyls and hydrogen on molecular weight were investigated. The molecular weight of HDPE was found to be inversely proportional to the square root of the partial pressure of hydrogen. The morphologies of HDPE were also studied with SEM at various polymerization conditions.

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