Effect of polymerization time on the molecular weight and molecular weight distribution of polypropylene

作者：S. Abedi, Mehdi Hosseinzadeh, Mehdi Kazemzadeh, Majid Daftari‐Besheli · 发表于：Journal of Applied Polymer Science · 年份：2006 · DOI：10.1002/app.23123 · 被引用次数：10 · 研究领域：biodegradable polymer synthesis and properties、Organometallic Complex Synthesis and Catalysis、Polymer crystallization and properties

Abstract The influence of the polymerization time on the molecular weight ( M w , M n , M p , and M z ), molecular weight distribution (MWD) and relative MWD of polypropylene (PP) in the propylene polymerization with a Mg(OEt) 2 /DIBP/TiCl 4 /PTES/AlEt 3 catalyst system in the slurry phase has been studied by using gel permeation chromatography (GPC), where Mg(OEt) 2, DIBP (diisobutyl phthalate), TiCl 4 , PTES (phenyl triethoxy silane), and triethyl aluminum (TEA) are support, internal donor, catalyst, external donor, and cocatalyst, respectively. It has been found that the increase of the polymerization time increases the molecular weight and MWD of PP. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 368–371, 2006