Particle and Aerosol Research Vol. 11, No. 3, September 2015 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Polymerization of Polyethylene Using Bimodal TiCl4/MgCl2/SBA-15/MCM-41
Mattanawadee Moonyakmoon, Sujitra Klinsrisuk and Choosak Poonsawat*
Abstracts
Abstract
MCM-41 (Mobil Composition of Matter) and SBA-15 (Santa Barbara Amorphous) were used as a supported catalyst for ethylene polymerization due to their combination of large surface area and wide range of pore size distribution. The morphology of supports was used to control the morphology of the resulting polymer. Different molar ratios of Al/Ti were used for ethylene polymerization at 60¡É under atmospheric pressure. The effect of different mass ratios of MCM-41/SBA-15 and 1-hexene concentration on polymerization activity and polymer properties was investigated. The catalytic activity and the crystallinity reached the highest value at Al/Ti of 480. Upon incorporation of MCM-41 and SBA-15 into MgCl2/TiCl4 catalyst, the molecular weight and crystallinity of polyethylene were enhanced. The obtained polyethylene showed melting temperature between 130 and 135¡É. The polyethylene with replication structure of support and bimodal MWD was expected.
Keywords£ºEthylene polymerization, MCM-41 and SBA-15, Bimodal MWD, Ziegler-Natta catalyst.
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