Synthesis of novel electron donors and their appli

Authors: Jintang Guo Guang Hu Zhikun Chen

Publish Date: 2012/01/10

Volume: 18, Issue: 1, Pages: 8-14

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Abstract

A series of electron donors including 11cyclopentanecarboxylic acid diethyl ester CPCADEE 11cyclopentanedimethanol acetic diester CPDMAD 11biethoxymethyl pentane BEMP 22diethyl diethylmalonate DEDEMand 22diethyl13propanediol acetic diester DEPDADE were synthesized by diethyl malonate DEM The purities and structures of the above products were characterized by gas chromatography GC and gas chromatographymass spectrometer GCMS respectively Furthermore the possible optimal threedimensional structures of these donors were simulated by means of Gaussian 03 and Chem 3D Then these electron donors were coordinated with tetrachloro titanium TiCl4 and chloride magnesium MgCl2 to obtain the catalysts for the polymerization of propylene The catalytic activities and properties of polypropylene are greatly improved by adding external donorED when CPCADEE or DEPDADE is used as internal donorID However when BEMP was used as ID the highest catalytic activity is obtained without adding ED which can reduce production costs and simplify catalytic synthesis The experiments indicate that BEMP has the shortest distance of oxygen atoms and the highest electronegativity

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