Citation: XU Junting, Feng Linxian, Wang Senhui, Yang Shilin. SUPPORTED CATALYST WITHOUT EXTERNAL ELECTRON DONOR FOR PROPYLENE POLYMERIZATION Ⅱ. TACTICITY DISTRIBUTION AND MICROSTRUCTURE OF POLYPROPYLENE*[J]. Chinese Journal of Polymer Science, ;1998, 16(1): 56-61. shu

SUPPORTED CATALYST WITHOUT EXTERNAL ELECTRON DONOR FOR PROPYLENE POLYMERIZATION Ⅱ. TACTICITY DISTRIBUTION AND MICROSTRUCTURE OF POLYPROPYLENE*

Received Date: 27 March 1997

Propylene was polymerized with a novel supported Ziegler-Natta catalystcontaining 2,2-di-iso-butyl-1,3-dimethoxy-propane (DIBDMP) as internal donor and in theabsence of external donor. The tacticity distribution of polypropylene was obtained by usingtemperature rising elution fractionation (TREF) technique and microstructure of fractionswas studied with 13C-NMR. Compared with the catalyst without electron donor, this cat-alyst gives a considerably narrower tacticity distribution. Fractionation data demonstrate that DIBDMP shows better performance than aromatic diester DNBP (di-n-butyl phthalate).Chemically inverted propylene units and less stereoblockiness are found in the first fraction.Possible reasons for these were presented.
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