Synthesis Of Donor And Its Effect On Performance Of MgCl₂/TiCl₄/ID Catalysts For Propylene Polymerization

This thesis did a careful study on synthesis of a series of donors, including diester, diol diester and diether. Three steps of synthesis to synthesize such donors were applied, and the raw material we used in this study was diethyl malonate. By the result of the GC-MS, we confirmed the feasibility of the synthesis method. Then the donors were combined with TiCl₄ and MgCl₂ to gain MgCl₂/TiCl₄/ID catalysts. Content of Ti and ID were determined by gas chromatograph and ultraviolet spectrum respectively, of which the results show that TiCl₄ and ID were loaded with MgCl₂ successfully. Then we could gain the conclusion from the study of the influence of different internal donors on content of Ti in the catalyst. Generelly speaking, if we take the content of Ti as the weighing standard, the electron donation abilities decreased as the following order: diether2/TiCl₄/ID catalyst while the isotaticity index affects the thermal properties of PP indirectly. We also found that no matter using as internal or external donors, they could take the same effection on propylene polymerization.