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Study Onthe Influence of External Electronic Body on Olefin Bulk Polymerization

Author: LiangHongYan
Tutor: LiHuiPing；GuanMin
School: Xinjiang University
Course: Chemical Engineering and Technology
Keywords: Bulk polymerization External electron donor Isotacticity Drag reduction rate
CLC: O631.5
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 1
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Abstract


Currently, oil-soluble drag reducing agent in the oil pipeline supported by a wide range of applications , it is highly flexible linear polymer having a high molecular weight olefin homo-or copolymer . Oil-soluble drag reducing agent in the oil transportation process , can reduce the frictional resistance of the pipe , thus saving a lot of cost . The experimental group has been different polymerization methods in the study of the polymerization , the conclusions obtained by solution polymerization can be obtained a higher drag reduction rate of the polymer , but the resulting polymer is required to add post-processing use . The bulk polymerization advantage of high purity, without the need for subsequent processing of the product and media separation and medium recovery process operation using relatively simple equipment . However, the bulk polymer drag reduction rate is relatively low . In order to improve the ability of the catalyst activity and stereospecificity , are usually added in the Ziegler-Natta catalyst system the external electron donor . When the external electron donor procatalyst , cocatalyst matching obtained at that time , can improve the performance of the catalyst . The present study aimed bulk polymerization process , a different kind of external electron donor polymer . Select diphenyl dimethoxy silane , methyl benzoate , and tetrahydrofuran as an electron donor . Through experiment that , in 200 mL of the main body in the polymerization system , the main catalyst 0.16 g ; the cocatalysts 1.6 mL ; tetrahydrofuran : 0.08 mL ; feed temperature of 0 ° C ; 35 min under the conditions of the reaction time , the maximum drag reduction rate of the polymer can be achieved about 40%. In addition , in the bulk polymerization catalyst TiCl 4 - based outside to the electron donor the MgCl 2 < / sub > polymer drag reduction rate from 20% to 32.8% . Infrared spectroscopy , nuclear magnetic resonance , X -ray diffraction and Soxhlet extraction is carried out on the resulting polymer analysis, the outer electron donor Add isotacticity of the polymer and the yield can be improved .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > Polymerization,polycondensation reaction
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