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Ring opening metathesis polymerization of cyclic olefins catalyzed by a ruthenium complex immobilized on carbon nanotube

Grant number: 12/05608-4
Support type:Scholarships in Brazil - Master
Effective date (Start): June 01, 2012
Effective date (End): April 30, 2014
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Benedito dos Santos Lima Neto
Grantee:Mayara Conrado Sartori
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The project aims toimmobilize the complex [RuCl2 (PPh3) 3] in the array of carbon nanotube (CNT), ín a way that it is employed in reactions of ROMP (ring opening metathesis polymerization). The reactions will be tested with norbornene and norbornadiene in solutions of CHCl3 at room temperature and 50 ° C, on time intervals from 5 to 60 min and compared with systems in homogeneous phase. The initiator [RuCl2(PPh3)3] willl be fixed by the substituted ligand piperidine (HOCH2-piperidine) that will be covalently linked to CNT derived by organic chain previously synthesized.Thus, this project is part of the development of heterogenized initiators in order to allow the reuse of catalysts, within the boundaries of technology transfer. The recovery of the catalyst will be tested using a pulsed methodology with chain transfer agent (CTA) cis-stilbene, ROMP-CTA-ROMP-CTA ... etc.. At each cycle ROMP-CTA , the polymer is decanted, and then a new cycle can be started. Within this development, will be checked the effectiveness of the immobilized initiator in order to improve problems with interaction substrate/iniciator within the solution, considering that this is a polymerization reaction. Problems of deactivation, leaching and diffusion will be observed, so they can be minimized by using a pulsed-ROMP appropriate CTA.

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SARTORI, Mayara Conrado. Polymerization via ring opening methatesis of ciclic olefins catalysed by ruthenium complex immobilized in carbon nanotubes. 2014. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Química de São Carlos São Carlos.

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