Metathesis (co)polymerization reactions of cycloolefins induced by bimetallic tungsten complexes

Postgraduate Thesis uoadl:1316221 266 Read counter

Unit:
Κατεύθυνση Ομογενής Κατάλυση
Library of the School of Science
Deposit date:
2015-07-29
Year:
2015
Author:
Κυριάκου Κατερίνα
Supervisors info:
Πατρίνα Παρασκευοπούλου - Επικ. Καθηγήτρια ΕΚΠΑ
Original Title:
Αντιδράσεις μεταθετικού (ΣΥΜ) πολυμερισμού κυκλοολεφινών με διμεταλλικά σύμπλοκα του βολφραμίου
Languages:
Greek
Translated title:
Metathesis (co)polymerization reactions of cycloolefins induced by bimetallic tungsten complexes
Summary:
In the present study the copolymerization of norbornene (NBE) and norbornadiene
(NBD), induced by compound Na[W2Cl7(THF)2]•(THF)3, is reported. This bimetallic
complex features a W–W bond of order 2.5 ({W 2.5 W}7+, a΄2e΄3). The reactions
are carried out at room temperature. Most of the copolymers obtained are
insoluble in common organic solvents. The polymers obtained have been
characterized by spectroscopic methods (1H NMR), thermal analysis (TGA, DSC),
viscometry and size exclusion chromatography (SEC).
The reactions of [W2Cl4(OCH3)4(CH3OH)2] with a number of cycloolefins have also
been studied. This complex features a W–W bond of order 2 ({W 2 W}8+, a΄2e΄2).
It is catalytically active towards the ring opening metathesis polymerization
(ROMP) of norbornadiene (NBD), while it is inactive towards the polymerization
of norbornene (NBE) and 5-vinyl-2-norbornene (VNBE). The homopolymers obtained
cross-linked and therefore insoluble in common organic solvents.
Keywords:
Ring Opening Metathesis Polymerization (ROMP), Tungsten, Metal-metal bonds, Polymeric materials, Catalysis
Index:
Yes
Number of index pages:
3-11
Contains images:
Yes
Number of references:
139
Number of pages:
100
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