Statistical and block copolymers of Norbornene and Cyclopentene with ring opening metathesis polymerization using Grubbs catalysts 1st and 2nd generation

Postgraduate Thesis uoadl:1319750 332 Read counter

Unit:
Κατεύθυνση Επιστήμη Πολυμερών και Εφαρμογές της
Library of the School of Science
Deposit date:
2014-09-10
Year:
2014
Author:
Μαρούδας Ανδρέας-Φίλιππος
Supervisors info:
Πιτσικάλης Μαρίνος Αναπλ. Καθηγητής ΕΚΠΑ (Επιβλέπων), Ερμόλαος Ιατρού Αναπλ. Καθηγητής ΕΚΠΑ, Πατρίνα Παρασκευοπούλου Λέκτορας ΕΚΠΑ
Original Title:
Στατιστικά και κατά συστάδες συμπολυμερή νορβορνενίου και κυκλοπεντενίου με μεταθετικό πολυμερισμό διάνοιξης δακτυλίου χρησιμοποιώντας καταλύτες Grubbs 1ης και 2ης γενιάς
Languages:
Greek
Translated title:
Statistical and block copolymers of Norbornene and Cyclopentene with ring opening metathesis polymerization using Grubbs catalysts 1st and 2nd generation
Summary:
A series of copolymerizations of bicycle[2,2,1]hept-2-ene (norbornene) with
cyclopentene were performed using Grubbs type catalyst (1st and 2nd
generation). The effort was focused towards obtaining the reactivity ratios of
these two monomers and understanding their role in ring opening metathesis
polymerizations. The reactivity ratios were estimated using the Finemann-Ross,
inverted Finemann-Ross and Kelen-Tudos graphical methods. Structural parameters
of the copolymers were obtained by calculating the dyad sequence fractions and
the mean sequence length, which were derived using the monomer reactivity
ratios.
By simultaneously adding these monomers statistical copolymers of norbornene
(NBE) with cyclopentene (CPE), PNBE-co-PCPE, were prepared by ring-opening
metathesis polymerization, employing the 1st generation Grubb’s catalyst. The
polymerization is immedietly terminated in order to apply Kelen-Tudos graphical
methods. Moreover, different molar ratios of the monomers were sequentially
added to synthesize diblocks of PNBE-b-PCPE and a final attempt was made to
synthesize pseudo-diblocks of PCPE-b-PNBE, where the monomers were
simultaneously added to the flask containing the Grubbs catalyst and the
polymerization was terminated after a certain period of time.
Experiments were also conducted in the presence of PPh3. The same monomer
ratios of CPE:NBE were applied and each time an amount of PPh3 was added to
the Grubbs catalyst and dissolved to distilled dichlomethane. The molar ratio
of added triphenylphosphine (PPh3) to the initiator was constantly 4:1. The
termination, precipitation and purification procedures were the same as
previously reported.
Keywords:
Norbornene, Cyclopentene, ROMP, Statistical Copolymers, Triphenylphosphine
Index:
Yes
Number of index pages:
10
Contains images:
Yes
Number of references:
75
Number of pages:
120
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