The synthesis and polymerization of oxo-crown ethers

Acta Polymerica

Volumn 47, Issue 11-12, 1996, Pages 485-491

  Peelers, E ^a   Janssen, U M ^a   Van Zundert, M F ^a   Van Genderen, M H P ^a   Meijer, E W ^a  

^a EINDHOVEN UNIVERSITY OF TECHNOLOGY   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; CESIUM COMPOUNDS; HEATING; MOLECULAR WEIGHT; MOLECULAR WEIGHT DISTRIBUTION; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; POLYMERIZATION; POLYMERS; SALTS; SYNTHESIS (CHEMICAL); THERMAL EFFECTS;

CYCLIZATION; DISPERSITIES; HYDROXYCARBOXYLIC ACID; LEWIS ACID CATALYST; MONOMER CATALYST RATIO; OXO CROWN ETHERS; TEMPLATE SALT;

CROWN ETHERS;

EID: 0030291235     PISSN: 03237648     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

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36. A second explanation in accordance with the observed behavior is the following. Initiation and propagation take place via a coordination polymerization mechanism, see Ref. [16] (the SnOct2-catalyst is attached to one end of the oligomer). However, detachment of the catalyst from the polymer-end takes place at a speed comparable to the speed of initiation and propagation. This will result in short oligomers (typically 3 monomers in length) that can polymerize via polycondensation (giving longer oligomers of 6 monomers in length). If the speed of polycondensation is lower than the speed of initiation and propagation, these short oligomers will accumulate. Moreover, oligomers of 4 and 5 monomers in length will be statistically 'absent'. Polycondensations of compounds 8 a and 8b gave polymers with molecular weights of A/n = 7.9 kg/mol and A/n = 4.9 kg/mol and dispersities of 2.0 and 1.7, respectively. The results of these simple polycondensations do not differ enormously from the results of the SnOct2-catalyzed polymerizations of the oxo-crown ethers 1 and 2
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