Application of ring-opening metathesis polymerization in study of polymer molecular weight-mediated catalytic properties of immobilized lipase

2009 ◽  
Vol 54 (3) ◽  
pp. 382-386 ◽  
Author(s):  
Chuang Du ◽  
Guo Zhang ◽  
Zhi Wang ◽  
Lei Li ◽  
Jun Tang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Catalytic Properties ◽  
Immobilized Lipase ◽  
Polymer Molecular Weight ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization

scholarly journals Molecular Weight Control via Cross Metathesis in Photo‐Redox Mediated Ring‐Opening Metathesis Polymerization

2020 ◽  
Vol 132 (23) ◽  
pp. 9159-9164
Author(s):  
Victoria K. Kensy ◽  
Rachel L. Tritt ◽  
Farihah M. Haque ◽  
Laura M. Murphy ◽  
Daniel B. Knorr ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Weight Control ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
Molecular Weight Control ◽  
Cross Metathesis

Novel unsaturated ε-caprolactone polymerizable by ringopening and ring-opening metathesis mechanisms

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Xudong Lou ◽  
Christophe Detrembleur ◽  
Philippe Lecomte ◽  
Robert Jérôme
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Unsaturated Polyester ◽  
Side Reaction ◽  
Monomer Conversion ◽  
Ring Opening Metathesis Polymerization ◽  
Aliphatic Polyesters ◽  
Metathesis Polymerization ◽  
Insertion Mechanism ◽  
Alternative Routes

AbstractRing-opening polymerization (ROP) and ring-opening metathesis polymerization (ROMP) of an unsaturated ε-caprolactone, 6,7-dihydro-2(3H)-oxepinone (DHO2), are alternative routes to produce unsaturated aliphatic polyesters with the same molecular structure. Polymerization of DHO2 initiated by Al isopropoxide in toluene at room temperature or at 0°C proceeds by a coordination-insertion mechanism, although intramolecular transesterification takes place beyond complete monomer conversion. The molecular weight distribution is narrow as long as monomer conversion does not exceed 90%. Ring-opening metathesis polymerization of DHO2 initiated by Schrock’s Mo-based catalyst, 1, at 60°C allows higher molecular weight unsaturated polyester to be prepared, even though an intramolecular side reaction also operates. The structure of poly(DHO2) synthesized by ROP and ROMP is the same, as confirmed by 1H, 13C NMR, and FT-IR spectra. Copolymers of DHO2 with norbornene, cis-cyclooctene, and 1,5-cyclooctadiene have been successfully prepared.

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