Controlled Synthesis of High Molecular Weight Telechelic Polybutadienes by Ring-Opening Metathesis Polymerization

2004 ◽  
Vol 37 (15) ◽  
pp. 5485-5489 ◽  
Author(s):  
Shengxiang Ji ◽  
Thomas R. Hoye ◽  
Christopher W. Macosko
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ring Opening ◽  
Controlled Synthesis ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization

scholarly journals Synthesis of Soluble Star-Shaped Polymers via In and Out Approach by Ring-Opening Metathesis Polymerization (ROMP) of Norbornene: Factors Affecting the Synthesis

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 670 ◽  
Author(s):  
Zelin Sun ◽  
Kazuya Morishita ◽  
Kotohiro Nomura
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ring Opening ◽  
Core Formation ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
The Core ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Formation Step

The methods for one-pot synthesis of ‘soluble’ star-shaped polymers by sequential living ring-opening metathesis polymerization (ROMP) of norbornene (NBE) and cross-linking (CL) reagent using Mo(CHCMe2Ph)(N-2,6-iPr2C6H3)(OtBu)2 have been explored. The method (called the “in and out” or core-first approach) basically consists of (i) the living ROMP of NBE (formation of arm), (ii) reaction with CL (formation of core), (iii) additional living ROMP of NBE (propagating arms from the core, formation of star), (iv) end-modification via Wittig-type cleavage of metal–carbon double bonds containing polymer chain with aldehyde. Two different approaches in the core formation step (reaction with CL mixed with/without NBE) for synthesis of the high molecular weight star-shaped ROMP polymers with more branching, unimodal molecular weight distributions have been explored in detail. The method (reacting CL with NBE in the core formation step) under highly diluted conditions afforded the high molecular weight polymers with unimodal molecular weight distributions.

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.

Synthesis of polymers with a controlled molecular weight via ring-opening metathesis polymerization (ROMP) with a ruthenium-based catalyst

1999 ◽  
Vol 2 (1) ◽  
pp. 69-77 ◽  
Author(s):  
Stephan C. Glander ◽  
Ulrich Frenzel ◽  
Oskar Nuyken ◽  
Wolfgang C. Schattenmann ◽  
Wolfgang A. Herrmann
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization
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