Metal-free and solvent-free access to α,ω-heterodifunctionalized poly(propylene oxide)s by N-heterocyclic carbene-induced ring opening polymerization

2010 ◽  
Vol 46 (18) ◽  
pp. 3203 ◽  
Author(s):  
Jean Raynaud ◽  
Winnie Nzahou Ottou ◽  
Yves Gnanou ◽  
Daniel Taton
Keyword(s):  
Propylene Oxide ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Free Access ◽  
Metal Free ◽  
Poly Propylene

Activated anionic ring-opening polymerization for the synthesis of reversibly cross-linkable poly(propylene oxide) based on furan/maleimide chemistry

2016 ◽  
Vol 7 (8) ◽  
pp. 1612-1622 ◽  
Author(s):  
Kévin Roos ◽  
Elena Dolci ◽  
Stéphane Carlotti ◽  
Sylvain Caillol
Keyword(s):  
Propylene Oxide ◽  
Ring Opening ◽  
Glycidyl Ether ◽  
Ring Opening Polymerization ◽  
Anionic Ring ◽  
Poly Propylene ◽  
Anionic Copolymerization

Controlled anionic copolymerization of propylene oxide and furfuryl glycidyl ether was developed for the synthesis of reversibly cross-linkable polyethers.

Organocatalytic sequential ring-opening polymerization of cyclic ester/epoxide and N-sulfonyl aziridine: metal-free and easy access to block copolymers

2021 ◽  
Vol 12 (37) ◽  
pp. 5328-5335
Author(s):  
Huishan Huang ◽  
Wenyi Luo ◽  
Linlin Zhu ◽  
Ying Wang ◽  
Zhen Zhang
Keyword(s):  
Block Copolymers ◽  
Propylene Oxide ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cyclic Ester ◽  
Easy Access ◽  
Metal Free

Sequential ring-opening polymerization of ε-caprolactone (ε-CL)/propylene oxide (PO) and N-sulfonyl aziridine switched by tosyl isocyanate (TSI) allows the metal-free synthesis of polysulfonamide-based copolymers.

Synthesis of metal-free poly(1,4-dioxan-2-one) by enzyme-catalyzed ring-opening polymerization

2000 ◽  
Vol 38 (9) ◽  
pp. 1560-1567 ◽  
Author(s):  
Haruo Nishida ◽  
Mitsuhiro Yamashita ◽  
Masumi Nagashima ◽  
Takeshi Endo ◽  
Yutaka Tokiwa
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Metal Free

Ring-Opening Polymerization of L-lactide Initiated by Samarium(III) Acetate

2019 ◽  
Vol 3 (2) ◽  
pp. 112-119
Author(s):  
Jesús Miguel Contreras Ramírez ◽  
Dimas Medina ◽  
Francisco López-Carrasquero ◽  
Ricardo Rafael Contreras
Keyword(s):  
1H Nmr ◽  
Ring Opening ◽  
Alkali Metals ◽  
Molar Mass ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Size Exclusion ◽  
Polymerization Process ◽  
Molar Ratio ◽  
Aliphatic Polyesters

Background: The synthesis of the aliphatic polyesters obtained by the ring opening polymerization has been achieved using as initiators a large amount of organometallic compounds derivative from: Alkali metals, alkaline earth metals, transition metals and lanthanide metals. Of all these compounds, the lanthanide derivatives have acquired great importance in the synthesis of aliphatic polyesters, since these show a greater catalytic activity and also can provide polymer with characteristics that will be very useful in the design of biomaterials. Objective: It was proposed the synthesis of poly(L-lactida) (PL-LA) through a ring opening polymerization process of L-lactide initiated with samarium(III) acetate (Sm(OAc)3) under solvent-free melt conditions. The influence of different parameters of reaction, such as temperature, time, molar ratio monomer to initiator, on typical variables of polymers, e.g., conversion, dispersity, and molar mass, were analyzed. Methods: All polymerizations were carried out under solvent-free melt conditions in ampoules-like flasks, equipped with a magnetic stirrer. The obtained polyesters were characterized by size exclusion chromatography (SEC) and 1H-NMR. Results: The Sm(OAc)3 induces the polymerization of L-LA at high conversion, and produce polyesters with number-average molecular weights of 1.00 x 103 to 30.00 x 103 Dalton. The 1H-NMR analysis indicates a typical polymerization mechanism of coordination-insertion, with a breakdown of the acyl-oxygen bond of the L-LA. Conclusion: Sm(OAc)3 was an effective initiator for the ring-opening polymerization of L-LA. SEC chromatography showed that, at high temperatures and prolonged reaction times, the molar mass of the polyester decreases, which is associated with the transesterification collateral reactions that occur during the polymerization process.

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