Synthesis of 4μ-PS2 PEO2 , 4μ-PS2 PCL2 , 4μ-PI2 PEO2 , and 4μ-PI2 PCL2 star-shaped copolymers by the combination of glaser coupling with living anionic polymerization and ring-opening polymerization

2010 ◽  
Vol 48 (23) ◽  
pp. 5313-5321 ◽  
Author(s):  
Guowei Wang ◽  
Xiaoshan Fan ◽  
Junlian Huang
Keyword(s):  
Anionic Polymerization ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Living Anionic Polymerization ◽  
Glaser Coupling

scholarly journals Anionic Polymerization of β-Butyrolactone Initiated with Sodium Phenoxides. The Effect of the Initiator Basicity/Nucleophilicity on the ROP Mechanism

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1221 ◽  
Author(s):  
Adrian Domiński ◽  
Tomasz Konieczny ◽  
Magdalena Zięba ◽  
Magdalena Klim ◽  
Piotr Kurcok
Keyword(s):  
Anionic Polymerization ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Elimination Reaction ◽  
Mild Conditions ◽  
Acidic Proton ◽  
End Groups ◽  
Anionic Ring

It was shown that selected sodium phenoxide derivatives with different basicity and nucleophilicity, such as sodium p-nitrophenoxide, p-chlorophenoxide, 1-napthoxide, phenoxide and p-methoxyphenoxide, are effective initiators in anionic ring-opening polymerization (AROP) of β-butyrolactone in mild conditions. It was found that phenoxides as initiators in anionic ring-opening polymerization of β-butyrolactone behave as strong nucleophiles, or weak nucleophiles, as well as Brønsted bases. The resulting polyesters possessing hydroxy, phenoxy and crotonate initial groups are formed respectively by the attack of phenoxide anion at (i) C2 followed by an elimination reaction with hydroxide formation, (ii) C4 and (iii) abstraction of acidic proton at C3. The obtained poly(3-hydroxybutyrate) possesses carboxylate growing species. The ratio of the observed initial groups strongly depends on the basicity and nucleophilicity of the sodium phenoxide derivative used as initiator. The proposed mechanism of this polymerization describes the reactions leading to formation of observed end groups. Moreover, the possibility of formation of a crotonate group during the propagation step of this polymerization is also discussed.

scholarly journals Synthesis and anionic polymerization of isosorbide mono-epoxides for linear biobased polyethers

2021 ◽  
Author(s):  
Livia Matt ◽  
Ilme Liblikas ◽  
Olivier Bonjour ◽  
Patric Jannasch ◽  
Lauri Vares
Keyword(s):  
Anionic Polymerization ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Anionic Ring

A series of regioisomeric isosorbide mono-epoxides, as well as diastereomerically pure mono-epoxy derivatives, have been prepared and studied. Anionic ring-opening polymerization of methoxy-capped monomers produced linear polyethers tethered with isosorbide...

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