Anionic Polymerization of Acrylic Monomers. 14. Carbon-13 and Lithium-7 NMR Characterization of the Complexation of Methyl .alpha.-Lithioisobutyrate with Various Lithium Cation-Binding Ligands in Tetrahydrofuran

1994 ◽  
Vol 27 (12) ◽  
pp. 3376-3382 ◽  
Author(s):  
J. S. Wang ◽  
R. Jerome ◽  
R. Warin ◽  
H. Zhang ◽  
Ph. Teyssie
Keyword(s):  
Anionic Polymerization ◽  
Cation Binding ◽  
Lithium Cation ◽  
Nmr Characterization ◽  
Acrylic Monomers

Synthesis and characterization of poly(ethyl glyoxylate) – a new potentially biodegradable polymer

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Fabrice Burel ◽  
Laetitia Rossignol ◽  
Pascale Pontvianne ◽  
Jonas Hartman ◽  
Nicole Couesnon ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Anionic Polymerization ◽  
Phenyl Isocyanate ◽  
Bernoulli Process ◽  
Molecular Weights ◽  
Nmr Characterization ◽  
End Capping ◽  
Lower Glass Transition Temperature ◽  
C Nmr

Abstract Poly(ethyl glyoxylate) (PEtG), a new polyacetal, was synthesized via anionic polymerization in CH2Cl2. End-capping was achieved using phenyl isocyanate. Average molecular weights in the range of 9000 - 216 000 were obtained. 1H and 13C NMR characterization highlight the non-stereoregularity of PEtG. The polymer is quasi-atactic and the polymerization almost followed a Bernoulli process. Compared to its homologue poly(methyl glyoxylate), PEtG exhibits enhanced thermal stability (>200°C) and a lower glass transition temperature, Tg. Molecular weight influences Tg, but does not affect thermal stability.

Anionic polymerization of acrylic monomers. 8. Synthesis and characterization of (meth)acrylic end-functionalized polymers: macromonomers and telechelics

1992 ◽  
Vol 25 (21) ◽  
pp. 5578-5584 ◽  
Author(s):  
Sunil K. Varshney ◽  
Philippe Bayard ◽  
Christian Jacobs ◽  
Robert Jerome ◽  
Roger Fayt ◽  
...  
Keyword(s):  
Anionic Polymerization ◽  
Functionalized Polymers ◽  
Synthesis And Characterization ◽  
Acrylic Monomers

NMR characterization of complex natural products: Assigning novel, proton-deficient alkaloid scaffolds

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
KR Gustafson ◽  
STS Chan ◽  
D Milanowski
Keyword(s):  
Natural Products ◽  
Nmr Characterization

Characterization of New Ionically Conducting Peo-Based Networks by Diffusion, Elasticity Modulus and Ionic Conductivity Measurements

1992 ◽  
Vol 293 ◽  
Author(s):  
Herve Cheradame ◽  
F. Desbat ◽  
P. Mercier-Niddam ◽  
S. Boileau
Keyword(s):  
Diffusion Coefficient ◽  
Ionic Conductivity ◽  
Elasticity Modulus ◽  
Sol Gel ◽  
Cation Transport ◽  
Lithium Cation ◽  
Conductivity Measurements ◽  
Conducting Materials ◽  
Diffusion Studies

AbstractIonically conducting materials containing PEO were prepared from telechelic di(methyl-diethoxy-silane) PEO, synthesized by the hydrosilylation of telechelic diallyl-PEO with methyldiethoxysilane. The network is obtained by the usual sol-gel chemistry. Then, it is filled with LiClO4 by diffusion of the salt and further drying. A comparison is made with the same kind of materials crosslinked using urethane chemistry. Diffusion studies show that the diffusion coefficient of solvent is similar for both types of materials, whilst the ionic conductivity is higher for the networks crosslinked with siloxane bonds. An experiment of diffusion of LiClO4 without solvent showed that this salt has a diffusion coefficient of the order of 2.10-8 cm2.sec-1 at 34°C. The conductivity calculated from this determination is compatible with the mechanism of lithium cation transport by the diffusion of salt molecules. Elasticity modulus measurements show that the salt aggregates are essentially located within the crosslinks at low concentration, but also in the PEO chains for salt concentrations higher than 1 mol/l.

Synthesis and 31 P NMR characterization of new low toxic highly sensitive pH probes designed for in vivo acidic pH studies

2002 ◽  
Vol 10 (5) ◽  
pp. 1451-1458 ◽  
Author(s):  
Sophie Martel ◽  
Jean-Louis Clément ◽  
Agnès Muller ◽  
Marcel Culcasi ◽  
Sylvia Pietri
Keyword(s):  
Acidic Ph ◽  
Highly Sensitive ◽  
Nmr Characterization ◽  
Low Toxic ◽  
Ph Probes
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