scholarly journals Introduction of Stilbene Derivatives and Cinnamate Ester Derivatives at the ω-End Groups of Poly(Methyl Methacrylate) Prepared via RAFT Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2449
Author(s):  
Martyn Dobinson ◽  
Philip Hodge ◽  
Trevor Wear
Keyword(s):  
Nmr Spectroscopy ◽  
Methyl Methacrylate ◽  
Raft Polymerization ◽  
19F Nmr ◽  
19F Nmr Spectroscopy ◽  
Poly Methyl Methacrylate ◽  
End Groups ◽  
Stilbene Derivatives

The capping of “living” poly(methyl methacrylate) (PMMA) and “living” polystyrene (PS), both prepared by the RAFT technique, with various olefins was screened using 19F-NMR spectroscopy. The capping of “living” PMMA with a labeled stilbene was as high as 63% and with certain cinnamate esters was essentially quantitative, but the capping of “living” polystyrene with all the olefins investigated was generally poor.

A Potential New RAFT - Click Reaction or a Cautionary Note on the Use of Diazomethane to Methylate RAFT-synthesized Polymers

2011 ◽  
Vol 64 (4) ◽  
pp. 433 ◽  
Author(s):  
Ming Chen ◽  
Graeme Moad ◽  
Ezio Rizzardo
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Room Temperature ◽  
Click Reaction ◽  
Raft Polymerization ◽  
Dipolar Cycloaddition ◽  
Low Molecular Weight ◽  
Similar Reaction ◽  
Poly Methyl Methacrylate ◽  
End Groups

It has been found that diazomethane undergoes a facile 1,3‐dipolar cycloaddition with both dithiobenzoate RAFT agents and the dithiobenzoate end‐groups of polymers formed by RAFT polymerization. Thus, 2‐cyanoprop‐2‐yl dithiobenzoate on treatment with diazomethane at room temperature provided a mixture of stereoisomeric 1,3‐dithiolanes in near quantitative (>95%) yield. A low‐molecular‐weight RAFT‐synthesized poly(methyl methacrylate) with dithiobenzoate end‐groups underwent similar reaction as indicated by immediate decolourization and a quantitative doubling of molecular weight. Higher‐molecular‐weight poly(methyl methacrylate)s were also rapidly decolourized by diazomethane and provided a product with a bimodal molecular weight distribution. Under similar conditions, the trithiocarbonate group does not react with diazomethane.

Validation of a Method for Assay of Trifluoroacetates in the Pharmaceutical Substance Glatiramer Acetate by 19F NMR Spectroscopy

2018 ◽  
Vol 52 (7) ◽  
pp. 658-662 ◽  
Author(s):  
S. V. Moiseev ◽  
N. E. Kuz’mina ◽  
V. I. Krylov ◽  
V. A. Yashkir ◽  
V. A. Merkulov
Keyword(s):  
Nmr Spectroscopy ◽  
Glatiramer Acetate ◽  
19F Nmr ◽  
Pharmaceutical Substance ◽  
19F Nmr Spectroscopy

scholarly journals 19F NMR Spectroscopy as a Highly Sensitive Method for the Direct Monitoring of Confined Crystallization within Nanoporous Materials

2016 ◽  
Vol 55 (31) ◽  
pp. 8904-8908 ◽  
Author(s):  
Karol P. Nartowski ◽  
Diksha Malhotra ◽  
Lucy E. Hawarden ◽  
Juraj Sibik ◽  
Dinu Iuga ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Nanoporous Materials ◽  
19F Nmr ◽  
19F Nmr Spectroscopy ◽  
Confined Crystallization ◽  
Highly Sensitive ◽  
Sensitive Method

scholarly journals Synthesis and post-polymerization reaction of end-clickable stereoregular polymethacrylates via termination of stereospecific living anionic polymerization

2015 ◽  
Vol 6 (7) ◽  
pp. 1078-1087 ◽  
Author(s):  
Yasuhiro Kohsaka ◽  
Takashi Kurata ◽  
Kazuki Yamamoto ◽  
Shoya Ishihara ◽  
Tatsuki Kitayama
Keyword(s):  
Methyl Methacrylate ◽  
Anionic Polymerization ◽  
Polymerization Reaction ◽  
Living Anionic Polymerization ◽  
Poly Methyl Methacrylate ◽  
End Groups

Poly(methyl methacrylate)s with high stereoregularity and clickable end-groups were synthesized via terminating reactions with α-(halomethyl)acrylates in stereospecific living anionic polymerization.

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