Diazonium salt-based photoiniferter as a new efficient pathway to clay–polymer nanocomposites

RSC Advances ◽  
2016 ◽  
Vol 6 (91) ◽  
pp. 88126-88134 ◽  
Author(s):  
Hanène Salmi-Mani ◽  
Zouhair Ait-Touchente ◽  
Aazdine Lamouri ◽  
Benjamin Carbonnier ◽  
Jean-François Caron ◽  
...  
Keyword(s):  
Free Radical ◽  
Polymer Nanocomposites ◽  
Glycidyl Methacrylate ◽  
Diazonium Salt ◽  
Diazonium Salts ◽  
Mass Loading ◽  
Organic Mass ◽  
Free Radical Photopolymerization

Diazonium salts were used to prepare clay–polymer nanocomposites by living free radical photopolymerization of glycidyl methacrylate. The resulting intercalated nanocomposites have an organic mass loading of ∼41 wt% and a polymer-rich surface.

scholarly journals Epoxy-Based Structural Self-Adhesive Tapes Modified with Acrylic Syrups Prepared via a Free Radical Photopolymerization Process

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 189
Author(s):  
Konrad Gziut ◽  
Agnieszka Kowalczyk ◽  
Beata Schmidt ◽  
Krzysztof Kowalczyk ◽  
Mateusz Weisbrodt
Keyword(s):  
Shear Strength ◽  
Free Radical ◽  
Dynamic Viscosity ◽  
Glycidyl Methacrylate ◽  
Bulk Polymerization ◽  
Butyl Methacrylate ◽  
Crosslinking Degree ◽  
Mixing Speed ◽  
Molecular Weights ◽  
Free Radical Photopolymerization

New modifiers (i.e., acrylic syrups; ASs) of epoxy-resin-based thermally curable structural self-adhesive tapes (SATs) were prepared via a free radical bulk polymerization (FRBP) of n-butyl acrylate, butyl methacrylate, glycidyl methacrylate, and hydroxybutyl acrylate. In the process, two kinds of UV-photoinitiators (i.e., monoacylphosphine oxide/Omnirad TPO and bisacylphosphine oxide/Omnirad 819) and various mixing speed of the monomers mixture (200–1000 rpm) were applied. The TPO-based syrups exhibited a lower copolymers content (10–24 wt%), dynamic viscosity (<0.1 Pa·s), molecular weights (Mn and Mw, and polydispersity (1.9–2.5) than these with Omnirad 819. Additionally, the higher mixing speed significantly reduced monomers conversion and viscosity of ASs as well as molecular weights of the acrylate copolymers. These parameters influenced the properties of thermally uncured (e.g., adhesion) and thermally cured SATs (shear strength of aluminum/SAT/aluminum overlap joints). Better self-adhesive features were observed for SATs-TPO (based on ASs with lower monomers conversion, Mn and Mw); however, a slightly higher shear strength was noted for the thermally cured SAT-819 (ASs with higher monomers conversion, Mn and Mw). An impact of polydispersity of the acrylate copolymers as well as crosslinking degree of thermally cured SATs on the mechanical strength was also revealed.

scholarly journals Cubane Cu4I4(phosphine)4 Complexes as New Co-initiator for Free Radical Photopolymerization: Towards Aromatic Amine-Free Systems

2021 ◽  
Author(s):  
Jacques Lalevée ◽  
Fatima Hammoud ◽  
Mahmoud Rahal ◽  
Julien Egly ◽  
Fabrice Morlet-Savary ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Aromatic Amine ◽  
Free Radical Polymerization ◽  
Copper Iodide ◽  
Free Radical Photopolymerization ◽  
Acrylate Monomers ◽  
First Time

The investigation of copper-iodide cubane derivatives as new co-initiators for the free radical polymerization (FRP) of acrylate monomers under mild irradiation conditions is described for the first time here. These...

Reactions of 2-(benzimidazol-2-yl)acetonitrile and its N-ethoxycarbonyl derivative with some azol-3-diazonium salts

1984 ◽  
Vol 49 (1) ◽  
pp. 275-279 ◽  
Author(s):  
Jan Slouka ◽  
Vojtěch Bekárek
Keyword(s):  
Diazonium Salt ◽  
Ethyl Chloroformate ◽  
Diazonium Salts

Coupling of 2-(1-ethoxycarbonyl-benzimidazol-2-yl)acetonitrile (II) with 5-methylpyrazol-3-diazonium (IIIa) or indazol-3-diazonium salt (IIIb) does not give the corresponding derivatives VIIa, VIIb of pyrazolo[3,2-c]-1,2,4-triazine but, instead, gives the corresponding 2-(3-azolyl)-1-oxo-1,2-dihydro-1,2,4-triazino-[4,5-a]benzimidazole-4-carbonitriles VIIIa, VIIIb. Coupling of 2-(benzimidazol-2-yl)acetonitrile (I) with the diazonium salt IIIa gives 7-amino-6-(benzimidazol-2-yl)-2-methylpyrazolo[3,2-c]-1,2,4-triazine (VIa) which, on reaction with ethyl chloroformate, undergoes cyclization to 2-methyl-12,13-dihydropyrazolo[3",2":3',4']-1,2,4-triazino[5',6':6,5]-pyrimido[3,4-a]benzimidazol-12-one (IXa). The compound VIa and 1-amino-2-(benzimidazol-2-yl)-1,2,4-triazono[4,3-b]indazole (VIb) are also formed by recyclization of the compounds VIIIa and VIIIb, respectively, in boiling aqueous pyridine.

Star-shaped Polymers through Simple Wavelength-Selective Free-Radical Photopolymerization

2017 ◽  
Vol 56 (45) ◽  
pp. 14306-14309 ◽  
Author(s):  
Anna Eibel ◽  
David E. Fast ◽  
Jürgen Sattelkow ◽  
Michal Zalibera ◽  
Jieping Wang ◽  
...  
Keyword(s):  
Free Radical ◽  
Free Radical Photopolymerization

Photopolymerization of methyl methacrylate: effects of photochemical and photonic parameters on the chain length

2014 ◽  
Vol 5 (21) ◽  
pp. 6236-6243 ◽  
Author(s):  
V. Charlot ◽  
A. Ibrahim ◽  
X. Allonas ◽  
C. Croutxé-Barghorn ◽  
C. Delaite
Keyword(s):  
Free Radical ◽  
Methyl Methacrylate ◽  
Chain Length ◽  
Free Radical Photopolymerization

The effects of photochemical and photonic parameters are investigated on the chain length of poly(methylmethacrylate) (PMMA) as formed by the free radical photopolymerization process.

scholarly journals AROMATIC SUBSTITUTION: PART IX. ON THE MECHANISM OF THE PSCHORR CYCLIZATION

1965 ◽  
Vol 43 (4) ◽  
pp. 940-949 ◽  
Author(s):  
R. A. Abramovitch ◽  
G. Tertzakian
Keyword(s):  
Acid Solution ◽  
Diazonium Salt ◽  
Equimolar Mixture ◽  
Diazonium Salts ◽  
Aromatic Substitution ◽  
Radical Process ◽  
Aqueous Acid Solution ◽  
Aqueous Acid ◽  
Catalyzed Reactions

The decomposition of the diazonium salt from 3-(o-aminobenzoyl)pyridine has been studied under various conditions. A competitive-type cyclization of an equimolar mixture of the diazonium salts of 2-aminobenzophenone and 2-amino-3′-nitrobenzophenone has also been carried out. The results are interpreted in terms of a radical process in the copper-catalyzed reactions. It is suggested that the uncatalyzed thermal decompositions in aqueous acid solution give rise to a diradical cation intermediate in equilibrium with the aryl cation.

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