Nitroxide-Mediated Polymerization of Styrene Initiated from the Surface of Laponite Clay Platelets

2007 ◽  
Vol 40 (21) ◽  
pp. 7464-7472 ◽  
Author(s):  
C. Konn ◽  
F. Morel ◽  
E. Beyou ◽  
P. Chaumont ◽  
E. Bourgeat-Lami
Keyword(s):  
Clay Platelets ◽  
Nitroxide Mediated Polymerization

Nitroxide-mediated polymerization of styrene initiated from the surface of montmorillonite clay platelets

2010 ◽  
pp. n/a-n/a
Author(s):  
Yongqian Shen ◽  
Yunpu Wang ◽  
Jiucun Chen ◽  
Hongjun Li ◽  
Zhiwen Li ◽  
...  
Keyword(s):  
Montmorillonite Clay ◽  
Clay Platelets ◽  
Nitroxide Mediated Polymerization

Grafting pH‐Responsive Copolymers to Cold Water‐Soluble Starch Using Nitroxide‐Mediated Polymerization

2021 ◽  
pp. 2100011
Author(s):  
Alexander T. Fritz ◽  
Jaime C. Cazotti ◽  
Omar Garcia‐Valdez ◽  
Niels M. B. Smeets ◽  
Marc A. Dubé ◽  
...  
Keyword(s):  
Cold Water ◽  
Soluble Starch ◽  
Water Soluble ◽  
Ph Responsive ◽  
Nitroxide Mediated Polymerization

scholarly journals Synthesis of poly (n-butyl acrylate) with tempo by nitroxide mediated polymerization method

2021 ◽  
pp. 096739112110245
Author(s):  
Amrita Sharma ◽  
PP Pande
Keyword(s):  
Butyl Acrylate ◽  
Low Cost ◽  
Polymerization Process ◽  
Polymerization Reaction ◽  
High Concentration ◽  
Acrylate Monomer ◽  
Controlled Polymerization ◽  
Acrylate Monomers ◽  
Nitroxide Mediated Polymerization ◽  
Polymerization Method

It has been observed that acrylate monomers are very difficult to polymerize with the low cost nitroxide catalyst 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO). Therefore, costly acyclic nitroxides such as N-tert-butyl-N-(1-diethylphosphono-2,2-dimethyl)-N-oxyl, (SG1), 2,2,5-Trimethyl-4-phenyl-3-azahexane-3-nitroxide (TIPNO) and TIPNO derivatives have to be used for the polymerization of the acrylic acid derivatives. There are very few reports on the use of TEMPO-derivatives toward the polymerization of n-butyl acrylate. Generally different reducing agents viz. glucose, ascorbic acid, hydroxyacetone etc. have been used to destroy excess TEMPO during the polymerization reaction. The acrylate polymerizations fail in the presence of TEMPO due to the strong C–O bond formed between the acrylate chain end and nitroxide. To the best of our knowledge, no literature report is available on the use of TEMPO without reducing agent or high temperature initiators, toward the polymerization of n-butyl acrylate. The present study has been carried out with a view to re-examine the application of low cost nitroxide TEMPO, so that it can be utilized towards the polymerization of acrylate monomers (e.g. n-butyl acrylate). We have been able to polymerize n-butyl acrylate using the nitroxide TEMPO as initiator (via a macroinitiator). In this synthesis, a polystyrene macroinitiator was synthesized in the first step from TEMPO, after this TEMPO end-capped styrene macroinitiator (PSt-TEMPO) is used to polymerize n-butyl acrylate monomer. The amount of macroinitiator taken was varied from 0.05% to 50% by weight of n-butyl acrylate monomer. The polymerization was carried out at 120°C by bulk polymerization method. The experimental findings showed a gradual increase in molecular weight of the polymer formed and decrease in the polydispersity index (PDI) with increase in amount of PSt-TEMPO macroinitiator taken. In all experiments conversion was more than 80%. These results indicate that the polymerization takes place through controlled polymerization process. Effect of different solvents on polymerization has also been investigated. In the following experiments TEMPO capped styrene has been used as macroinitiator leading to the successful synthesis of poly n-Butyl acrylate. It has been found that styrene macroinitiator is highly efficient for the nitroxide mediated polymerization, even in very small concentration for the synthesis of poly n-butyl acrylate. High concentration of macroinitiator results in the formation of block copolymers of polystyrene and poly ( n-butyl acrylate) viz. polystyrene-block-poly-( n-butyl acrylate). The use of TEMPO toward controlled polymerization is of much importance, because it is the nitroxide commercially available at the lowest cost.

scholarly journals Computational design of pH-switchable control agents for nitroxide mediated polymerization

2017 ◽  
Vol 19 (34) ◽  
pp. 22678-22683 ◽  
Author(s):  
Ganna Gryn’ova ◽  
Leesa M. Smith ◽  
Michelle L. Coote
Keyword(s):  
Quantum Chemistry ◽  
Room Temperature ◽  
Computational Design ◽  
Acid Base ◽  
Nitroxide Mediated Polymerization

In the present work we use accurate quantum chemistry to evaluate several known and novel nitroxides bearing acid–base groups as pH-switchable control agents for room temperature NMP.

Nitroxide-Mediated Polymerization of Styrene Initiated from the Surface of Silica Nanoparticles. In Situ Generation and Grafting of Alkoxyamine Initiators

2005 ◽  
Vol 38 (4) ◽  
pp. 1099-1106 ◽  
Author(s):  
C. Bartholome ◽  
E. Beyou ◽  
E. Bourgeat-Lami ◽  
P. Chaumont ◽  
F. Lefebvre ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
In Situ Generation ◽  
Nitroxide Mediated Polymerization
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