Kinetics of Polymer Network Formation by Nitroxide-Mediated Radical Copolymerization of Styrene/Divinylbenzene in Supercritical Carbon Dioxide

The kinetics of nitroxide-mediated dispersion copolymerization with crosslinking of styrene (STY) and divinylbenzene (DVB) in supercritical carbon dioxide (scCO2) is addressed experimentally. 2,2,6,6-Tetramethylpiperidinyl-1-oxy (TEMPO) and dibenzoyl peroxide (BPO) were used as nitroxide controller...

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Bibliographic Details
Published in:Processes 2022-11, Vol.10 (11), p.2386
Main Authors: Jaramillo-Soto, Gabriel, Sarracino-Silva, Samuel Alejandro, Vivaldo-Lima, Eduardo
Format: Article
Language:English
Subjects:
Analysis
Carbon dioxide
Chemistry
Copolymerization
Crosslinked polymers
Crosslinking
Dibenzoyl peroxide
Divinylbenzene
Free radicals
Kinetics
Molecular weight
Network formation
Nitroxide
Polymer chemistry
Polymer industry
Polymerization
Polymers
Pressure cells
Sapphire
Styrene
Styrenes
Vacuum distillation
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Summary:The kinetics of nitroxide-mediated dispersion copolymerization with crosslinking of styrene (STY) and divinylbenzene (DVB) in supercritical carbon dioxide (scCO2) is addressed experimentally. 2,2,6,6-Tetramethylpiperidinyl-1-oxy (TEMPO) and dibenzoyl peroxide (BPO) were used as nitroxide controller and initiator, respectively. A high-pressure cell with lateral sapphire windows at 120 °C and 207 bar was used to carry out the polymerizations. The nitroxide-mediated homopolymerization (NMP) of STY, as well as the conventional radical copolymerization (FRC) of STY/DVB, at the same conditions were also carried out as reference and for comparison purposes. The effect of nitroxide content on polymerization rate, evolution of molecular weight averages, gel fraction, and swelling index was studied.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr10112386