On the mechanism of acrylamide emulsion polymerization with the participation of its dimers
| Autor: | L.R. Harutyunyan, R.S. Harutyunyan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
General Chemical Engineering
Emulsion polymerization 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Acrylamide Polymer chemistry Materials Chemistry Environmental Chemistry 0210 nano-technology Mechanism (sociology) |
| Zdroj: | Voprosy Khimii i Khimicheskoi Tekhnologii. :50-56 |
| ISSN: | 2413-7987 0321-4095 |
| DOI: | 10.32434/0321-4095-2021-136-3-50-56 |
| Popis: | The role of both dimeric and monomeric forms of acrylamide monomer in the process of polymerization in emulsions initiated by different type of initiators was discussed and the reasons for the reaction order with respect to monomer greater than unity were elucidated for acrylamide free radical polymerization in emulsions. The emulsion polymerization mechanism of acrylamide is discussed separately for the processes initiated by water-soluble initiator and oil-soluble initiator. The main difference in two cases is the distribution of acrylamide and initiator in aqueous and toluene phases. In the case of using water-soluble initiator, the initiator and acrylamide are in the same phase, whereas the molecules of the initiator and acrylamide are distributed between different phases in the case of using oil-soluble initiator. As a result, the participation of the dimers in the process of acrylamide emulsion polymerization is more efficient for the system where water-soluble initiator is used. For that system, it is suggested that both dimers and monomers of acrylamide participate in the propagation reaction at relatively low concentrations of acrylamide, which explains the value of the reaction order with respect to monomer greater than unity. |
| Databáze: | OpenAIRE |
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