Persulfate initiated free-radical polymerization of itaconic acid: Kinetics, end-groups and side products

0491293 - ÚMCH 2019 RIV GB eng J - Článek v odborném periodiku
Bednarz, S. - Wesolowska-Pietak, A. - Konefal, Rafal - Świergosz, T.
Persulfate initiated free-radical polymerization of itaconic acid: Kinetics, end-groups and side products.
European Polymer Journal. Roč. 106, September (2018), s. 63-71. ISSN 0014-3057. E-ISSN 1873-1945
Institucionální podpora: RVO:61389013
Klíčová slova: free-radical polymerization * oligomers * oxidation
Obor OECD: Polymer science
Impakt faktor: 3.621, rok: 2018

Persulfate initiated free radical homopolymerization of itaconic acid in aqueous media has been investigated at 65 °C. The research was focused on the elucidation of the chemical structure of low-molecular-weight side products and itaconic oligomers separated from polymeric fraction by dialysis (cut-off of 1000 Da). Nuclear magnetic resonance (NMR) 1H, 13C, 1H–13C me-HSQC and 1H–13C HMBC experiments and direct infusion electrospray ionization mass spectrometry (ESI-MS) operated in the negative ion mode have been combined to investigate the low-molecular fraction. It was found that 2-hydroxyparaconic and itatartaric acid are the primary oxidation products formed during free radical polymerization of itaconic acid. Besides, ESI-MS analysis revealed sulfate, hydroxyl and lactone terminal groups resulted from disproportionation, combination and transfer processes. Kinetics studies using Raman spectrometry in initiator range of 0.07–0.32 mol/L and for monomer concentration between 1.32 and 2.63 mol/L indicated non-classical dependency both polymerization rate and initiator decomposition rate on monomer and initiator concentration.
Trvalý link: http://hdl.handle.net/11104/0285394