Emulsifier-free, organotellurium-mediated living radical emulsion polymerization (emulsion TERP) of methyl methacrylate with dimethyl ditelluride as the catalyst

Autor:	Yukiya Kitayama, Masayoshi Okubo, Kazuya Kishida, Hirotaka Moribe
Rok vydání:	2012
Předmět:	Polymers and Plastics Chemistry Organic Chemistry Aqueous two-phase system Emulsion polymerization Bioengineering Chain transfer Degree of polymerization Biochemistry chemistry.chemical_compound Methacrylic acid Emulsion Polymer chemistry Solubility Methyl methacrylate
Zdroj:	Polymer Chemistry. 3:1555
ISSN:	1759-9962 1759-9954
DOI:	10.1039/c2py20105d
Popis:	Emulsifier-free, organotellurium-mediated living radical emulsion polymerization (emulsion TERP) of methyl methacrylate (MMA) using poly(methacrylic acid) (PMAA)–methyltellanyl (TeMe) (PMAA30-TeMe) (degree of polymerization of PMAA, 30) was carried out at 60 °C with 1000 rpm stirring. The emulsion TERP of MMA did not successfully proceed with maintaining a living manner because of a low chain transfer rate constant relative to propagation rate constant. Moreover, even in the coexistence of (TeBu)2, the emulsion TERP of MMA also did not proceed with living nature. On the other hand, it in the coexistence of (TeMe)2 proceeded with good control/livingness. The difference was caused by the different in the solubility in water between (TeBu)2 and (TeMe)2. Because (TeBu)2 is difficult to dissolve in the aqueous phase, it did not work as a catalyst in the aqueous phase, resulting in a homogeneous nucleation. On the other hand, because (TeMe)2, which is more hydrophilic than (TeBu)2, works as an efficient catalyst in the aqueous phase, resulting in the self-assembly nucleation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6daa061231cf1bb7ded79236556530ca https://doi.org/10.1039/c2py20105d Zobrazit plný text záznamu