Study of radiation-induced polymerization of vinyl monomers adsorbed on inorganic substances. X. Influence of H2O on the styrene–silica gel system

Autor:	Eiichi Kageyama, Kazuyuki Fukano
Rok vydání:	1977
Předmět:	chemistry.chemical_classification chemistry.chemical_compound Adsorption Monomer chemistry Polymerization Silica gel Polymer chemistry Cationic polymerization Polymer respiratory system Grafting Styrene
Zdroj:	Journal of Polymer Science: Polymer Chemistry Edition. 15:65-72
ISSN:	1542-9369 0360-6376
DOI:	10.1002/pol.1977.170150107
Popis:	To elucidate the reaction mechanism of radiation-induced polymerization of the styrene—silica gel system, the influence of H2O as adsorbed water and inhibitor of cationic polymerization was investigated by two methods. Monomer conversion decreased as H2O increased. In general, percent grafting decreased as H2O increased, but the presence of a small amount of H2O increased the percent grafting. Grafting at 16 Mrad has a maximum value at a water content of about 0.2%. This seems to be due to two effects of H2O: percent grafting increases due to restraint of cationic polymerization by H2O, but the percent grafting decreases due to adsorption water which interrupts the contact of styrene with silica gel. In GPC spectra, the low molecular weight peaks of both graft polymers and homopolymers decreased when H2O was added. The GPC results suggest that the number of positive holes which initiate cationic polymerization is very large.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7ae65980a2c4e033d3c9abff2c1d9a6b https://doi.org/10.1002/pol.1977.170150107 Zobrazit plný text záznamu Plný text