Synthesis and characteristics of polystyryl aluminium derivatives and their reaction with benzoyl peroxide

Autor:	E.B Milovskaya, L.V Zamoiskaya
Rok vydání:	1982
Předmět:	Polymers and Plastics Radical Organic Chemistry Electron donor Chain transfer Benzoyl peroxide chemistry.chemical_compound Monomer chemistry Polymerization Pyridine Polymer chemistry Materials Chemistry medicine Copolymer medicine.drug
Zdroj:	Polymer. 23:891-896
ISSN:	0032-3861
DOI:	10.1016/0032-3861(82)90153-7
Popis:	Thermal polymerization of styrene in the presence of AlEt 3 acting as the chain transfer agent permits the synthesis of polystyryl derivatives of aluminium (polySt) n AlEt 3− n (poly St-Al). It is possible to regulate the length of the polymer radical over a wide range ( P n = 2–800) by altering the ratio of the monomer to the chain transfer agent. A high degree of substitution of ethyl groups occurs only for styryl derivatives containing relatively low-molecular weight substituents ( P n = 2−30). The reaction of polySt-Al with benzoyl peroxide occurs virtually instantaneously even at 0° and is accompanied by the formation of free polystyryl radicals. Their continuous formation was regulated by introducing catalytic amounts of pyridine as the electron donor into the reaction mixture. A polySt-Al ( P n = 30)BPPy system was used as an example of showing that these systems can be very effective initiators of the low-temperature free-radical polymerization of a series of acrylic and methacrylic monomers. The process yields a block copolymer. The data was used for the further development of the synthesis of block copolymers with initiating systems of the poly StAl-peroxide type under low-temperature free-radical polymerization conditions.
Databáze:	OpenAIRE
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