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Syntheses and reactions of azo‐group containing networks
Author(s) -
Nuyken Oskar,
Grunow Arthur,
Pampus Gottfried
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890300122
Subject(s) - acrylonitrile , copolymer , divinylbenzene , natural rubber , monomer , polymer chemistry , molar mass , polymer , materials science , nitrile , styrene , chemistry , organic chemistry , composite material
Azo monomers of the general structurehave been terpolymerized with styrene and butadiene (I) to form azo‐group containing rubber (SBR). Copolymerization of butadiene and acrylonitrile with 3 yields azo group containing nitrile rubber (II). Networks are formed, if the copolymerization of butadiene and acrylonitrile is carried out in the presence of divinylbenzene (DVB) (III) or in the presence of DVB and 3 (IV). Thermolysis or photolysis of the polymeric azo initiators (I, II) yields networks without addition of a low molar‐mass crosslinking agent. Heating or irradiation of the azo‐containing pre‐network (IV) increases the network density. Heating a mixture of (II) or (IV) with natural rubber yields polymer blends which are stabilized by covalent links between the different polymers. The network characterization was carried out by swelling experiments. The incorporation of the azo monomers into the azo copolymers is almost ideal under “cold rubber” conditions, meaning that the composition of the products does not change with conversion.