1359045 Polymers of vinylpyrene and their preparation by anionic polymerization XEROX CORP 23 July 1971 [28 July 1970] 34701/71 Headings C3P C3T and C3R [Also in Division C5 Homopolymers of vinylpyrene are prepared polymerizing it with an initiator selected from alkali metals, anion radical adducts and mono- and difunctional alkyl and aralkyl carbanions in an aprotic diluent. Block polymers of two or more segments, one (or more in the case of 3 or more segments) of which is polyvinylpyrene, are prepared by sequential polymerization using the above initiator and an aprotic diluent, one of the monomers (not necessarily the first) being vinylpyrene, and the other or others being monomer(s) capable of nucleophilic addition polymerization. The vinylpyrene is preferably 3-vinylpyrene. In the case of the block polymers, other monomers are dienes (e.g. isoprene and 1,3-butadiene), vinyl aromatics (e.g. styrene), vinyl heteroaromatics, methacrylates, acrylates, unsaturated nitriles and N,N- disubstituted unsaturated amides, aldehydes, isocyanates, siloxanes, cyclic ethers and thioethers, and lactones. Block polymers comprising at least two segments, one of which is polyvinylpyrene, and the other of which is a polymer of a monomer capable of undergoing nucleophilic addition, are claimed per se. The preferred aprotic diluent is tetrahydrofuran although others specified are dimethoxyethane, diethyl ether, benzene, hexane and mixtures thereof. In Example 1, 3-vinylpyrene is homopolymerized in T.H.F. using n-butyl lithium. In Examples (2)-(8) and (13), the following block polymers are produced: (2) polystyrene - poly 3 - vinylpyrene; (3) polystyrene - polyvinylpyrene - polystyrene; (4) polyisoprene - polyvinylpyrene; (5) polyvinylpyrene - polyisoprene - polyvinylpyrene; (6) polyvinylpyridine - polyvinylpyrene - polyvinylpyridine; (7) polyvinylpyrene - polymethyl methacrylate; (8) polyvinylpyrenepolyacrylonitrile and (13) polyvinylpyrenepolybutadiene. Also prepared are the following block polymers, in the examples indicated: (9) polyvinylpyrene - polyethylene oxide; (10) polydimethyl siloxane - polyvinylpyrenepolydimethylsiloxane; (11) polyvinylpyrenepolyacetaldehyde and (12) polyvinylpyrenepolyisobutyl isocyanate. The initiators used are conventional organometallic compounds normally used and the diluents are selected from those specified above, and in addition, toluene.
展开▼
