摘要:
(I) COMPOUNDS HAVINGINDEPENDENT PEROXIDIC (X) AND ALIPHATIC AZO GROUPS OF THE FORMULA
((R-N=N-R'')M-X)N
EXAMPLE: DI-T-BYTYLPEROXY ESTER OF CIS-4,4''-AZOBIS-(4CYANOVALERIC ACID). (II) A METHOD OF MAKING A BLOCK POLYMER WHERE VINYL MONOMER IS INITIATED SEQUENTIALLY TO PRODUCE IN ONE INSTANCE: A POLYMER HAVING AZO-CARBON LINKAGES PRESENT, WHICH IS THEN REACTED WITH VINYL MONOMER UNDER CONDITIONS TO RUPTURE THE AZO-CARBON LINKAGES, AND IN ANOTHER INSTANCE: A POLYMER HAVING PEROXY-CARBON LINKAGES PRESENT, WHICH IS THEN REACTED WITH VINYL MONOMER UNDER CONDITIONS TO RUPTURE THE PEROXY CARBON LINKAGES.
摘要:
Block copolymers are prepared by polymerizing an unsaturated monomer in the presence of a polymerization catalyst and a chain transfer agent which is a cumyl peroxide containing one or more alkyl or cycloalkyl substituents, which substituents have at least one benzylic hydrogen atom, at a temperature below that which the peroxide decomposes, and subsequently polymerizing the peroxy containing polymer so formed in the presence of additional monomer at a temperature above the decomposition point of the peroxide.
摘要:
A DIESTER OF DIPEROXYFUMARIC ACID IS REACTED AT ITS DOUBLE BOND WITH AN ORGANIC COMPOUND R-(X)S WHERE "X" IS A MONOVALENT ATOM READILY ABSTRATABLE BY A FREE RADICAL, E.G., HYDROGEN, CHLORINE OR BROMINE, AND R IS INERT TO THE PEROXYCARBONYL GROUPS OF THE DIPEROXYFUNARATE TO FORM AN ADDITION PRODUCT INCLUDING AT LEAST ONE DIESTER OF A SUBSTITUTED DIPEROXYSUCCINIC ACID. FOR EXAMPLE: TETRAHYDROFURAN AND DI-T-BUTYL DIPEROXYFUMARATE REACT AT ABOUT 0*C. TO FROM DI-T-BUTYL ALPHA-(2-TETRAHYDROFURYL)DIPEROXYSUCCINATE. POLYGLOCOLS AND POLYVINYL ETHERS, ALCOHOLS, HALIDES, ETC. REACT TO GIVE POLYMERS HAVING PENDANT PAIRS OF PEROXYCARBONYL ESTES GROUPS IN GAMMA RELATIONSHIP TO EACH OTHER. THESE COMPOUNDS ARE OF ESPECIAL INTEREST IN THE PREPARATION OF BLOCK AND GRAFT COPOLYMERS.
摘要:
TERTIARY-ALKYL HALOCUMYL PEROXIDES OF THE FORMULA
((X)N,R(5-N)-PHENYL)-C(-CH3)2-O-O-R1
WHEREIN X IS F, CL, OR BR; N=1-5; R IS H, ALKYL, CYCLOALKYL, OR ARYL; AND R1 IS TERTIARY-ALKYL OF 4-8 CARBON ATOMS. THESE PEROXIDES ARE USEFUL FOR CROSSLINKING POLYMERIC MATERIALS WITHOUT PRODUCING AN OBJECTIONABLE ODOR.