Linear and cyclic polymers or oligomers having a photoreactive ethene group
a technology of photoreactive ethene and linear cyclic polymers, which is applied in the field of linear and cyclic polymers or oligomers having a photoreactive ethene group, can solve the problems of incomplete conversion, insufficient stability with time, and inoptimal methods
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example 1
1 g of methacryloyloxyethyl 3-(E)-[4-pentyl-4'-biphenyl]acrylate and 0.002 g of azobisisobutyronitrile were dissolved in 4 ml of tetrahydrofuran. The solution was flushed for 10 minutes with a weak nitrogen stream and the reaction vessel was subsequently closed air-tight. The solution was heated to 60.degree. C. for 24 hours. Thereafter, the reaction vessel was opened and the solution was diluted with 5 ml of tetrahydrofuran while stirring. Subsequently, the diluted solution was added dropwise to 450 ml of diethyl ether while stirring at room temperature. The separated polymer was filtered off, dried, dissolved in 30 ml of dichlormethane and this solution was added dropwise to 450 ml of diethyl ether. This procedure was repeated twice. Filtration and drying at 50.degree. C. in a vacuum gave 0.4 g of poly(methacryloyloxyethyl 3-(E)-[4-pentyl-4'-biphenyl]acrylate), Tg. 123.degree. C., cl.p. (S-I) 160.degree. C.;
The methacryloyloxyethyl 3-(E)-[4-pentyl-4'-biphenyl]acrylate used as the ...
example 2
1.5 g of 4-methacryloyloxybutyl (E)-3-[4-(4-methoxyphenyl carbonyloxy)phenyl]acrylate and 0.003 g of azobisisobutyronitrile were dissolved in 6.8 ml of tetrahydrofuran. The solution was flushed for 10 minutes with a weak argon stream and subsequently the reaction vessel was closed air-tight. The solution was heated to 60.degree. C. for 20 hours. Thereafter, the reaction vessel was opened and the solution was diluted with 3.5 ml of tetrahydrofuran while stirring. Subsequently, the diluted solution was added dropwise to 300 ml of diethyl ether at room temperature while stirring. The separated polymer was filtered off, dried, dissolved in 10 ml of dichlormethane and this solution was added dropwise to 300 ml of diethyl ether. This procedure was repeated twice. Filtration and drying at 50.degree. C. in a vacuum gave 1.15 g of poly(4-methacryloyloxybutyl (E)-3-[4-(4-methoxyphenylcarbonyloxy)phenyl]acrylate). The polymer has a glass stage at Tg=38.degree. C. (.DELTA.c.sub.p =0.17 J / gK) an...
example 3
2.5 g of methacryloyloxyethyl (E)-3-(4-methoxyphenyl)-acrylate) and 2.5 g of 2-methacryloyloxyethyl (E)-3-(4-chlorophenyl)acrylate as well as 0.014 g of azobisisobutyronitrile were dissolved in 35 ml of tetrahydrofuran. The solution was flushed for 10 minutes with a weak argon stream and the reaction vessel was subsequently closed air-tight. The solution was heated to 60.degree. C. for 24 hours. Thereafter, the reaction vessel was opened and the solution was diluted with 7.5 ml of tetrahydrofuran while stirring. Subsequently, the diluted solution was added dropwise to 500 ml of diethyl ether while stirring at room temperature. The separated polymer was filtered off, dried, dissolved in 40 ml of dichloromethane and this solution was added dropwise to 500 ml of diethyl ether. This procedure was repeated twice. Filtration and drying at 50.degree. C. in a vacuum gave 3.8 g of poly(2-methacryloyloxyethyl (E)-3-(4-methoxyphenyl)acrylate-co-2-methacryloyloxyethyl (E)-3-(4-chlorophenyl)acry...
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