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丙烯酸乙酯(EA)与丙烯(P)或乙烯(E)在 BF_3存在下,25℃用偶氮二异丁腈(AIBN)引发共聚,可获得EA-P(或EA-E)共聚物。当[P]/(EA·BF_3)<1时,所得共聚物为结合EA的摩尔分数大于 P的无规共聚物,而当[P][EA·BF_3)≥1时,则可得到交替共聚物。单体配比不仅影响共聚物的组成,而且影响共聚速率,当[P]/[EA·BF_3]=1时,共聚速率达到极大值。当络合比BF_3/EA 为 0.6—1.0时,不影响共聚物的组成,但影响共聚速率;当BF_3/EA=1时,共聚速率最大。还用60 MHZ的~1H-NMR 分析了均聚物 PEA、EA-P 无规共聚物和交替共聚物以及EA-E 交替共聚物。
EA-P (or EA-E) copolymer can be obtained by initiating copolymerization of ethyl acrylate (EA) with propylene (P) or ethylene (E) in the presence of BF 3 at 25 ° C with azobisisobutyronitrile (AIBN). When [P] / (EA · BF_3) <1, the copolymer obtained is a random copolymer having a molar fraction of EA bound to P, and when [P] [EA · BF_3] ≧ 1, alternating copolymerization Things. The monomer ratio not only affects the composition of copolymer, but also affects the copolymerization rate. When [P] / [EA · BF_3] = 1, the copolymerization rate reaches the maximum. When the complexing ratio BF_3 / EA was 0.6-1.0, the copolymer composition was not affected, but the copolymerization rate was affected. When BF_3 / EA = 1, the copolymerization rate was the highest. Homopolymer PEA, EA-P random copolymer and alternating copolymer, and EA-E alternating copolymer were also analyzed by ~ 1H-NMR with 60 MHZ.