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首页> 外文期刊>Polymers >Highly Active Copolymerization of Ethylene and N -Acetyl- O -(ω-Alkenyl)- l -Tyrosine Ethyl Esters Catalyzed by Titanium Complex
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Highly Active Copolymerization of Ethylene and N -Acetyl- O -(ω-Alkenyl)- l -Tyrosine Ethyl Esters Catalyzed by Titanium Complex

机译：钛配合物催化乙烯与N-乙酰基-O-（ω-烯基）-1-酪氨酸乙酯的高活性共聚

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A series of N -acetyl- O -(ω-alkenyl)- l -tyrosine ethyl esters were synthesized by the reaction of vinyl bromides (4-bromo-1-butene, 6-bromo-1-hexene, 8-bromo-1-octene and 10-bromo-1-decene) with N -acetyl- l -tyrosine ethyl ester. 1 H NMR, elemental analysis, FT-IR, and mass spectra were performed for these N -acetyl- O -(ω-alkenyl)- l -tyrosine ethyl esters. The novel titanium complex can catalyze the copolymerization of ethylene and N -acetyl- O -(ω-alkenyl)- l -tyrosine ethyl esters efficiently and the highest catalytic activity was up to 6.86 × 10 4 gP·(molTi) ?1 ·h ?1 . The structures and properties of the obtained copolymers were characterized by FT-IR, ( 1 H) 13 C NMR, GPC, DSC, and water contact angle. The results indicated that the obtained copolymers had a uniformly high average molecular weight of 2.85 × 10 5 g·mol ?1 and a high incorporation ratio of N -acetyl- O -(but-3-enyl)- l -tyrosine ethyl ester of 2.65 mol % within the copolymer chain. The units of the comonomer were isolated within the copolymer chains. The insertion of the polar comonomer into a copolymer chain can effectively improve the hydrophilicity of a copolymer.
机译：通过乙烯基溴（4-溴-1-丁烯，6-溴-1-己烯，8-溴-1）的反应合成了一系列的N-乙酰基-O-（ω-烯基）-1-酪氨酸乙酯-辛烯和10-溴-1-癸烯）与N-乙酰基-1-酪氨酸乙酯。对这些N-乙酰基-O-（ω-烯基）-1-酪氨酸乙酯进行1 H NMR，元素分析，FT-IR和质谱。该新型钛配合物可有效催化乙烯与N-乙酰基-O-（ω-烯基）-1-酪氨酸乙酯的共聚反应，最高催化活性可达6.86×10 4 gP·（molTi）？1·h 1。通过FT-IR，（1 H）13 C NMR，GPC，DSC和水接触角对所得共聚物的结构和性质进行表征。结果表明，所得共聚物具有均匀高的平均分子量2.85×10 5 g·molΔ1和高的N-乙酰基-O-（丁-3-烯基）-1-酪氨酸乙酯的掺入比。在共聚物链内为2.65mol％。共聚单体的单元在共聚物链内分离。极性共聚单体插入共聚物链中可以有效地改善共聚物的亲水性。

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