highly active copolymerization of ethylene and n-acetyl-o-(ω-alkenyl)-l-tyrosine ethyl esters catalyzed by titanium complex
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ID: 256965
2016
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Abstract
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. 1H 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 × 104 gP·(molTi)−1·h−1. The structures and properties of the obtained copolymers were characterized by FT-IR, (1H)13C NMR, GPC, DSC, and water contact angle. The results indicated that the obtained copolymers had a uniformly high average molecular weight of 2.85 × 105 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.
| Reference Key |
wang2016polymershighly
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|---|---|
| Authors | ;Jing Wang;Hongming Li;Runcong Zhang;Xianghui Shi;Jianjun Yi;Jian Wang;Qigu Huang;Wantai Yang |
| Journal | Journal of Fluorescence |
| Year | 2016 |
| DOI |
10.3390/polym8030064
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