Copolymerization of Amino Acid Functionalized Norbornene Monomers. Synthesis of Amphiphilic Block Copolymers Forming Reverse Micelles

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• 作者：Sutthira Sutthasupa ; Fumio Sanda ; Toshio Masuda
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：January 22, 2008
• 年：2008
• 卷：41
• 期：2
• 页码：305 - 311
• 全文大小：207K
• 年卷期：v.41,no.2(January 22, 2008)
• ISSN：1520-5835

文摘

Amino acid derived novel norbornene monomers, N,N'-(exo-bicyclo[2.2.1]hept-5-en-2,3-diyldicarbonyl) bis-L-leucine methyl ester (1) and N,N'-(exo-bicyclo[2.2.1]hept-5-en-2,3-diyldicarbonyl) bis-L-leucine(2) were synthesized and polymerized with Grubbs second generation ruthenium catalyst. The homopolymers,random, and block copolymers with number-average molecular weights ranging from 16 000 to 30 000 wereobtained in good yields. The block copolymers with 1:2 unit ratios of 75:25, 62:38, and 50:50 were soluble inacetone, while the random copolymers with the same ratios were partly insoluble in the solvent. ¹H NMR, contactangle, dynamic light scattering, and atomic force microscopy measurements revealed that the block copolymerform micelles with a diameter around 100 nm in acetone consisting of a hydrophilic core of poly(2) and ahydrophobic shell of poly(1).