Synthesis of Poly(tetrahydrofuran) Polymacromonomers Having Mixed Branch Segments through Reshuffling in Electrostatic Self-Assembly and Subsequent Covalent Fixation

• Published in: Macromolecules Vol. 32; no. 26; pp. 8816 - 8820
• Main Authors: Oike, Hideaki, Imamura, Hideki, Tezuka, Yasuyuki
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 28.12.1999
• Subjects: Applied sciences; Chemical modifications; Chemical reactions and properties; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; Cation exchange; Self assembly; Graft copolymer; End group; Sodium acrylate polymer; Experimental study; Butyl acrylate copolymer; Tetrahydrofuran polymer; Ring cleavage; Pyrrolidine derivatives; Quaternary ammonium compound; Chemical modification; Tetrahydrofuran copolymer; Preparation; Counter ion; Functional group
• ISSN: 0024-9297; 1520-5835
• DOI: 10.1021/ma991081q

A new polymacromonomer architecture with mixed branch segments of different lengths has been constructed through reshuffling of poly(tetrahydrofuran), poly(THF), segments in an electrostatic self-assembly and subsequent covalent fixation process. Thus, two types of electrostatically self-assembled polymacromonomer precursors 4a and 4b were prepared by the ion-exchange reaction between α-methoxy-ω-(N-phenylpyrrolidinium) poly(THF)s (1a and 1b) (M n = 3000 and 6200, respectively) and a poly(sodium acrylate) (DP = 52), respectively. By reshuffling of different poly(THF) segments in the two polymer precursors, 4a and 4b, a new electrostatically self-assembled precursor, 4[a,b], was obtained. The subsequent heat treatment of 4[a,b] effectively produced a covalently linked polymacromonomer, 5[a,b], having mixed branch segments through the ring-opening reaction of the pyrrolidinium salt groups in 1a and in 1b by carboxylate anions in the backbone poly(acrylate) component.