Anionic amphiphilic end-linked conetworks by the combination of quasiliving carbocationic and group transfer polymerizations

Kali, Gergely; Georgiou, Theoni K.; Iván, Béla; Patrickios, Costas S.

Abstract

A series of amphiphilic end-linked conetworks was synthesized by the combination of two "quasiliving" polymerization techniques, quasiliving carbocationic (QLCCP) and group transfer polymerizations (GTP). The hydrophobic monomer was polyisobutylene methacrylate synthesized by the QLCCP of isobutylene and subsequent terminal modification reactions. The hydrophilic monomer was methacrylic acid (MAA) introduced via the polymerization of 2-tetrahydropyranyl methacrylate followed by acid hydrolysis after (co)network formation. The conetwork syntheses were performed by sequential monomer/crosslinker additions under GTP conditions. All the precursors and the extractables from the conetworks were characterized by gel permeation chromatography and H-1 NMR. The resulting polymer conetworks were investigated in terms of their degree of swelling (DS) in aqueous media and in tetrahydrofuran (THF) over the whole range of ionization of the MAA units and in n-hexane for uncharged conetworks. The DSs in water increased with the degree of ionization (DI) of the MAA units and the hydrophilic content in the conetwork, whereas the DSs in THF increased with the reduction of the DI of the MAA units. The effective pK of the MAA units in the conetworks increased from 8.4 to 10.5 with decreasing MAA content. These findings can facilitate the design of similar unique conetworks with adjustable swelling behavior and composition-de pendent pK values. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4289-4301, 2009

Citation

Kali, G., Georgiou, T. K., Iván, B., & Patrickios, C. S. (2009). Anionic amphiphilic end-linked conetworks by the combination of quasiliving carbocationic and group transfer polymerizations. Journal of Polymer Science Part A: Polymer Chemistry, 47(17), 4289-4301. https://doi.org/10.1002/pola.23481

• Journal Article Type: Article
• Acceptance Date: Apr 18, 2009
• Online Publication Date: Jul 21, 2009
• Publication Date: Sep 23, 2009
• Deposit Date: Nov 13, 2014
• Journal: Journal Of Polymer Science Part A-Polymer Chemistry
• Print ISSN: 0887-624X
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 47
• Issue: 17
• Pages: 4289-4301
• DOI: https://doi.org/10.1002/pola.23481
• Keywords: Amphiphiles; Amphiphilic conetworks; Cationic polymerization; Degree of ionization; Degree of swelling; End-linked conetworks; Gels; Group transfer polymerization; GTP; Living polymerization; Methacrylic acid; Polyisobutylene; Quasiliving carbocationic polymerization; 2-tetrahydropyranyl methacrylate poly(ethylene glycol) methacrylate; Zwitterionic block-copolymers raft; Radical polymerization model conetworks; Swelling behavior; 2-(dimethylamino)ethyl methacrylate aqueous-solution star copolymers; DNA adsorption cross-linking
• Public URL: https://hull-repository.worktribe.com/output/462185
• Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/pola.23481