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

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

Research output: Contribution to journalArticle

59 Citations (Scopus)

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 1H 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 nhexane 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 p-fiT 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-dependent pK values.

Original languageEnglish
Pages (from-to)4289-4301
Number of pages13
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume47
Issue number17
DOIs
Publication statusPublished - Sep 23 2009

Keywords

  • 2-tetrahydropyranyl methacrylate
  • Acationic polymerization
  • Amphiphiles
  • Amphiphilic conetworks
  • Degree of ionization
  • Degree of swelling
  • End-linked conetworks
  • Gels
  • Group transfer polymerization
  • Gtp
  • Living polymerization
  • Methacrylic acid
  • Polyisobutylene
  • Quasiliving carbocationic polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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