Coupling of PMMA to the surface of a layered silicate by intercalative polymerization: processes, structure and properties

Nóra Hegyesi, Szabolcs Pongrácz, Richárd T. Vad, Béla Pukánszky

Research output: Contribution to journalArticle

Abstract

Long PMMA chains were successfully attached to the surface of laponite layers through the [2-(acryloil-oxy)-ethyl]-trimethylammonium chloride linker. Grafting was carried out in water and the molecular weight of the grafted polymer changed between 40 and 110 kDa. The amount of PMMA attached to the silicate and the length of the polymer depended on the extent of ion exchange and on the amount of MMA added. The chemical structure of the attached polymer chains was confirmed by FTIR spectroscopy. Thermogravimetry, carried out before and after extraction, proved that most of the polymer was attached to the surface of the silicate. The layer distance of the silicate increased as the result of grafting. Model calculations proved that the polymer chains located inside the galleries are oriented parallel to the surface and two chains are found inside each gallery. The very high surface energy of the silicate leads to this parallel arrangement and the resulting strong interactions decrease the mobility of the chains. The glass transition temperature of the polymer increases while the change in specific heat decreases with decreasing chain length and PMMA amount.

Original languageEnglish
Article number124979
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume601
DOIs
Publication statusPublished - Sep 20 2020

Keywords

  • Gallery structure
  • Grafting
  • Laponite
  • Modeling
  • Molecular weight
  • Nanocomposite
  • PMMA
  • Surface coverage
  • Transparency
  • XRD

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Coupling of PMMA to the surface of a layered silicate by intercalative polymerization: processes, structure and properties'. Together they form a unique fingerprint.

  • Cite this