The effect of pH on charge, swelling and desorption of the dispersant poly(methacrylic acid) from poly(methyl methacrylate) microcapsules
Artikel i vetenskaplig tidskrift, 2012

Poly(methyl methacrylate) microcapsules have been prepared using the solvent evaporation technique with poly(methacrylic acid) (PMAA) as dispersant. The charge, swelling and desorption of PMAA from the microcapsules after treating the suspension with base have been followed using microelectrophoresis, X-ray photoelectron spectroscopy and quartz crystal microbalance with dissipation monitoring on model PMMA surfaces. Basic treatment of the microcapsule suspension leads to temporary colloidal stability through the introduction of charges on the PMAA chain. However, the increase in charge causes a continuous desorption of PMAA from the microcapsule surface, eventually leading to aggregation. If instead poly(diallyldimethylammonium chloride) is added to the base treated microcapsule suspension, good colloidal stability is obtained.

Poly(methacrylic acid)

Degree of dissociation

Quartz crystal microbalance with dissipation monitoring

X-ray photoelectron spectroscopy

Colloidal stability

Microcapsule

Författare

Markus Andersson Trojer

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

SuMo Biomaterials

Anne Wendel

Chalmers, Kemi- och bioteknik, Polymerteknologi

Krister Holmberg

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Magnus Nydén

SuMo Biomaterials

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Journal of Colloid and Interface Science

0021-9797 (ISSN)

Vol. 375 213-215

Ämneskategorier

Polymerkemi

Fysikalisk kemi

Annan kemi

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Fundament

Grundläggande vetenskaper

DOI

10.1016/j.jcis.2012.02.026