Drastic morphological modification of polyelectrolyte microcapsules induced by high temperature

Karen Köhler, Dmitry G. Shchukin, Gleb B. Sukhorukov, Helmuth Möhwald

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

Polyelectrolyte multilayer microcapsules of two different sizes consisting of poly(allylamine hydrochloride) and polyfetyrenesulfonate) assembled on melamine formaldehyde cores were investigated by means of scanning (SEM) and transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), and scanning force microscopy (SFM) regarding their stability at temperatures above 100 °C. A pronounced shrinking of the capsules accompanied by a wall thickness increase by more than 10 times was observed after incubating the capsule suspensions in an autoclave at 120 °C for 20 min. An estimation of the capsule wall volume revealed a densification of the polyelectrolyte layers and an exclusion of intercalated water. The gain of entropy resulting from a more coiled and interdigitated state of the polyions as well as from the great decrease of the polyelectrolyte/water interface is considered to be the driving force of this rearrangement process.

Original languageEnglish
Pages (from-to)9546-9550
Number of pages5
JournalMacromolecules
Volume37
Issue number25
DOIs
Publication statusPublished - 14 Dec 2004
Externally publishedYes

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