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Manipulating the properties of coacervated polyelectrolyte microcapsules by chemical crosslinking

Authors :
Jun Feng
Changyou Gao
Feng Wang
Source :
Colloid and Polymer Science. 286:951-957
Publication Year :
2008
Publisher :
Springer Science and Business Media LLC, 2008.

Abstract

The properties of coacervated sodium poly(styrene sulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) microcapsules were manipulated by glutaraldehyde crosslinking at mild conditions. Although the crosslinking took place only between the PAH component, only 10% of PSS was lost from the 2-h crosslinked microcapsules. Significant variation in terms of capsule morphology, diameter, and wall thickness was not found by scanning electron microscopy and scanning force microscopy. Although all the microcapsules were not affected by annealing at 70 °C and incubation in 0.1 M HCl for 2 h, the crosslinked microcapsules indeed showed strong ability to resist osmotic-induced capsule invagination. Also, the 20-min and 2-h crosslinked capsule walls have elasticity modulii of 166 and 200 MPa, respectively, which are both larger than that of the original one (140 MPa). The crosslinked microcapsules also showed good stability in 0.01 M NaOH solution and poorer permeability for a large fluorescent probe.

Details

ISSN :
14351536 and 0303402X
Volume :
286
Database :
OpenAIRE
Journal :
Colloid and Polymer Science
Accession number :
edsair.doi...........b4f0dfe1b0a436fe70360f24efe9c2d1
Full Text :
https://doi.org/10.1007/s00396-008-1853-7