Formation and Mechanical Characterization of Aminoplast Core/Shell Microcapsules

Title data

Pretzl, Melanie ; Neubauer, Martin Peter ; Tekaat, Melanie ; Kunert, Carmen ; Kuttner, Christian ; Leon, Géraldine ; Berthier, Damien ; Erni, Philipp ; Ouali, Lahoussine ; Fery, Andreas:
Formation and Mechanical Characterization of Aminoplast Core/Shell Microcapsules.
In: ACS Applied Materials & Interfaces. Vol. 4 (2012) Issue 6 . - pp. 2940-2948.
ISSN 1944-8252
DOI: https://doi.org/10.1021/am300273b

Official URL:

Abstract in another language

This work aims at establishing a link between process conditions and resulting micromechanical properties for aminoplast core/shell microcapsules. The investigated capsules were produced by the in situ polymerization of melamine formaldehyde resins, which represents a widely used and industrially relevant approach in the field of microencapsulation. Within our study, we present a quantitative morphological analysis of the capsules' size and shell thickness. The diameter of the investigated capsules ranged from 10 to 50 mu m and the shell thickness was found in a range between SO and 200 nm. As key parameter for the control of the shell thickness, we identified the amount of amino resin per total surface area of the dispersed phase. Mechanical properties were investigated using small deformations on the order of the shell thickness by atomic force microscopy with a colloidal probe setup. The obtained capsule stiffness increased with an increasing shell thickness from 2 to 30 N/m and thus showed the same trend on the process parameters as the shell thickness. A simple analytical model was adopted to explain the relation between capsules' geometry and mechanics and to estimate the elastic modulus of the shell about 1.7 GPa. Thus, this work provides strategies for a rational design of microcapsule mechanics.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 500 Natural sciences 500 Science > 530 Physics 500 Science > 540 Chemistry
Date Deposited:	05 Dec 2014 10:30
Last Modified:	12 Jan 2023 08:59
URI:	https://eref.uni-bayreuth.de/id/eprint/3966