ANALYSIS OF FORMALDEHYDE COMPOSITION EFFECT ON THE MORPHOLOGY OF POLY (UREA-FORMALDEHYDE) MICROCAPSULE CONTAINING LINSEED OIL

Abstract – Microcapsules technology for smart materials application were developed recently years. One of the smart materials was self-healing coating. The microcapsules containing healing agent are dispersed into a polymeric matrix to form self-healing composite. Additionally, the microcapsules might be incorporated into paint for coating application. The main idea of self-healing coating is to design smart self-healing systems with inherent ability of self-repair. Many studies that have been done proposed several healing stimulus mechanisms. Commonly the capsules shell composed from organic polymers, such as urea-formaldehyde, polyurethane, and melamine formaldehyde. In this research, poly (urea-formaldehyde) (PUF) microcapsules containing linseed oil were synthesized by in-situ polymerization method. The obtained microcapsules were analyzed based on parameter of formaldehyde to urea mass ratio (2, 3, 4, and 5). The result show that the increase of formaldehyde to urea ratio increased the microcapsules shell thickness.