Print Email Facebook Twitter On the healing mechanism of sol-gel derived hybrid materials containing dynamic di-sulfide bonds Title On the healing mechanism of sol-gel derived hybrid materials containing dynamic di-sulfide bonds Author AbdolahZadeh, M. Esteves, A.C.C. Van der Zwaag, S. Garcia Espallargas, S.J. Faculty Aerospace Engineering Department Aerospace Structures & Materials Date 2013-06-16 Abstract Sol-gel technology is increasingly being used in coatings for corrosion protection and adhesion improvement. So far, the self-healing concept in sol-gel coatings has only been approached from extrinsic healing perspective (i.e. use of nano and micro carriers of corrosion inhibitors) [1]. Despite the benefits of this approach, the damaged area remains open to ambient environment. The implementation of intrinsic healing approaches in sol-gel coatings can thus very well complement current extrinsic ones in order to offer more extended corrosion protection. In the present work the intrinsic healing sol-gel hybrid systems containing dynamic disulfide bonds were developed. The ability of developed systems to restore their cohesion at three different temperatures was evaluated, revealing 70ºC as the optimum healing temperature. In order to get a better understanding of the healing mechanisms, dynamic mechanical thermal analysis (DMTA) was complemented by in-situ raman spectroscopy to follow the evolution of the di-sulfide bonds during the healing cycles. Mechanical properties and content of the broken dynamic bonds were found to be the key parameters in the healing performance of the developed systems. Faster healing kinetics at 70ºC disclosed the dominating role of the breaking/re-joining of the dynamic di-sulfide bonds in the healing mechanism. Subject sol-gelself-healingraman spectroscopydynamic mechanical thermal analysis To reference this document use: http://resolver.tudelft.nl/uuid:d8e04908-ce4e-4ef6-82c5-87e220272e6f Publisher Magnel Laboratory for Concrete Research ISBN 9789082073713 Source uuid:3078d20c-2173-4c13-a4d7-106207c78577 Source ICSHM 2013: Proceedings of the 4th International Conference on Self-Healing Materials, Ghent, Belgium, 16-20 June 2013 Part of collection Institutional Repository Document type conference paper Rights (c) 2013 The Author(s) Files PDF AbdolahZadeh_2013.pdf 349.4 KB Close viewer /islandora/object/uuid:d8e04908-ce4e-4ef6-82c5-87e220272e6f/datastream/OBJ/view