Μελέτη επί τόπου πολυμερισμού ουρίας-φορμαλδεΰδης με στόχο την ανάπτυξη συστημάτων αυτοΐασης (self healing)

Πατρίκαλος, Ιωάννης-Παναγιώτης; Patrikalos, Ioannis-Panagiotis

dc.contributor.author	Πατρίκαλος, Ιωάννης-Παναγιώτης	el
dc.contributor.author	Patrikalos, Ioannis-Panagiotis	en
dc.date.accessioned	2020-09-03T09:26:03Z
dc.date.available	2020-09-03T09:26:03Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/51057
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.18755
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Αυτοΐαση	el
dc.subject	Επί τόπου πολυμερισμός	el
dc.subject	Συστήματα αυτοΐασης	el
dc.subject	Ουρία-φορμαλδεΰδη	el
dc.subject	Self-healing	en
dc.subject	Urea	en
dc.subject	Πολυμερή	el
dc.subject	Polymerization	en
dc.subject	Microcapsule	en
dc.subject	Εmulsion	en
dc.title	Μελέτη επί τόπου πολυμερισμού ουρίας-φορμαλδεΰδης με στόχο την ανάπτυξη συστημάτων αυτοΐασης (self healing)	el
heal.type	bachelorThesis
heal.classification	Πολυμερή	el
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2020-02-27
heal.abstract	The development of self-healing systems is a technology that has been studied for many years. This highly promising technology offers autonomous cracks repair and increase the coating service lifetime. In particular, polymeric microcapsule systems that incorporate healing agents and generally microcapsule technology are one of the most important classes of self-healing. The aim of this study is to produce microcapsules of poly (urea-formaldehyde) (PUF) up to 50 μm in size, which contain encapsulated diglycidyl ether bisphenol A (DGEBA) epoxy resin by in situ polymerization. In addition, the effect of various critical parameters has been studied on altering the characteristics of microcapsules such as their morphology, size, encapsulation efficiency and thermal properties. In detail, in a single-step polymerization process, the effect of the amount of resin to be encapsulated on the microcapsule characteristics was examined. Subsequently, the effect of pH reduction was studied, which provided for a coarser surface in the microcapsule shell, the results of which were not particularly encouraging. In addition, maintaining the reduced pH value, the use of a homogenizer during emulsification was tested, which did not in turn lead to positive results. Finally, the last parameter that was modified in the experimental procedure is the increase in the amount of emulsifier to form a more stable emulsion has proved to be a more effective method than previous ones. Various methods were used to characterize the properties of the microcapsules resulting from each process such as optical microscope analysis, laser diffraction mastersizer micro, thermogravimetric analysis , Fourier-transform infrared spectroscopy and scanning electron microscopy. Finally, the storage stability of microcapsules, was also evaluated for different time periods. This study focused on the experiment that was more effective than the others, and the value of encapsulation efficiency was stabilized at 66% while the initial value was 78%.	en
heal.advisorName	Βουγιούκα, Σταματίνα	el
heal.committeeMemberName	Βουγιούκα, Σταματίνα	el
heal.committeeMemberName	Κορδάτος, Κωνσταντίνος	el
heal.committeeMemberName	Καραντώνης, Αντώνης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών. Τομέας Σύνθεσης και Ανάπτυξης Βιομηχανικών Διαδικασιών (IV)	el
heal.academicPublisherID	ntua
heal.numberOfPages	120 σ.
heal.fullTextAvailability	false