Microcapsule based self healing materials (Master thesis)

Κοσαρκλή, Μαρία

In recent years, composite materials have been growing in industrial and commercial scale applications. These materials stand out for their excellent mechanical properties in relation to their weight. To extend the life of the material after a damage, the scientific community has been focusing on methods of healing these materials. One of these techniques is self-healing materials. Inspired from biological organisms, self-healing materials have the characteristic of the almost automatic healing when they suffer some damage e.g. crack. Specifically, for self-healing polymeric matrix materials there are 3 manufacturing methods: 1. Embedding of microcapsules inside the matrix 2. Polymers with intrinsic self-healing properties 3. Construction of vascular networks within the material This thesis focuses on the first manufacturing method of self-healing materials.Precisely, microcapsules were prepared by the method of in situ (direct) emulsion polymerization in 5 different diameter ranges. The aim was to estimate the effect of the diameter on the rate of self-healing. Scanning Electron Microscopy (SEM) applied in order to measure the diameter and estimate the size distribution of each category. In addition, thermal analysis was performed by Thermogravimeter Analysis (TGA) and Differential Scanning Calorimetry (DSC) methods to control the thermal stability of the capsules and to confirm the encapsulation of the resin and solvent respectively.Also, through Raman spectroscopy, their structure was identified. Tapered Double Cantilever Beam (TDCB)and fiber reinforced composites specimens were constructed in order to find the healing efficiency regarding of microcapsule diameter. Furthermore, reference specimens were produced, without the self-healing system, to find the knockdown effect after the incorporation of the self-healing system.
Alternative title / Subtitle: παραμετρική μελέτη συναρτήσει των διαστάσεων
α parametric study regarding capsule size
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών
Subject classification: Σύνθετα υλικά
Keywords: Σύνθετα υλικά
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/28509
Appears in Collections:Διατριβές Μεταπτυχιακής Έρευνας (Masters)

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