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C. Schoberleitner, V. Archodoulaki, T. Koch, S. Lüftl, M. Werderitsch, G. Kuschnig:
"Developing a Sealing Material: Effect of Epoxy Modification on the Specific Physical and Mechanical Properties";
Talk: 5th International Conference on Structural Analysis of Advanced Materials, Kos, Griechenland; 2013-09-23 - 2013-09-26; in: "ICSAAM 2013, Conference Proceedings", (2013), 12 pages.

To develop a matched sealing material for socket rehabilitation of grey cast iron pipes, an epoxy resin is modified by the addition of different components to improve the flexibility. Therefore, three different modifications are made by adding EPDM rubber powder, reactive liquid polymer (ATBN) and epoxidised modifier. In this paper the effect of the modification method as well as the influence of absorption of water on the mechanical and physical properties is analysed in terms of: tensile strength, modulus of elasticity, adhesion performance, pressure resistance, glass transition temperature and water content. A comparison with neat epoxy shows that the modulus of elasticity and strength decreases for all materials. Unlike to other tested modification methods, the modification with rubber powder did not enhance the flexibility. All materials absorb water and a plasticisation effect arises with further changes of the mechanical and physical properties. The application of the sealant on the grey cast iron leads to a reduction of the strain at break (in comparison to the common tensile test of the pure materials) and has to be evaluated. The main requirement of pressure resistance up to 1 MPa was tested on two chosen materials. Both materials fulfil this requirement.

epoxy; modified epoxy; mechanical and physical properties; water influence