Interface studies between epoxy and recycled rubber

Sipahi-Saglam, E
Kaynak, Cevdet
Akovali, G
This work covers studies on interfaces between epoxy and recycled rubber used as toughening phase in epoxy resins. Different surface modification techniques were used to improve the compatibility at the interface between the rubber particles and the epoxy matrix. Silane coupling agents, plasma surface modification and acrylic acid/benzoylperoxide were used to enhance the surface properties of rubber particles. Rubber parts of grinded scrap car tyres with a size range of 355-500 mum after surface treatment were mixed with epoxy. This mixture was poured into molds to obtain fracture toughness test specimens. After curing, plain strain fracture toughness tests were performed and the fractured surfaces of the specimens were examined under scanning electron microscope. Fractographic studies indicated that the increase in fracture toughness values were due to the improved interface Leading to crack deflection as the main rubber toughening mechanism. Secondary rubber toughening mechanisms observed were shear deformations and some debonding initiated at the interface.


Modification of epoxy by a liquid elastomer and solid rubber particles
ÇELİKBİLEK, CENGİZ; AKOVALI, GÜNERİ; Kaynak, Cevdet (2004-04-01)
This work covers studies on epoxy resin systems modified with two different rubber phases. The first modification was the use of recycled car tire rubber particles; while in the second one a silicon based liquid elastomer (Tegomer) was mixed with the epoxy resin matrix. In the third method epoxy resin was modified with both solid rubber particles and liquid elastomer together.
A fractographic study on toughening of epoxy resin using ground tyre rubber
Kaynak, Cevdet; Akovali, G. (2001-01-01)
This study is a fractographic examination of epoxy resin modified with scrap car tyre regrinds used as toughening phase. Five different surface treatment techniques, used to improve the compatibility at the interface between the rubber particles and the epoxy matrix, were: oxygen plasma, two silane coupling agents, acrylic acid and acrylic acid/benzoylperoxide mixture. Rubber parts of ground scrap car tyres with a size range of 355-500 mum after surface treatment were mixed with epoxy. This mixture was pour...
Effects of RTM mold temperature and vacuum on the mechanical properties of epoxy/glass fiber composite plates
Kaynak, Cevdet; Isitman, Nihat Ali (2008-08-01)
The purpose of this study is to investigate the effects of mold temperature, application of vacuum at resin exit ports, and initial resin temperature on the mechanical properties of epoxy matrix woven glass fiber reinforced composite specimens produced by resin transfer molding (RTM). For this purpose, six mold temperatures (25, 40, 60, 80, 100, and 120 degrees C), two initial resin temperatures (15 and 28 degrees C), and vacuum (0.03 bar) and without vacuum (similar to 1 bar) conditions are utilized. Speci...
Flexibility improvement of epoxy resin by liquid rubber modification
Kaynak, Cevdet; Tincer, T (2002-09-01)
The objective of this study was to improve the flexibility of diglycidyl ether of bisphenol-A based epoxy resin by using a liquid rubber. For this purpose, hydroxyl terminated polybutadiene (HTPB) was used at two concentrations of 1% and 1.5% by weight. In order to improve compatibility between liquid rubber and epoxy, a silane coupling agent (SCA) was also used. Bending test specimens were moulded by using four different orders of mixing of HTPB with SCA and hardener to investigate the compatibility of HTP...
Synthesis and characterization of waterborne and phosphorus-containing flame retardant polyurethane coatings
Celebi, F; Aras, L; Gündüz, Güngör; Akhmedov, IM (Springer Science and Business Media LLC, 2003-09-01)
Phosphorus-containing flame retardant water-dispersed polyurethane coatings were produced by incorporating different amounts of a phosphorus compound onto the polyurethane main chain. The novel phosphorus containing compound (phosphorus phenyl dihydroxy) was synthesized in three steps using benzaldehyde, pentaerythritol, phenyl phosphonic dichloride, and acetic acid.
Citation Formats
E. Sipahi-Saglam, C. Kaynak, and G. Akovali, “Interface studies between epoxy and recycled rubber,” 2000, Accessed: 00, 2020. [Online]. Available: