Improvement of wetting and bonding of SiO2 ceramics and urea-urethane elastomer
|Anna Boczkowska 1, Katarzyna Konopka 1, Kamil Babski , Krzysztof J. Kurzydlowski 1|
1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
Ceramic-elastomer composites obtained via infiltration of porous ceramics by urea-urethane elastomers are a new class of materials with significant application opportunities. They combine the ceramic hardness and stiffness with the rubbery entropy-elasticity of elastomers.
The porous SiO2 ceramic was infiltrated by urea-urethane elastomer synthesized by one-shot method from ethylene oligoadipate, 4,4’-diphenylmethane diisocyanate and dicyandiamide. The obtained elastomer contains polar, urea groups and highly polar nitrilimide side-groups in the hard segments. The existence of strong polar groups in every short hard segment influences the ceramic – elastomer adhesion by hydrogen bonds with hydroxyl groups available on the SiO2 surface. The adhesion between ceramic and elastomer could be also improved by addition of coupling agents. Two kinds of coupling agents were used to improve the wetting and adhesion between ceramics and elastomer. The degree of wetting was estimated by the value of contact angle as a function of kind, amount and the way of introducing of coupling agent.
SEM observations of ceramic-elastomer composites showed that the elastomer infiltrated into the pores of ceramic matrix leading to the microstructure with percolation of the elastomer phase. Good infiltration is confirmed by low porosity of the samples. The compression tests of composites revealed that due to good adhesion between ceramics and elastomer the compression strength increases.
Presentation: poster at E-MRS Fall Meeting 2005, Symposium G, by Katarzyna Konopka
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-30 12:55 Revised: 2009-06-07 00:44