By Moussa Karama
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The diversity of fibre-reinforced polymer (FRP) functions in new building, and within the retrofitting of present civil engineering infrastructure, is continuous to develop around the world. in addition, this growth is being matched by advancing study into all points of study and layout. the second one overseas convention on FRP Composites in Civil Engineering (CICE 2004) supplied a world discussion board for the medical neighborhood to switch rules and enhance destiny instructions during this quickly constructing box.
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Additional resources for Advances in structural analysis of advanced materials : selected, peer reviewed papers from the International Conference on Structural Analysis of Advanced Materials (ICSAAM - 2009), September 7-10, 2009, Tarbes, France
In the same time, one can notice that the glassy domain is larger for nanocomposites with unmodified CNT certainly due to the heterogeneity of the dispersion. The glass transition temperatures, measured at the maximum of the loss modulus G’’, and the final storage modulus (Fig. 9) show that the mechanical reinforcement is achieved with the nanocomposites filled with CNT previously dispersed with copolymers. The nanocomposite filled with non modified CNT damages the mechanical properties of the pure epoxy resin.
The width of the G" relaxation at glass transition is significant of the polymer network polymolecularity. During the glass transition, macromolecules are moving. It seems that for the DGEBA network, the polymolecularity is lower than in the melted resin formulation. Concerning the adhesive C, this phenomenon is induced by the different chemical nature and the mobility difference between the DGEBA and the novolac macromolecules due to the important stiffness of the novolac chain backbone. For the adhesive D this phenomenon is the direct consequence of the network polymolecularity formed with two novolac with different functionalities and so two chain lengths.
Storage modulus and glass transition temperature are improved. One can finally conclude that even if adsorbed copolymers facilitate the CNT dispersion inducing improvement of mechanical properties, we have shown, in the present paper, that the grafted copolymers are more efficient for the dispersion of CNT in the epoxy matrix and as a consequence, to improve largely the mechanical properties. : Nature. Vol. 354 (1991), p. , Z. -W. Chou: Composites Science and Technology. Vol. 61 (2001), p. T. and D.
Advances in structural analysis of advanced materials : selected, peer reviewed papers from the International Conference on Structural Analysis of Advanced Materials (ICSAAM - 2009), September 7-10, 2009, Tarbes, France by Moussa Karama