Porous matrix composites mechanical behavior

The mechanical behavior of porous-matrix composites has been modeled, but the compromises between matrix properties and toughness are not yet fully quantified. Initial estimates indicated that a matrix porosity of 30% is needed for crack deflection within a porous matrix [4, 43]. Subsequent efforts have been aimed at better quantifying the transition between porous and dense CMC failure behavior [44] however, further investigation is essential, especially considering the temperature dependent nature of the porous microstructure. 

Novel conductive composite films have been developed by Kaplin and Qutubuddin [101] using a two-step process microemulsion polymerization to form a porous conductive coating on an electrode followed by electropolymerization of an electroactive monomer such as pyrrole. The porous matrix was prepared by polymerizing an SDS microemulsion containing two monomers, acrylamide and styrene [102], The electropolymerization of pyrrole was performed in an aqueous perchlorate or toluenesulfonate solution. The effects of polymerization potential on the electropolymerization, morphology, and electrochemical properties were reported [101]. The copolymer matrix improves the mechanical behavior of the polypyrrole composite film. 

Novel conductive composite films were developed using a two-step process. The porous film coated on an electrode was prepared by polymerizing a bicontinuous microemulsion containing acrylamide and styrene monomers followed by electropolymerization of pyrrole [55]. The copolymer matrix was found to improve the mechanical behavior of the pyrrole composite film. 

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