poly(methyl methacrylate) article 8 Acrylic bone cements 4 Aluminum 4 Bone 4 Bone cement 4 Elastic Modulus 4 Elastic moduli 4 Nanoparticles 4 Polymethyl Methacrylate 4 Polymethyl methacrylates 4 Young modulus 4 aluminum 4 chemistry 4 phase transition 4 : Acrylic bone cement 2 Acrylic monomers 2 Activation energy 2 Ag clusters 2 Ag salts 2 Aluminum-PMMA compounds 2 Anelastic relaxation 2 Animals 2 Barium 2 Barium sulphate nanoparticles 2 Barium sulphates 2 Biocompatibility 2 Biocompatibily 2 Biocompatible Materials 2 Biomechanics 2