title: Synthesis and characterization of core-shell nanoparticles and their influence on the mechanical behavior of acrylic bone cements.
abstract: Core-shell nanoparticles consisting of polybutyl acrylate (PBA) rubbery core and a polymethyl methacrylate (PMMA) shell, with different core-shell ratios, were synthesized in order to enhance the fracture toughness of the acrylic bone cements prepared with them. It was observed by TEM and SEM that the core-shell nanoparticles exhibited a spherical morphology with ca. 120 nm in diameter and that both modulus and tensile strength decreased by increasing the PBA content; the desired structuring pattern in the synthesized particles was confirmed by DMA. Also, experimental bone cements were prepared with variable amounts (0, 5, 10 and 20 wt.%) of nanoparticles with a core-shell ratio of 30/70 in order to study the influence of these nanostructured particles on the physicochemical, mechanical and fracture properties of bone cements. It was found that the addition of nanostructured particles to bone cements caused a significant reduction in the peak temperature and setting time while the glass transition temperature (Tg) of cements increased with increasing particles content. On the other hand, modulus and strength of bone cements decreased when particles were incorporated but fracture toughness was increased.
authors.affiliation: Centro de Investigación Científica de Yucatán, A.C., Calle 43 No. 130, Col. Chuburná de Hidalgo. C.P. 97200, Mérida, Yucatán, Mexico.
authors.forename: A
authors.initials: A
authors.lastname: Gutiérrez-Mejía
authors.forename: W
authors.initials: W
authors.lastname: Herrera-Kao
authors.forename: S
authors.initials: S
authors.lastname: Duarte-Aranda
authors.forename: M I
authors.initials: MI
authors.lastname: Loría-Bastarrachea
authors.forename: G
authors.initials: G
authors.lastname: Canché-Escamilla
authors.forename: F J
authors.initials: FJ
authors.lastname: Moscoso-Sánchez
authors.forename: J V
authors.initials: JV
authors.lastname: Cauich-Rodríguez
authors.forename: J M
authors.initials: JM
authors.lastname: Cervantes-Uc
mesh_terms: D019245:Compressive Strength; D055119:Elastic Modulus; D004655:Emulsions / Q000737:chemistry; D007840:Latex / Q000737:chemistry; D008422:Materials Testing; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D008970:Molecular Weight; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D058105:Polymerization; D019904:Polymethyl Methacrylate / Q000138:chemical synthesis* / Q000737:chemistry*; D011208:Powders; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: D004655:Emulsions; D007840:Latex; D011208:Powders; D019904:Polymethyl Methacrylate
keywords: Bone cements; Core–shell nanoparticles; Mechanical properties