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      Mechanical properties and shape memory effect of 3D-printed PLA-based porous scaffolds.

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          Abstract

          In the present work polylactide (PLA)/15wt% hydroxyapatite (HA) porous scaffolds with pre-modeled structure were obtained by 3D-printing by fused filament fabrication. Composite filament was obtained by extrusion. Mechanical properties, structural characteristics and shape memory effect (SME) were studied. Direct heating was used for activation of SME. The average pore size and porosity of the scaffolds were 700μm and 30vol%, respectively. Dispersed particles of HA acted as nucleation centers during the ordering of PLA molecular chains and formed an additional rigid fixed phase that reduced molecular mobility, which led to a shift of the onset of recovery stress growth from 53 to 57°C. A more rapid development of stresses was observed for PLA/HA composites with the maximum recovery stress of 3.0MPa at 70°C. Ceramic particles inhibited the growth of cracks during compression-heating-compression cycles when porous PLA/HA 3D-scaffolds recovered their initial shape. Shape recovery at the last cycle was about 96%. SME during heating may have resulted in "self-healing" of scaffold by narrowing the cracks. PLA/HA 3D-scaffolds were found to withstand up to three compression-heating-compression cycles without delamination. It was shown that PLA/15%HA porous scaffolds obtained by 3D-printing with shape recovery of 98% may be used as self-fitting implant for small bone defect replacement owing to SME.

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          Author and article information

          Journal
          J Mech Behav Biomed Mater
          Journal of the mechanical behavior of biomedical materials
          Elsevier BV
          1878-0180
          1878-0180
          Apr 2016
          : 57
          Affiliations
          [1 ] National University of Science and Technology "MISIS", 119049, Leninskiy pr. 4, Moscow, Russian Federation. Electronic address: Senatov@misis.ru.
          [2 ] National University of Science and Technology "MISIS", 119049, Leninskiy pr. 4, Moscow, Russian Federation.
          Article
          S1751-6161(15)00454-3
          10.1016/j.jmbbm.2015.11.036
          26710259
          cabe821d-110f-43bd-b6ef-e1b6e7fb0431
          History

          Polymer composite,3D-printingShape memory effect,Scaffold,Polylactide,Hydroxyapatite

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