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      Graphite nanoplatelets-modified PLA/PCL: Effect of blend ratio and nanofiller localization on structure and properties.

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          Abstract

          Structure and properties of poly(lactic acid) (PLA)/poly (ɛ-caprolactone) (PCL) influenced by graphite nanoplatelets (GNP) were studied in dependence on blend composition. Electron microscopy indicates predominant localization of GNP in PCL. GNP-induced changes in viscosity hinder refinement of PCL inclusions, support PCL continuity in the co-continuous system, and lead to reduction of PLA inclusions size without GNP being present at the interface in the PCL-matrix blend. Negligible differences in crystallinity of both phases indicate that mechanical behaviour is mainly influenced by reinforcement and GNP-induced changes in morphology. Addition of 5 parts of GNP leads to ~40% and ~25% increase of stiffness in the PCL- and PLA-matrix systems, respectively, whereas the reinforcing effect is practically eliminated in the co-continuous systems due to GNP-induced lower continuity of PLA which enhances toughness. Impact resistance of the 80/20 blend shows increase with 5 parts content due to synergistic effect of PCL/GNP stacks, whereas minor increase in the blend of the ductile PCL matrix with brittle PLA inclusions is caused by GNP-modification of the component parameters. Results indicate high potential of GNP in preparing biocompatible systems with wide range of structure and properties.

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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
          Jul 2017
          : 71
          Affiliations
          [1 ] Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, 162 06 Praha, Czechia. Electronic address: kelnar@imc.cas.cz.
          [2 ] Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, 162 06 Praha, Czechia.
          Article
          S1751-6161(17)30148-0
          10.1016/j.jmbbm.2017.03.028
          28371700
          be5266a4-0d24-448b-b16a-34457c6e28f1
          History

          Bone tissue engineering,Graphite nanoplatelets,Mechanical properties,Poly (lactic acid),Poly (ɛ-caprolactone),Structure

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