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dc.contributor.authorCampos, João M.pt_PT
dc.contributor.authordel Río, Benitopt_PT
dc.contributor.authorLorenzo, Vicentept_PT
dc.contributor.authorAnia, Fernandopt_PT
dc.contributor.authorBarros-Timmons, Anapt_PT
dc.contributor.authorRibeiro, M. Rosáriopt_PT
dc.description.abstractThe full potential of poly(L-lactide) (PLLA) reinforced with graphene oxide, GO, nanocomposites tends to be hindered by aggregation of the nanofillers. In order to promote a good dispersion of GO in the PLLA matrix, polymer grafting techniques have been explored to anchor PLLA onto functionalized GO surface to produce GO-PLLA hybrids. For this purpose, PLLA with a terminal triple bond was synthesized by ring-opening polymerization. By controlling the concentration of monomer to initiator, PLLA samples with three different chain lengths have been prepared and later coupled to azide-functionalized GO using click chemistry. These hybrids were then mixed with commercial PLLA and cast films have been prepared. The ensuing nanocomposite films were studied using Depth Sensing Indentation and the results have shown that PLLA matrix-filler interaction can be modulated by controlling the chain length of PLLA graft. This is a critical point because the enhancement of these interactions provides a stronger matrix-filler interphase which improves the stress transfer between both phases and increases the contribution of the interphase to the stiffening of the nanocomposites. Therefore, it has been proven that judicious functionalization of GO is an effective procedure for improving the strength, the stiffness and the creep resistance of the PLLA composites.pt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FCTM%2F50011%2F2019/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00100%2F2020/PTpt_PT
dc.subjectPolymer-matrix composites (PMCs)pt_PT
dc.subjectMechanical propertiespt_PT
dc.subjectHardness testingpt_PT
dc.titleImprovement of viscoelastic, elastic and plastic properties of Poly(L-lactide)/Graphene Oxide-Graft-Poly(L-lactide) nanocomposites by modulation of grafted chain lengthpt_PT
degois.publication.titleComposites Science and Technologypt_PT
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