Influence of annealing-induced phase separation on the shape memory effect of graphene-based thermoplastic polyurethane nanocomposites

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dc.contributor.authorValim F.C.F.
dc.contributor.authorOliveira G.P.
dc.contributor.authorde Paiva L.B.
dc.contributor.authorAmurin L.G.
dc.contributor.authorSantillo C.
dc.contributor.authorLavorgna M.
dc.contributor.authorAndrade R.J.E.
dc.date.accessioned2024-03-12T19:07:12Z
dc.date.available2024-03-12T19:07:12Z
dc.date.issued2024
dc.description.abstract© 2023 Wiley Periodicals LLC.Thermoplastic polyurethane (TPU) is a multiblock copolymer that exhibits an attractive shape memory effect (SME). Its morphology consists of a soft segment (SS), which corresponds to the polyol or a long-chain diol, while the hard segment involves the intercalation of a diisocyanate and a chain extender. Due to the distinct thermodynamic parameters of each monomer, these segments are not miscible with each other, resulting in a phase-separated structure in their morphology. This structure is characterized by the formation of soft and hard domains (SD and HD), respectively. When incorporating 0.1 wt% of graphene nanoplatelets (GNP) or 0.1 wt% of multilayer graphene oxide (mGO) into the TPU matrix using solution casting process, a contribution to the phase separation of these domains is observed. This phenomenon becomes even more pronounced when graphene-based nanocomposites are subjected to annealing at 110°C for 24 hours, indicating a good interaction between the GO and GNP with the HD and SS, respectively. After annealing, the nanocomposites (TPU + GNP and TPU + mGO) exhibit improved performance in SME, as evidenced by an approximately 9% increase in the shape recovery ratio compared to the nonannealed TPU. Additionally, all nanocomposites maintained a high strain during SME programming, surpassing that of pure TPU, both before and after annealing. This suggests a direct influence of the graphene-based nanoparticles on the shape memory effect.
dc.description.issuenumber1
dc.description.volume141
dc.identifier.doi10.1002/app.54750
dc.identifier.issn1097-4628
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/33952
dc.relation.ispartofJournal of Applied Polymer Science
dc.rightsAcesso Restrito
dc.subject.otherlanguageannealing
dc.subject.otherlanguagegraphene
dc.subject.otherlanguagenanocomposites
dc.subject.otherlanguageshape memory
dc.subject.otherlanguagethermoplastic polyurethane
dc.titleInfluence of annealing-induced phase separation on the shape memory effect of graphene-based thermoplastic polyurethane nanocomposites
dc.typeArtigo
local.scopus.citations2
local.scopus.eid2-s2.0-85173467845
local.scopus.subjectGraphene nanoplatelets
local.scopus.subjectGraphene oxides
local.scopus.subjectLong chains
local.scopus.subjectMultiblock copolymer
local.scopus.subjectMultilayer graphene
local.scopus.subjectShape-memory
local.scopus.subjectShape-memory effect
local.scopus.subjectSoft segments
local.scopus.subjectThermoplastic polyurethane nanocomposites
local.scopus.subjectThermoplastic polyurethanes
local.scopus.updated2025-04-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85173467845&origin=inward
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