Essential nanostructure parameters to govern reinforcement and functionality of poly(lactic) acid nanocomposites with graphene and carbon nanotubes for 3d printing application

Rumiana Kotsilkova*, Evgeni Ivanov, Vladimir Georgiev, Radost Ivanova, Dzhihan Menseidov, Todor Batakliev, Verislav Angelov, Hesheng Xia, Yinghong Chen, Dzmitry Bychanok, Polina Kuzhir, Rosa Di Maio, Clara Silvestre, Sossio Cimmino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Poly(lactic) acid nanocomposites filled with graphene nanoplatelets (GNPs) and multiwall carbon nanotubes(MWCNTs) are studied, varying the filler size, shape, and content within 1.5-12 wt. %. The effects of the intrinsic characteristics of nanofillers and structural organization of nanocomposites on mechanical, electrical, thermal, and electromagnetic properties enhancement are investigated. Three essential rheological parameters are identified, which determine rheology-structure-property relations in nanocomposites: the degree of dispersion, percolation threshold, and interfacial interactions. Above the percolation threshold, depending on the degree of dispersion, three structural organizations are observed in nanocomposites: homogeneous network (MWCNTs), segregated network (MWCNTs), and aggregated structure (GNPs). The rheological and structural parameters depend strongly on the type, size, shape, specific surface area, and functionalization of the fillers. Consequently, the homogeneous and segregated network structures resulted in a significant enhancement of tensile mechanical properties and a very low electrical percolation threshold, in contrast to the aggregated structure. The high filler density in the polymer and the low number of graphite walls in MWCNTs are found to be determinant for the remarkable shielding eciency (close to 100%) of nanocomposites. Moreover, the 2D shaped GNPs predominantly enhance the thermal conductivity compared to the 1D shaped MWCNTs. The proposed essential structural parameters may be successfully used for the design of polymer nanocomposites with enhanced multifunctional properties for 3D printing applications.

Original languageEnglish
Article number1208
JournalPolymers
Volume12
Issue number6
DOIs
Publication statusPublished - 2020 Jun 1
Externally publishedYes

Keywords

  • Aggregated structure
  • Degree of dispersion
  • Electrical and thermal conductivity
  • Electromagnetic shielding
  • Homogeneous network
  • Interfacial interactions
  • Percolation threshold
  • Segregated network
  • Tensile properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

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