Enhanced thermal conductivity of <scp>PLA</scp>‐based nanocomposites by incorporation of graphite nanoplatelets functionalized by tannic acid

Lin, Han; Pei, Lixia; Zhang, Lizhi

doi:10.1002/app.46397

Cited by 19 publications

(10 citation statements)

References 49 publications

(57 reference statements)

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“…As expected, the addition of GNP to the polymer matrix turns out to significantly influence the thermal conductivity, with values in the range of 0.78–0.94 W m –1 K –1 . These values are significantly higher compared to results previously reported in the literature for both graphite 32 and graphite nanoplatelets 34 at the same weight percent used in this work. Most interestingly, the thermal conductivity of the nanocomposites strongly depends on the type of initiator, with significantly enhanced thermal conductivities in the presence of stereocomplexed PLLA.…”

Section: Results and Discussioncontrasting

confidence: 76%

Facile and Low Environmental Impact Approach to Prepare Thermally Conductive Nanocomposites Based on Polylactide and Graphite Nanoplatelets

Fina

Colonna

Maddalena

et al. 2018

ACS Sustainable Chem. Eng.

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In this work, the preparation of nanocomposites based on poly(l-lactide) PLLA and graphite nanoplatelets (GNP) was assessed by applying, for the first time, the reactive extrusion (REX) polymerization approach, which is considered a low environmental impact method to prepare polymer systems and which allows an easy scalability. In particular, ad hoc synthesized molecules, constituted by a pyrene end group and a poly(d-lactide) (PDLA) chain (Pyr-d), capable of interacting with the surface of GNP layers as well as forming stereoblocks during the ring-opening polymerization (ROP) of l-lactide, were used. The nanocomposites were synthesized by adding to l-lactide the GNP/initiator system, prepared by dispersing the graphite in the acetone/Pyr-d solution, which was dried after the sonication process. DSC and X-ray diffraction measurements evidenced the stereocomplexation of the systems synthesized by using the pyrene-based initiators, whose extent turned out to depend on the PDLA chain length. All the prepared nanocomposites, including those synthesized starting from a classical initiator, that is, 1-dodecanol, retained similar electrical conductivity, whereas the thermal conductivity was found to increase in the stereocomplexed samples. Preferential localization of stereocomplexed PLA close to the interface with GNP was demonstrated by scanning probe microscopy (SPM) techniques, supporting an important role of local crystallinity in the thermal conductivity of the nanocomposites.

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Section: Results and Discussioncontrasting

confidence: 76%

Facile and Low Environmental Impact Approach to Prepare Thermally Conductive Nanocomposites Based on Polylactide and Graphite Nanoplatelets

Fina

Colonna

Maddalena

et al. 2018

ACS Sustainable Chem. Eng.

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“…The enhancement in intensities was due to the introduction of TA on the one hand and the exfoliation of a few graphene layers from graphite during the preparation process on the other hand. The results showed that the characteristic peaks of TA can be observed also at the TA-G, which suggested that TA was successfully functionalized G by the π–π conjugative effect [52,53].…”

Section: Resultsmentioning

confidence: 99%

Electrical and Thermal Conductivity of Polylactic Acid (PLA)-Based Biocomposites by Incorporation of Nano-Graphite Fabricated with Fused Deposition Modeling

Guo

Ren

et al. 2019

Polymers

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The aim of the study was to improve the electrical and thermal conductivity of the polylactic acid/wood flour/thermoplastic polyurethane composites by Fused Deposition Modeling (FDM). The results showed that, when the addition amount of nano-graphite reached 25 pbw, the volume resistivity of the composites decreased to 108 Ω·m, which was a significant reduction, indicating that the conductive network was already formed. It also had good thermal conductivity, mechanical properties, and thermal stability. The adding of the redox graphene (rGO) combined with graphite into the composites, compared to the tannic acid-functionalized graphite or the multi-walled carbon nanotubes, can be an effective method to improve the performance of the biocomposites, because the resistivity reduced by one order magnitude and the thermal conductivity increased by 25.71%. Models printed by FDM illustrated that the composite filaments have a certain flexibility and can be printed onto paper or flexible baseplates.

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“…TC of PLA-based composites is linearly positively correlated with material density, with pure PLA having low TC for its density and glass fibre-reinforced plastics having high TC relative to density (Tagaki et al, 2002) [35]. The TC of pure PLA is low (between 0.13 and 0.2 W/(m•K)), but very effectively enhanced by the addition of fine carboniferous materials like graphene (Lin et al, 2018) [36]. Chiang et al, (2013) [37] recorded an increase in the TC of epoxy resin from 0.17 W/(m•K) to 0.23 with the addition of 2% BC powder, and a study by Tagaki et al, (2002) [35] showed how adding 60% w/w bamboo fibre to PLA increased its solid phase TC from 0.2 W/(m•K) to 0.34 W/(m•K), with modelling indicating the TC of solid bamboo fibre substrate is greater than 0.34 W/(m•K).…”

Section: Discussion-theoretical Model For Flame-retardant Mechanismmentioning

confidence: 99%

Development of Biodegradable Flame-Retardant Bamboo Charcoal Composites, Part II: Thermal Degradation, Gas Phase, and Elemental Analyses

et al. 2020

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Bamboo charcoal (BC) and aluminum hypophosphite (AHP) singly and in combination were investigated as flame-retardant fillers for polylactic acid (PLA). A set of BC/PLA/AHP composites were prepared by melt-blending and tested for thermal and flame-retardancy properties in Part I. Here, in Part II, the results for differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), X-ray diffraction (XRD), and X-ray photoelectron analysis (XPS) are presented. The fillers either singly or together promoted earlier initial thermal degradation of the surface of BC/PLA/AHP composites, with a carbon residue rate up to 40.3%, providing a protective layer of char. Additionally, BC promotes heterogeneous nucleation of PLA, while AHP improves the mechanical properties and machinability. Gaseous combustion products CO, aromatic compounds, and carbonyl groups were significantly suppressed in only the BC-PLA composite, but not pure PLA or the BC/PLA/AHP system. The flame-retardant effects of AHP and BC-AHP co-addition combine effective gas-phase and condensed-phase surface phenomena that provide a heat and oxygen barrier, protecting the inner matrix. While it generated much CO2 and smoke during combustion, it is not yet clear whether BC addition on its own contributes any significant gas phase protection for PLA.

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Enhanced thermal conductivity of PLA‐based nanocomposites by incorporation of graphite nanoplatelets functionalized by tannic acid

Cited by 19 publications

References 49 publications

Facile and Low Environmental Impact Approach to Prepare Thermally Conductive Nanocomposites Based on Polylactide and Graphite Nanoplatelets

Facile and Low Environmental Impact Approach to Prepare Thermally Conductive Nanocomposites Based on Polylactide and Graphite Nanoplatelets

Electrical and Thermal Conductivity of Polylactic Acid (PLA)-Based Biocomposites by Incorporation of Nano-Graphite Fabricated with Fused Deposition Modeling

Development of Biodegradable Flame-Retardant Bamboo Charcoal Composites, Part II: Thermal Degradation, Gas Phase, and Elemental Analyses

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