Functionalized carbon nanotubes for 3D-printed PLA-nanocomposites: Effects on thermal and mechanical properties

Bortoli, L.S. De; Farias, Roberta De; Mezalira, Daniela Zambelli; Schabbach, Luciana Maccarini; Fredel, Márcio C.

doi:10.1016/j.mtcomm.2022.103402

Cited by 25 publications

(13 citation statements)

References 62 publications

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“…Some studies suggest that the toughness of semicrystalline polymers with rigid inorganics will decrease sharply in comparison with pristine polymer. [ 36 ] In this study, untreated HNTs‐modified PLA conformed to this phenomenon. However, PMMA‐HNTs‐modified PLA has obvious toughening properties.…”

Section: Resultssupporting

confidence: 63%

Preparation of intercalating halloysite by in situ synthesized polymethyl methacrylate and its effects on the crystallization behaviors and mechanical properties of polylactic acid composites

et al. 2022

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Polylactic acid/halloysites (PLA/HNTs) composites with different nanotube contents were prepared by solution blending. Using unmodified HNTs and polymethyl methacrylate intercalated halloysites (PMMA-HNTs), their structures and properties were comparatively investigated. It is found that the glass transition temperature (T g ) of the composites is lower than that of pure PLA.In addition, both HNTs and PMMA-HNTs promoted the crystallization of PLA. However, due to the good dispersion of PMMA-HNTs in the matrix, the crystallinity of PMMA-HNTs-modified PLA is higher than that of HNTsmodified PLA loaded with the same nanoparticles. The study on the mechanical properties of PMMA-HNTs and HNTs-modified PLA composites suggested that when the content of PMMA-HNTs was not higher than 4 wt%, it could simultaneously improve the elongation at break and tensile strength. Thermal stability studies showed that the T 5% and T max of the two composites did not improve significantly, but the amount of carbon residues increased. This study provides a new strategy for modifying HNTs and preparing PLA composites with good comprehensive properties.

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Section: Resultssupporting

confidence: 63%

Preparation of intercalating halloysite by in situ synthesized polymethyl methacrylate and its effects on the crystallization behaviors and mechanical properties of polylactic acid composites

et al. 2022

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“…This temperature was measured from a DSC at 10 °C/min after 2 h of natural ageing at 20 °C, and it is known that for obtaining precise values, slower DSC scans should be used. The heating rate of 10 °C/min is a heating rate that can be easily found in research on PLA from other authors in the literature [ 30 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ] as well as in our previous works [ 15 , 17 , 23 ]. However, notice the difference between the scan at 10 °C and 3 °C in Figure 5 .…”

Section: Resultsmentioning

confidence: 99%

Effects of Accelerating the Ageing of 1D PLA Filaments after Fused Filament Fabrication

2022

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The effects of post-treatment temperature-based methods for accelerating the ageing of PLA were studied on 1D single-PLA filaments after fused filament fabrication (FFF). The goal was to answer the questions whether the PLA can be safely aged—i.e., without degrading—at higher temperatures; at which temperatures, if any; how long it takes for the PLA to fully age at the chosen temperature; and which are the main differences between the material aged at room temperature and the material aged at higher temperatures. We also share other helpful information found. The use of 1D filaments allows for decoupling the variables related to the 3D structure (layer height, raster angle, infill density, and layers adhesion) from the variables solely related to the material (here, we analysed the molecular weight, the molecular orientation, and the crystallinity). 1D PLA filaments were aged at 20, 39, 42, 51, 65, 75, and 80 °C in a water-bath-inspired process in which the hydrolytic degradation of the PLA was minimised for the ageing temperatures of interest. Those temperatures were selected based on a differential scanning calorimetry (DSC) scan of the PLA right after it was printed in order to study the most effective ageing temperature, 39 °C, and highlight possible degradation mechanisms during ageing. The evolution of the thermal and mechanical properties of the PLA filaments at different temperatures was recorded and compared with those of the material aged at room temperature. A DSC scan was used to evaluate the thermal and physical properties, in which the glass transition, enthalpic relaxation, crystallisation, and melting reactions were analysed. A double glass transition was found, and its potential implications for the scientific community are discussed. Tensile tests were performed to evaluate the tensile strength and elastic modulus. The flow-induced molecular orientation, the degradation, the logistic fitting, and the so-called summer effect—the stabilisation of properties at higher values when aged at higher temperatures—are discussed to assess the safety of accelerating the ageing rate and the differences between the materials aged at different temperatures. It was found that the PLA aged at 39 °C (1) reached almost stable properties with just one day of ageing, i.e., the ageing rate accelerated by 875 % for the elastic modulus and by 1635 % for the yield strength; (2) the stable properties were higher than those from the PLA aged at room temperature; and (3) no signs of degradation were identified for the ageing temperature of interest.

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“…162,163 In the case of nanocomposites, mechanical and thermal properties are increased by adding a small percentage of nanometer ampliers. [164][165][166][167][168] The uniform distribution of the amplier phase creates a large interface between the nanometer amplier phase and the matrix ground phase. There are two major challenges to producing a nanocomposite.…”

Section: Polylactic Acid and Graphene Nanocompositesmentioning

confidence: 99%

A review: studying the effect of graphene nanoparticles on mechanical, physical and thermal properties of polylactic acid polymer

2023

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Functionalized carbon nanotubes for 3D-printed PLA-nanocomposites: Effects on thermal and mechanical properties

Cited by 25 publications

References 62 publications

Preparation of intercalating halloysite by in situ synthesized polymethyl methacrylate and its effects on the crystallization behaviors and mechanical properties of polylactic acid composites

Preparation of intercalating halloysite by in situ synthesized polymethyl methacrylate and its effects on the crystallization behaviors and mechanical properties of polylactic acid composites

Effects of Accelerating the Ageing of 1D PLA Filaments after Fused Filament Fabrication

A review: studying the effect of graphene nanoparticles on mechanical, physical and thermal properties of polylactic acid polymer

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