Electrical and thermal properties of PLA/CNT composite films

Ceregatti, Thayara; Pecharki, Paloma; Pachekoski, Wagner Maurício; Becker, Daniela; Dalmolin, Carla

doi:10.1590/s1517-707620170003.0197

Cited by 11 publications

(10 citation statements)

References 10 publications

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“…First, PLA and PLA-g-MA were dried at 60 C in a vacuum oven for 12 h before the extrusion process. PLA/PLA-g-MA/ CNT nanocomposites with different contents of PLA-g-MA (0, 1 and 3 wt%) and 1 wt% of CNT 40,41 were processed using an AX Plásticos, model AX16:40DR corotational twin-screw extruder using a temperature profile of 165, 170, 170, 170 and165 C from the first section to the die, with a screw rotation speed of 120 rpm and feeding of 30 rpm. The nanocomposites were pelletized and dried at 60 C in a vacuum oven for 12 h.…”

Section: Effectiveness Of the Compatibilizer Agent In Pla/cnt Nanocmentioning

confidence: 99%

Effectiveness of the preparation of maleic anhydride grafted poly (lactic acid) by reactive processing for poly (lactic acid)/carbon nanotubes nanocomposites

Verginio

Montanheiro

Montagna

et al. 2020

J of Applied Polymer Sci

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An effective strategy to increase the properties of poly (lactic acid) (PLA) is the addition of carbon nanotubes (CNT). In this work, aiming to improve the surface adhesion of PLA and CNT a new compatibilizer agent was prepared by reactive processing, PLA grafted maleic anhydride (PLA‐g‐MA) using benzoyl peroxide and maleic anhydride. The effectiveness of the PLA‐g‐MA as a compatibilizer agent was verified for PLA/PLA‐g‐MA/CNT nanocomposites. PLA and PLA‐g‐MA samples were characterized by Fourier transform infrared spectroscopy (FT‐IR) to confirm the grafting reaction of maleic anhydride on PLA chains and by rheological analysis to prove the changes in the matrix PLA after the graphitization reaction. Thermal (differential scanning calorimetry and thermogravimetric analysis), mechanical tests (Izod impact strength and tensile test), and morphological characterization were used to verify the effect of the compatibilizer agent. The preparation of PLA‐g‐MA by reactive extrusion processing proved satisfactory and the nanocomposites presented good thermal and mechanical properties. The addition of the PLA‐g‐MA also contributed to the greater distribution of CNT and can be used as an alternative for the production of PLA/CNT nanocomposites.

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Section: Effectiveness Of the Compatibilizer Agent In Pla/cnt Nanocmentioning

confidence: 99%

Effectiveness of the preparation of maleic anhydride grafted poly (lactic acid) by reactive processing for poly (lactic acid)/carbon nanotubes nanocomposites

Verginio

Montanheiro

Montagna

et al. 2020

J of Applied Polymer Sci

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“…CNT have exceptional mechanical properties, aspect ratio, electrical and thermal conductivities, and chemical stability. These characteristics make them excellent candidates for the creation of multifunctional materials either in the field of polymer composites or other application [4][5][6][7][8][9][10][11][12][13]. Based on the unique properties of graphene, the graphene-based polymer composites are expected to offer superior mechanical properties, enhanced electrical and thermal conductivity, improved dimensional stability, higher resistance to microcracking, and increased barrier properties above the matrix polymer [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

PLA/Graphene/MWCNT Composites with Improved Electrical and Thermal Properties Suitable for FDM 3D Printing Applications

et al. 2019

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In this study, the structure, electrical and thermal properties of ten polymer compositions based on polylactic acid (PLA), low-cost industrial graphene nanoplates (GNP) and multi-walled carbon nanotubes (MWCNT) in mono-filler PLA/MWCNT and PLA/GNP systems with 0–6 wt.% filler content were investigated. Filler dispersion was further improved by combining these two carbon nanofillers with different geometric shapes and aspect ratios in hybrid bi-filler nanocomposites. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy exhibited uniform dispersion of nanoparticles in a polymer matrix. The obtained results have shown that for the mono-filler systems with MWCNT or GNP, the electrical conductivity increased with decades. Moreover, a small synergistic effect was observed in the GNP/MWCNT/PLA bi-filler hybrid composites when combining GNP and CNT at a ratio of 3% GNP/3% CNT and 1.5% GNP:4.5% CNT, showing higher electrical conductivity with respect to the systems incorporating individual CNTs and GNPs at the same overall filler concentration. This improvement was attributed to the interaction between CNTs and GNPs limiting GNP aggregation and bridging adjacent graphene platelets thus, forming a more efficient network. Thermal conductivity increases with higher filler content; this effect was more pronounced for the mono-filler composites based on PLA and GNP due to the ability of graphene to better transfer the heat. Morphological analysis carried out by electron microscopy (SEM, TEM) and Raman indicated that the nanocomposites present smaller and more homogeneous filler aggregates. The well-dispersed nanofillers also lead to a microstructure which is able to better enhance the electron and heat transfer and maximize the electrical and thermal properties. The obtained composites are suitable for the production of a multifunctional filament with improved electrical and thermal properties for different fused deposition modelling (FDM) 3D printing applications and also present a low production cost, which could potentially increase the competitiveness of this promising market niche.

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“…Trata-se de um polímero sintetizado a partir de fontes renováveis como o açúcar de milho, batata, e cana de açúcar, através de biconversão e polimerização. O PLA dispõe de características interessantes, tais como biocompatibilidade, biodegradabilidade, e absorção biológica, além de boas propriedades mecânicas e de processabilidade, estabilidade térmica e baixo impacto ambiental [13][14][15][16][17]. A resistência à tração do PLA encontra-se em aproximadamente (50 a 70) MPa e o módulo de elasticidade entre (3,0 e 4,0) GPa, dependendo da massa molar e da composição estereoquímica [18,19].…”

Section: Introductionunclassified

Estudo comparativo entre PETG e PLA para Impressão 3D através de caracterização térmica, química e mecânica

et al. 2018

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RESUMO A Impressão 3D baseada em extrusão se popularizou muito nos últimos anos devido ao surgimento de projetos de código aberto e máquinas de baixo custo, que tornaram a tecnologia acessível a todos os níveis de usuários. Paralelamente, novos materiais, em geral filamentos termoplásticos, são inseridos no mercado para aplicação neste tipo de técnica de fabricação, tornando cada vez mais necessário o desenvolvimento de estudos de caraterização experimentais dos materiais para fornecer dados técnicos aos utilizadores. Neste trabalho estudou-se o poli(tereftalato de etileno glicol) (PETG), polímero de recente adoção neste contexto, comparando-o ao poli(ácido lático) (PLA), o mais popular no âmbito da tecnologia. Ambos os materiais foram analisados mecanicamente à tração, através de amostras fabricadas por Impressão 3D variando os ângulos de deposição do material extrudado. Para a mesma análise, visando comparação, foram construídas peças por moldagem por injeção. Os materiais em seu estado inicial filamentar foram avaliados termicamente por TGA e DSC, e quimicamente por FTIR. As duas últimas técnicas de caracterização também foram aplicadas aos polímeros após o processamento por injeção e impressão. Os resultados obtidos mostraram que as propriedades mecânicas à tração dos componentes impressos são fortemente influenciadas pela orientação dos filamentos depositados nas camadas e pela mesoestrutura das peças. O PLA dispõe de superioridade mecânica, maior tensão máxima e elevada rigidez em relação ao PETG, nas amostras injetadas e impressas. O PETG, por sua vez, demostrou ser um material mais resistente à degradação térmica, mais estável termicamente (por não apresentar alterações significativas em seu comportamento térmico após ser processado), e flexível, propriedade esta que o torna muito interessante para aplicações na Impressão 3D. Por fim, a estrutura química molecular dos polímeros foi semelhante à descrita em outros estudos da literatura e pouco alterada pelos processos de fabricação.

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Electrical and thermal properties of PLA/CNT composite films

Cited by 11 publications

References 10 publications

Effectiveness of the preparation of maleic anhydride grafted poly (lactic acid) by reactive processing for poly (lactic acid)/carbon nanotubes nanocomposites

Effectiveness of the preparation of maleic anhydride grafted poly (lactic acid) by reactive processing for poly (lactic acid)/carbon nanotubes nanocomposites

PLA/Graphene/MWCNT Composites with Improved Electrical and Thermal Properties Suitable for FDM 3D Printing Applications

Estudo comparativo entre PETG e PLA para Impressão 3D através de caracterização térmica, química e mecânica

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