Development and Characterization of PLA Composites with High Contents of a Brazilian Refractory Clay and Improved Fire Performance

Rabelo, Letícia Heldt; Munhoz, Rodrigo Amorim; Marini, Juliano; Maestrelli, Sylma Carvalho

doi:10.1590/1980-5373-mr-2021-0444

Cited by 9 publications

(1 citation statement)

References 44 publications

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“…In this way, adding essential oil reduced the interaction betwe Regarding the second DSC heating ramp, the PLA melting temperature (Tm) curve indicates the presence of two stereoisomers of PLA, L-and D-lactic acid. The L (levogyre) and D (dextrogyre) form due to their polarized light effect [32,33]. Thus, the DSC curves, presented in Table 2, show the Tm values for each lactic acid in one of the chiral molecules; the melting temperature (Tm) PLLA is between 130 and 180 • C and that for PDLA is between 190 and 230 • C [31].…”

Section: Mechanical Testsmentioning

confidence: 99%

PLA Films Containing Montmorillonite Nanoclay–Citronella Essential Oil Hybrids for Potential Active Film Formulation

Ferreira,

Farina,

Maia

et al. 2023

Macromol

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This work evaluated the synergistic effect of citronella essential oil (Ct) and montmorillonite (MMT) (called hybrid compound) incorporated in Poly(lactic acid) (PLA) films at different concentrations (3, 10, 15, and 20 wt%). PLA films were characterized using X-ray diffraction, SEM, TGA, and DSC considering their mechanical properties and essential oil migration. XRD analysis showed the effective interaction between MMT and oil. Thermal analysis, SEM, and mechanical tests were essential to understand the saturation point of the PLA composites. Samples with 15% and 20% of Ct showed a crystallinity reduction of 0.5% compared to samples with 3% and 10% of Ct. PLA/MMT–Ct showed a reduction in tensile strength of the order of 16 and 24, correlated to 15% and 20% of the Ct content, respectively, compared to PLA/MMT–Ct3%. Migration tests showed fast oil delivery correlated with high oil concentration, as evidenced using the PLA/MMT–Ct20% sample results, which showed an estimated release of 50% in the first 150 h due to system saturation, and the remaining being released in the last 350 h. Therefore, the migration tests provide an effective Ct concentration range promising for application with active packaging due to the intrinsic antimicrobial properties of Ct.

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Section: Mechanical Testsmentioning

confidence: 99%

PLA Films Containing Montmorillonite Nanoclay–Citronella Essential Oil Hybrids for Potential Active Film Formulation

Ferreira,

Farina,

Maia

et al. 2023

Macromol

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Exploring the influence of graphene incorporation on the characteristics of 3D-printed PLA

Liesenfeld,

Jablonski,

da Silva

et al. 2024

Int J Adv Manuf Technol

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Production and characterization of sustainable biocompatible PLA/walnut shell composite materials

Karagöz

2024

Polym. Bull.

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Various treatments, such as alkaline and silane treatments, are commonly applied to natural fillers before production to enhance their quality, thermal stability, and water absorption capacity and improve the fiber–matrix interface properties. However, these processes are not environmentally friendly and may escalate the production cost of composites due to the need for additional processing steps in mass production. This study delves into the impact of untreated walnut shell (WS) filler material, employed in varying ratios (ranging from 10 to 40%) as a filler, on the mechanical, thermal, morphological, and physical properties of environmentally friendly polylactic acid (PLA) matrix composites. The experimental results highlight a significant decrease in tensile modulus by 28%, tensile strength ranging from 32 to 65%, a decrease in flexural modulus by 22%, and flexural strength ranging from 24 to 58% with varying WS filler ratios. Time-dependent water absorption and increased density were observed. FT-IR analysis indicates structural similarities, while DSC results show minimal effects on glass transition temperature and crystallinity. TGA results reveal reduced thermal stability with increasing WS content. SEM microstructure imaging demonstrates homogeneous WS particle distribution, but higher WS content leads to increased brittleness and diminished resistance properties. In conclusion, this study underscores the importance of balancing sustainability through WS filler ratios while preserving mechanical performance.

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Development and Characterization of PLA Composites with High Contents of a Brazilian Refractory Clay and Improved Fire Performance

Cited by 9 publications

References 44 publications

PLA Films Containing Montmorillonite Nanoclay–Citronella Essential Oil Hybrids for Potential Active Film Formulation

PLA Films Containing Montmorillonite Nanoclay–Citronella Essential Oil Hybrids for Potential Active Film Formulation

Exploring the influence of graphene incorporation on the characteristics of 3D-printed PLA

Production and characterization of sustainable biocompatible PLA/walnut shell composite materials

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