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Synergistic effect of silver nanoparticle content on the optical and thermo-mechanical properties of poly(l-lactic acid)/glycerol triacetate blends

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Abstract

Monodispersed silver nanoparticles (Ag-NPs) were synthesized by chemical reduction in aqueous medium and transferred in chloroform to be redispersed in the plasticized matrix of poly(l-lactic acid) (PLA) by melt compounding. PLA nanocomposites were prepared using a combination of Ag-NPs in amounts of 0.01, 0.025, 0.05, 0.075 and 0.1% in weight, with 10 pph (parts per hundred) of glycerol triacetate (GTA) to be characterized by UV–Vis and Fourier transformed infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Optical properties showed that PLA nanocomposites have monodispersed Ag-NPs due to the intense SPR (surface plasmon resonance) absorption band at 414 nm, with a calculated particle size of ~30 nm. The crystallinity is gradually raised at a maximum level (21.1%) compared to the pure PLA (2.3%) and T g drastically decreased from 61 to 36.8 °C when Ag-NPs are incorporated in the plasticized PLA matrix. These results were consistent with the enhanced elastic modulus in DMA analysis, explained from the viewpoint of a good nanofiller dispersion and crystallization behavior, providing a stable and ordered crystal (α-form) in agreement with FTIR and DSC analysis. Finally, the outcomes indicate a synergistic effect between Ag-NPs and the plasticizer GTA, due to the nucleating effect of the monodispersed Ag-NPs and the mobility chain promoted by the plasticizer in the macromolecular arrangement of the PLA.

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Acknowledgements

The authors are grateful to the Eng. Kees Joziasse who provides PLLA from Corbion Purac. The author Salas-Papayanopolos would like to acknowledge the personal support provided by Dr. Shair Karami in the administrative process during the stay of research at Ecole Polytechnique de Montreal. This work was supported by the Consejo Nacional de Ciencia y Tecnología [CONACyT, Grant Number 220989]; the Tecnológico Nacional de México [TNM, project name: Preparación y caracterización de un compuesto base Poli(ácido láctico)/nanopartículas de plata/fibras de carbono funcionalizadas (PLA/NPAg/FC), Grant Number 5719.16-P].

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Authors and Affiliations

  1. División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Cd. Madero, Juventino Rosas y Jesús Urueta, Col. Los Mangos, 89440, Ciudad Madero, Tamps, Mexico

    Homero Salas-Papayanopolos & Ana B. Morales-Cepeda

  2. Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna No. 140, 25294, Saltillo, Coahuila, Mexico

    Saúl Sanchez

  3. Chemical Engineering Department, École Polytechnique de Montréal, Stn Centre-Ville, Montréal, QC, H3C 3A7, Canada

    Pierre G. Lafleur

  4. Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León (UANL), Av. Universidad Cd. Universitaria, 66541, San Nicolás de los Garza, Nuevo León, Mexico

    I. Gomez

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  1. Homero Salas-Papayanopolos
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  2. Ana B. Morales-Cepeda
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  3. Saúl Sanchez
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  4. Pierre G. Lafleur
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  5. I. Gomez
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Correspondence to Ana B. Morales-Cepeda.

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Salas-Papayanopolos, H., Morales-Cepeda, A.B., Sanchez, S. et al. Synergistic effect of silver nanoparticle content on the optical and thermo-mechanical properties of poly(l-lactic acid)/glycerol triacetate blends. Polym. Bull. 74, 4799–4814 (2017). https://doi.org/10.1007/s00289-017-1992-4

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  • DOI: https://doi.org/10.1007/s00289-017-1992-4

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