Fabrication of outstanding mechanical performance engineered poly (lactic acid)/thermoplastic poly(ester)urethane in-situ nanofiber composites with a large-scale industrial innovation methodology

He, Yue; Fang, Cheng; Xu, Wanhai; Tan, Ling-Cao; Qin, Sen; Yin, Xianze; Feng, Yanhong; Park, Chul; Qu, Jinping

doi:10.1016/j.cej.2023.141371

Cited by 10 publications

(1 citation statement)

References 70 publications

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“…Returning to the discussion on the use of TPU as a toughening agent, He et al , recently demonstrated that the presence of TPU nanofibrils can significantly enhance the tensile toughness and impact strength of PLA sheets. However, one significant oversight in the study was the consideration of whether the PLA composite sheets toughened with TPU nanofibrils could be reprocessed using injection or compression molding for the purpose of isotropization or manufacturing of goods.…”

Section: Introductionmentioning

confidence: 99%

Highly Tough Yet Stiff, Transparent, and Recyclable PMMA Nanocomposites Incorporating TPU Nanofibril Networks with High Thermal Stability and Strong Interfacial Adhesion

Rahman,

Mahmud,

Omranpour

et al. 2024

ACS Appl. Mater. Interfaces

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In this paper, we develop high aspect ratio nanofibrils from a polycaprolactone-based thermoplastic polyurethane (TPU) and evaluate their performance as a toughening agent. Poly(methyl methacrylate) (PMMA) was chosen as the matrix material because of its inherent brittleness and low resistance to sudden shocks and impact. We show that the addition of as little as 3 wt % of TPU nanofibrils with an average diameter of ∼98 nm and very high aspect ratio can significantly improve both the tensile toughness (∼212%) and impact strength (∼40%) of the chosen matrix (i.e., PMMA) without compromising its original strength, stiffness, and transparency. We compare the performance of TPU nanofibrils with TPU spherical particles�the form TPU typically manifests into when melt-mixed with an immiscible polymer. Our findings highlight that the structure of TPU plays a crucial role in determining the critical concentration of TPU needed for the brittle−ductile transition of the matrix. We also provide new and valuable insights into the unique interfacial interaction (i.e., formation of fibrillar bridges) observed between the PMMA matrix and TPU. We also show that the inclusion of 3 wt % of TPU nanofibrils can notably enhance resistance to creep deformation, even at temperatures close to the glass transition temperature of the matrix. Finally, we evaluate recyclability and demonstrate that the composite containing 3 wt % of TPU nanofibrils can be mechanically recycled without losing any properties. The proposed TPU nanofibrils can withstand repeated reprocessing at temperatures up to 190 °C due to their very high melting point and thermal stability. This presents the opportunity for them to be utilized not just with amorphous PMMA, but also with a range of other materials that can be processed at or below this temperature to remarkably improve their toughness without sacrificing strength and stiffness.

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Section: Introductionmentioning

confidence: 99%

Highly Tough Yet Stiff, Transparent, and Recyclable PMMA Nanocomposites Incorporating TPU Nanofibril Networks with High Thermal Stability and Strong Interfacial Adhesion

Rahman,

Mahmud,

Omranpour

et al. 2024

ACS Appl. Mater. Interfaces

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Epitaxial crystallization of polylactic acid on layered zinc phenylphosphonate: Mutual perpendicular rodlike crystals under two lattice matchings

Ding,

Cui,

Liu

2024

J of Applied Polymer Sci

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As a highly effective nucleating agent, layered zinc phenylphosphonate (PPZn) is incorporated into polylactic acid (PLA) to investigate the epitaxial crystallization of PLA on PPZn in this study. The corresponding lattice spacing change, crystalline morphology, and crystalline structure are emphasized to reveal the epitaxial crystallization mechanism. As a result, with the increase of PPZn content and the annealing time, the increasing lattice spacing of PPZn and the formation of mutually perpendicular rodlike crystals are observed through x‐ray diffraction (XRD) and polarized optical micrograph (POM) measurements, implying that the interlayer spacing of PPZn crystals is expanded as the PLA α‐form crystals epitaxially grow on its surface, that is, epitaxial crystallization. To be specific, “edge on” lamellae epitaxial grow on the PPZn crystals along the [010] and [100] directions under two excellent lattice matchings, which possess acceptable mismatching of 0.347% and 7.5%, respectively. With the support of the epitaxial crystallization mechanism, the occurrence of the filamentous structure observed in the fracture morphology of PLA/PPZn composites suggests strong interfacial adhesion between PLA and PPZn, which makes the impact toughness of the PLA/PPZn composites increase by 53.6% compared with pure PLA.

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Immobilized Deep Eutectic Solvent ChCl–2ZnCl2@ZIF-8 Composite as an Efficient and Reusable Catalyst for the Methanolysis of Poly(lactic Acid)

Zhu,

Zhao,

Wang

et al. 2024

J Polym Environ

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Fabrication of outstanding mechanical performance engineered poly (lactic acid)/thermoplastic poly(ester)urethane in-situ nanofiber composites with a large-scale industrial innovation methodology

Cited by 10 publications

References 70 publications

Highly Tough Yet Stiff, Transparent, and Recyclable PMMA Nanocomposites Incorporating TPU Nanofibril Networks with High Thermal Stability and Strong Interfacial Adhesion

Highly Tough Yet Stiff, Transparent, and Recyclable PMMA Nanocomposites Incorporating TPU Nanofibril Networks with High Thermal Stability and Strong Interfacial Adhesion

Epitaxial crystallization of polylactic acid on layered zinc phenylphosphonate: Mutual perpendicular rodlike crystals under two lattice matchings

Immobilized Deep Eutectic Solvent ChCl–2ZnCl2@ZIF-8 Composite as an Efficient and Reusable Catalyst for the Methanolysis of Poly(lactic Acid)

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