A novel approach to the impact modification of PLA

Ferdinánd, M.; Várdai, Róbert; Móczó, János; Pukánszky, Béla

doi:10.1016/j.engfracmech.2022.108950

Cited by 8 publications

(5 citation statements)

References 64 publications

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“…Most of the fatigue failures occur in the polyurethane material of the lead coating [ 5 ]. In accordance with Qi and Boyce [ 6 ], TPUs are very rate-, time- and hysteresis-dependent [ 7 , 8 ]. Giorgia Scetta et al [ 2 ] evaluated the cyclic fatigue resistance of TPU based on fracture mechanics in the low cycle fatigue region (<104) through experiments and finite element analysis and discussed its fracture toughness and cyclic fatigue threshold.…”

Section: Introductionmentioning

confidence: 56%

Cyclic Deformation and Fatigue Failure Mechanisms of Thermoplastic Polyurethane in High Cycle Fatigue

Wang

Tang

et al. 2023

Polymers

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In this study, the main purpose is to analyze the fatigue failure of thermoplastic polyurethane (TPU) plate under tension-tension load control tests (frequency = 5 Hz, stress ratio = 0.1) and consider the change in hydrogen bond content. The results show that the S-N curve of TPU material shows a downward trend before reaching the fatigue limit (10.25 MPa), and the energy is continuously consumed during the cyclic creep process and undergoes three stages of the hard segment and the soft segment changes. The infrared spectrum study shows that the increase in fatigue life will lead to more physical crosslinking, resulting in the reduction of hydrogen bond content, and the increase in microphase separation, leading to the occurrence of fatigue fracture. In addition, the scanning electron microscope and three-dimensional confocal analysis showed that the crack originated from the aggregation of micropores on the surface of the material and was accompanied by the slip of the molecular chain, the crack propagation direction was at an angle of about 45°.

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Section: Introductionmentioning

confidence: 56%

Cyclic Deformation and Fatigue Failure Mechanisms of Thermoplastic Polyurethane in High Cycle Fatigue

Wang

Tang

et al. 2023

Polymers

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“…In order to ensure that a brittle, rigid filler will not deteriorate, the properties of composites, impact modifiers, plasticizers, and silanes are often used. Impact modifiers enhance the toughness and resilience of PLA-based composites as they disperse within the matrix and absorb energy during mechanical stress [26]. Some of the most widely used for PLA are poly(ethylene terephthalate) and poly(vinyl alcohol) fibers [26].…”

Section: Introductionmentioning

confidence: 99%

“…Impact modifiers enhance the toughness and resilience of PLA-based composites as they disperse within the matrix and absorb energy during mechanical stress [26]. Some of the most widely used for PLA are poly(ethylene terephthalate) and poly(vinyl alcohol) fibers [26]. Plasticizers improve the flexibility and processability of polymers, as they increase the mobility of polymer chains, thereby reducing T g and enhancing flexibility [27].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Silica Filler as Reinforcement Material of Polylactic Acid (PLA) in 3D Printing Applications: Thermal, Rheological, and Mechanical Performance

Stratiotou Efstratiadis,

Argyros,

Efthymiopoulos

et al. 2024

Polymers

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Glass was introduced as an additive to filaments used for the manufacturing of composite materials, employed by Additive Manufacturing applications. Glass accounts for a large waste electric and electronic equipment (WEEE) percentage, and its recovery and recycling can lead to the production of sustainable composite materials. In this work, poly(lactic acid) (PLA)/commercially available silicon oxide composite filaments were manufactured and their structural, thermal, rheological, and mechanical properties were assessed. Scanning Electron Microscopy confirmed the 1:2 ratio of silicon: oxygen, along with the relatively low adhesion between the filler and the matrix. Differential Scanning Calorimetry presented steady glass transition and melting temperatures of composites, whereas a crystallization temperature of 10% wt. and a crystallinity of 15% wt. composite slightly increased. Rheological analysis showcased that the viscosity of the composite filaments decreased compared to PLA (10–100 compared to 300–400 Pa·s), with a more shear-thinning behavior. Dynamic mechanical analysis exhibited increased elastic, flexural moduli, and flexural strength of composites (up to 16, 23, and 11%, respectively), whereas tensile strength and elongation decreased. The affordability of raw materials (with the future introduction of recycled ones) and the minimal processing steps can lead to the potential scaling up of the study.

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“…However, the inherent brittleness and low toughness of PLA limits its application as a bone implant material. Various plasticizers and impact modifiers have been investigated to improve the toughness of PLA. − It has been found that low-molecular-weight plasticizers tend to migrate out of the PLA matrix due to their high mobility within the material. As a result, high-molecular-weight plasticizers such as poly(propylene glycol) (PPG) and poly(ethylene glycol) (PEG), which have lower mobility within PLA, are preferred options .…”

Section: Introductionmentioning

confidence: 99%

Strontium-Substituted Nanohydroxyapatite-Incorporated Poly(lactic acid) Composites for Orthopedic Applications: Bioactive, Machinable, and High-Strength Properties

Shaikh,

Baniasadi,

Mehrotra

et al. 2023

Biomacromolecules

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Traditional metal-alloy bone fixation devices provide structural support for bone repair but have limitations in actively promoting bone healing and often require additional surgeries for implant removal. In this study, we focused on addressing these challenges by fabricating biodegradable composites using poly(lactic acid) (PLA) and strontium-substituted nanohydroxyapatite (SrHAP) via melt compounding and injection molding. Various percentages of SrHAP (5, 10, 20, and 30% w/w) were incorporated into the PLA matrix. We systematically investigated the structural, morphological, thermal, mechanical, rheological, and dynamic mechanical properties of the prepared composites. Notably, the tensile modulus, a critical parameter for orthopedic implants, significantly improved from 2.77 GPa in pristine PLA to 3.73 GPa in the composite containing 10% w/w SrHAP. The incorporation of SrHAP (10% w/w) into the PLA matrix led to an increased storage modulus, indicating a uniform dispersion of SrHAP within the PLA and good compatibility between the polymer and nanoparticles. Moreover, we successfully fabricated screws using PLA composites with 10% (w/w) SrHAP, demonstrating their formability at room temperature and radiopacity when observed under X-ray microtomography (micro-CT). Furthermore, the water contact angle decreased from 93 ± 2° for pristine PLA to 75 ± 3° for the composite containing SrHAP, indicating better surface wettability. To assess the biological behavior of the composites, we conducted in vitro cell-material tests, which confirmed their osteoconductive and osteoinductive properties. These findings highlight the potential of our developed PLA/SrHAP10 (10% w/w) composites as machinable implant materials for orthopedic applications. In conclusion, our study presents the fabrication and comprehensive characterization of biodegradable composites comprising PLA and strontium-substituted nanohydroxyapatite (SrHAP). These composites exhibit improved mechanical properties, formability, and radiopacity while also demonstrating desirable biological behavior. Our results suggest that these PLA/SrHAP10 composites hold promise as machinable implant materials for orthopedic applications.

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A novel approach to the impact modification of PLA

Cited by 8 publications

References 64 publications

Cyclic Deformation and Fatigue Failure Mechanisms of Thermoplastic Polyurethane in High Cycle Fatigue

Cyclic Deformation and Fatigue Failure Mechanisms of Thermoplastic Polyurethane in High Cycle Fatigue

Utilization of Silica Filler as Reinforcement Material of Polylactic Acid (PLA) in 3D Printing Applications: Thermal, Rheological, and Mechanical Performance

Strontium-Substituted Nanohydroxyapatite-Incorporated Poly(lactic acid) Composites for Orthopedic Applications: Bioactive, Machinable, and High-Strength Properties

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