Biologically inspired reinforcement using polydopamine of polymer bound composites

Herman, M.; Liu, C.; Cady, Carl M.; Watkins, Erik B.; Miller, Nathan; Duque, Amanda L.; Yeager, John D.

doi:10.1016/j.compositesb.2023.110563

Cited by 10 publications

(2 citation statements)

References 43 publications

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“…In conclusion, PDA coating enhances the mechanical properties, hydrophilicity, and cell compatibility of 3D-printed objects [64][65][66][67]. Previous studies by Zhang et al [63] and Lin et al [64] suggested that using dopamine as a coating material has a high potential to increase the stiffness of feedstock for 3D printing and probably to address the limitations of natural fiber reinforcement in the polymer composites of biodegradable filaments. As far as the author is aware, there has been no study investigating how the mechanical properties and microstructural behavior of polylactic acid (PLA)-kenaf fiber (KF) composites in fused deposition modeling (FDM) are affected by self-polymerized polydopamine (PDA) coating.…”

Section: Introductionmentioning

confidence: 72%

“…PDA has also been shown to improve the adhesion, toughness, and flexibility of polymers, making them more durable, resistant to wear and tear, and better able to withstand mechanical stress [60,61]. In polymer composites, PDA has also been found to increase the hydrophilicity of polymers and natural fibers [62], making them more compatible with aqueous environments [63].…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Self-Polymerized Polydopamine Coating on Mechanical Properties of Polylactic Acid (PLA)–Kenaf Fiber (KF) in Fused Deposition Modeling (FDM)

Hamat,

Ishak,

Salit

et al. 2023

Polymers

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This research examines the impact of self-polymerized polydopamine (PDA) coating on the mechanical properties and microstructural behavior of polylactic acid (PLA)/kenaf fiber (KF) composites in fused deposition modeling (FDM). A biodegradable FDM model of natural fiber-reinforced composite (NFRC) filaments, coated with dopamine and reinforced with 5 to 20 wt.% bast kenaf fibers, was developed for 3D printing applications. Tensile, compression, and flexural test specimens were 3D printed, and the influence of kenaf fiber content on their mechanical properties was assessed. A comprehensive characterization of the blended pellets and printed composite materials was performed, encompassing chemical, physical, and microscopic analyses. The results demonstrate that the self-polymerized polydopamine coating acted as a coupling agent, enhancing the interfacial adhesion between kenaf fibers and the PLA matrix and leading to improved mechanical properties. An increase in density and porosity was observed in the FDM specimens of the PLA–PDA–KF composites, proportional to their kenaf fiber content. The enhanced bonding between kenaf fiber particles and the PLA matrix contributed to an increase of up to 13.4% for tensile and 15.3% for flexural in the Young’s modulus of PLA–PDA–KF composites and an increase of up to 30% in compressive stress. The incorporation of polydopamine as a coupling agent in the FDM filament composite led to an improvement in tensile, compressive, and flexural stresses and strain at break, surpassing that of pure PLA, while the reinforcement provided by kenaf fibers was enhanced more by delayed crack growth, resulting in a higher strain at break. The self-polymerized polydopamine coatings exhibit remarkable mechanical properties, suggesting their potential as a sustainable material for diverse applications in FDM.

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