Effect of nucleating agents on crystallinity and properties of poly (lactic acid) (PLA)

Aliotta, Laura; Cinelli, Patrizia; Coltelli, Maria Beatrice; Righetti, Maria Cristina; Gazzano, Massimo; Lazzeri, Andrea

doi:10.1016/j.eurpolymj.2017.04.041

Cited by 139 publications

(107 citation statements)

References 40 publications

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“…As an effective nucleating agent for PLA, talc has less influence on the strength of PLA/talc than carbon fibers. The result is well consistent with what previously reported in literatures, where tensile properties of crystallized PLA were similar to those amorphous neat PLA. The authors attributed the weak linkage between the amorphous and crystalline phase of PLA to this phenomenon .…”

Section: Resultsmentioning

confidence: 99%

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Gao

Zhang

et al. 2019

J of Applied Polymer Sci

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Weak mechanical strength and serious mechanical anisotropy are two key limiting factors for three‐dimensional (3D) parts prepared by fused deposition modeling (FDM) in industrial applications. In this work, we investigated the relationships between mechanical properties and surface quality of FDM parts with the properties of materials used. Three kinds of polylactide (PLA) filaments, composed of the same PLA matrix but different fillers (carbon fibers and talc), were used to prepare FDM specimens. Due to the nature of FDM process, FDM parts exhibited tensile properties weaker and more anisotropic than their injection‐molding counterparts. The presence of fillers affected the tensile properties of FDM parts, especially the degree of mechanical anisotropy. It is found that the interlayer bond governing the mechanical performance of FDM parts was improved since the fillers added in the polymer materials facilitates the molecular diffusion across the bond interface. Also, the surface quality of FDM parts varied with fillers. Neat PLA parts exhibited surface quality superior to the 3D parts printed with composites filaments. This work is believed to provide highlights on the development of polymer composites filament and improvement of mechanical properties of FDM parts. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47824.

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Section: Resultsmentioning

confidence: 99%

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Gao

Zhang

et al. 2019

J of Applied Polymer Sci

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“…e schematics of pulling out, bridging and crack deflection are shown in Figure 7(d). Furthermore, the increase in the crystallinity of PLLA also had a positive effect on their mechanical properties [48]. However, with the CNTs contents further increasing to 1.0 wt.%, they aggregated in the PLLA matrix, thus failing to enhance the mechanical properties of PLLA/CNTs scaffolds.…”

Section: Discussionmentioning

confidence: 99%

Crystallinity and Reinforcement in Poly-L-Lactic Acid Scaffold Induced by Carbon Nanotubes

Wang

Yang

et al. 2019

Advances in Polymer Technology

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Poly-L-Lactic Acid (PLLA) is a bioabsorbable implant material due to its favorable biocompatibility and inherent degradability, while the insufficient mechanical strength hinders its further bone repair application. In present work, carbon nanotubes (CNTs) were introduced into PLLA scaffolds fabricated via selective laser sintering. It was found that the crystallinity of PLLA increased considerably since CNTs could promote the orderly stacking of its molecular chains, thereby improving the mechanical strength of PLLA scaffold. Furthermore, the fracture surface analysis revealed that CNTs acted as a bridge across the cracks and hindered their further expansion. Moreover, CNTs pulled out from the matrix to consume a large amount of fracture energy, which enhanced the resistance to external forces. As a consequence, the compressive strength, Vickers hardness and tensile strength of the scaffold were enhanced by 22.7%, 58.8% and 17.6%, respectively. Besides, the cells exhibited good attachment, spreading and proliferation on the scaffold. This study demonstrated that PLLA/CNTs scaffold was a promising candidate as bone implant.

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“…High mobility of PLA at T g results in random ester bond breakage; i.e., random chain scission and self-catalytic degradation [258]. A range of nucleating agents, including phthalhydrazide [259], cyclodextrin [260], thermoplastic starch [261], cellulose [262], and others, were shown to increase the crystallisation rate, which in turn decreases the mobility of PLA and therefore makes it more heat resistant [263]. The chain motion of the polymer could be also restricted by fibre reinforcements [264], and the already-mentioned blending and compounding.…”

Section: Polylactic Acidmentioning

confidence: 99%

Recent Advances in Bioplastics: Application and Biodegradation

et al. 2020

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The success of oil-based plastics and the continued growth of production and utilisation can be attributed to their cost, durability, strength to weight ratio, and eight contributions to the ease of everyday life. However, their mainly single use, durability and recalcitrant nature have led to a substantial increase of plastics as a fraction of municipal solid waste. The need to substitute single use products that are not easy to collect has inspired a lot of research towards finding sustainable replacements for oil-based plastics. In addition, specific physicochemical, biological, and degradation properties of biodegradable polymers have made them attractive materials for biomedical applications. This review summarises the advances in drug delivery systems, specifically design of nanoparticles based on the biodegradable polymers. We also discuss the research performed in the area of biophotonics and challenges and opportunities brought by the design and application of biodegradable polymers in tissue engineering. We then discuss state-of-the-art research in the design and application of biodegradable polymers in packaging and emphasise the advances in smart packaging development. Finally, we provide an overview of the biodegradation of these polymers and composites in managed and unmanaged environments.

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Effect of nucleating agents on crystallinity and properties of poly (lactic acid) (PLA)

Cited by 139 publications

References 40 publications

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide

Crystallinity and Reinforcement in Poly-L-Lactic Acid Scaffold Induced by Carbon Nanotubes

Recent Advances in Bioplastics: Application and Biodegradation

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