Crosslinking of Polylactide by High Energy Irradiation and Photo-Curing

Bednarek, Melania; Borská, Katarína; Kubisa, Przemysław

doi:10.3390/molecules25214919

Cited by 42 publications

(35 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that a lower Young's modulus is shown in the Y60° and Y90° specimens after the UV curing process. The crossing of the line may be caused by the overirradiation of UV light in the low infill density of PLA specimens, which embrittles the material and causes the PLA filaments to fracture easily when tensile stress is applied to specimens [23]. angle, which led to the downtrend of UTS and Young's modulus value [2].…”

Section: Resultsmentioning

confidence: 99%

Effect of Printing Parameters on the Tensile Properties of 3D-Printed Polylactic Acid (PLA) Based on Fused Deposition Modeling

et al. 2021

View full text Add to dashboard Cite

In order to optimize the efficiency of the Fused deposition modeling (FDM) process, this study used polylactic acid (PLA) material under different parameters (the printing angle and the raster angle) to fabricate specimens and to explore its tensile properties. The effect of the ultraviolet (UV) curing process on PLA materials was also investigated. The results showed that the printing and raster angles have a high impact on the tensile properties of PLA materials. The UV curing process enhanced the brittleness and reduced the elongation of PLA material. Different effects were observed on tensile strength and modulus of specimens printed with different parameters after UV curing. The above results will be a great help for researchers who are working to achieve sustainability of PLA materials and FDM technology.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Printing Parameters on the Tensile Properties of 3D-Printed Polylactic Acid (PLA) Based on Fused Deposition Modeling

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The addition of the epoxy led to an increase in the chain length and reduced the mobility of the PLA chain [ 39 ]. The PLA crosslinked structure prevented the formation of inter- and intramolecular interactions of PLA crystallinity [ 40 ]; this resulted in the low crystallinity (0.6–3.6%) of the blends.…”

Section: Resultsmentioning

confidence: 99%

Reaction Mechanism and Mechanical Property Improvement of Poly(Lactic Acid) Reactive Blending with Epoxy Resin

et al. 2021

View full text Add to dashboard Cite

Polylactic acid (PLA) was melt-blended with epoxy resin to study the effects of the reaction on the mechanical and thermal properties of the PLA. The addition of 0.5% (wt/wt) epoxy to PLA increased the maximum tensile strength of PLA (57.5 MPa) to 67 MPa, whereas the 20% epoxy improved the elongation at break to 12%, due to crosslinking caused by the epoxy reaction. The morphology of the PLA/epoxy blends showed epoxy nanoparticle dispersion in the PLA matrix that presented a smooth fracture surface with a high epoxy content. The glass transition temperature of PLA decreased with an increasing epoxy content owing to the partial miscibility between PLA and the epoxy resin. The Vicat softening temperature of the PLA was 59 °C and increased to 64.6 °C for 0.5% epoxy. NMR confirmed the reaction between the -COOH groups of PLA and the epoxy groups of the epoxy resin. This reaction, and partial miscibility of the PLA/epoxy blend, improved the interfacial crosslinking, morphology, thermal properties, and mechanical properties of the blends.

show abstract

“…PLA behavior under irradiation is still debatable, especially at low irradiation doses. Some literature reports found that no changes in structure are detectable, despite the observed effects of the ionizing irradiation on mechanical properties of PLA, or changes have been found only if the applied dose irradiation was up to 60 kGy or higher [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Gamma Irradiation on the PLA-Based Blends and Biocomposites Containing Rosemary Ethanolic Extract and Chitosan

Vasile¹,

Pamfil²,

Zaharescu

et al. 2022

Polymers

View full text Add to dashboard Cite

The irradiation of polymeric materials with ionizing radiation (γ-rays, X-rays, accelerated electrons, ion beams, etc.) may lead to disproportion, hydrogen abstraction, arrangements, degradation, and/or the formation of new bonds. The purpose of this paper is to evaluate the effect of gamma irradiation on some new poly(lactic acid) (PLA)-based blends and biocomposites, which is crucial when they are used for food packaging or medical purposes. The polymeric blends and biocomposites based on PLA and rosemary ethanolic extract (R) and poly(ethylene glycol) (PEG) (20 wt%) plasticized PLA, chitosan (CS) (3–6 wt%) and R (0.5 wt%) biocomposites were subjected to gamma irradiation treatment using three low γ-doses of 10, 20, and 30 kGy. The effect of irradiation was evaluated by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), thermogravimetry (TG), chemiluminescence method (CL), migration studies, and antibacterial activity tests. It was found that in comparison with neat PLA, the gamma irradiation in the oxidative conditions of the PLA-based blends and biocomposites, causes modifications in the structure, morphology, and thermal properties of the materials depending on irradiation dose and the presence of natural additives such as rosemary and chitosan. It was established that under a gamma-irradiation treatment with dose of 10–20 kGy, the PLA materials showed minor changes in structure and properties being suitable for application in packaging and in addition after irradiation with such doses their antimicrobial activity against Escherichia coli, Staphylococcus aureus, and Salmonella typhimurium is improved.

show abstract

Crosslinking of Polylactide by High Energy Irradiation and Photo-Curing

Cited by 42 publications

References 103 publications

Effect of Printing Parameters on the Tensile Properties of 3D-Printed Polylactic Acid (PLA) Based on Fused Deposition Modeling

Effect of Printing Parameters on the Tensile Properties of 3D-Printed Polylactic Acid (PLA) Based on Fused Deposition Modeling

Reaction Mechanism and Mechanical Property Improvement of Poly(Lactic Acid) Reactive Blending with Epoxy Resin

Effect of Gamma Irradiation on the PLA-Based Blends and Biocomposites Containing Rosemary Ethanolic Extract and Chitosan

Contact Info

Product

Resources

About