Processing of poly(lactic acid): Characterization of chemical structure, thermal stability and mechanical properties

Carrasco, F.; Pagès, P.; Gámez‐Pérez, José; Santana, Oliverio J.; Maspoch, M. Ll.

doi:10.1016/j.polymdegradstab.2009.11.045

Cited by 600 publications

(469 citation statements)

References 41 publications

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“…Pure PLA (Fig. 8a) exhibited characteristic peaks at 2θ= 12.5, 14.7, 16.6, 19.1°and 22.3°which coincided with the data published previously [25][26][27]. The main peak at 16.6°c orresponds to interplanar spacing of 5.9 Å [27].…”

Section: X-ray Diffractionsupporting

confidence: 88%

Crosslinked blends of poly(lactic acid) and polyacrylates: AFM, DSC and XRD studies

et al. 2013

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The blends based on poly(lactic acid), (PLA) and polyacrylates (1:1 weight ratio) have been prepared by photopolymerization of three different multifunctional acrylate monomers (pentaerythritol triacrylate, pentaerythritol tetraacrylate and dipentaerythritol pentaacrylate) in matrix of linear PLA. The structure of these systems has been studied by Atomic Force Microscopy (AFM), Differential Scanning Calorimetry (DSC) and X-ray Diffraction (XRD). It was found that the blends are highly crosslinked, rough, heterogeneous and some of them -semicrystalline. The effect of UV-irradiation on surface morphology of obtained mixtures was studied. The viscometry has been applied for measurements of changes of PLA molecular weight resulting of photodegradation. It was shown that blends are much more photostable than pure PLA.

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Section: X-ray Diffractionsupporting

confidence: 88%

Crosslinked blends of poly(lactic acid) and polyacrylates: AFM, DSC and XRD studies

et al. 2013

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“…Secondly, PLA's thermal properties are well suited to 3D printing. A relatively low glass transition temperature of 60 • C and melting point of 153 • C [37] allows printer extrusion temperatures of around 190 • C, easily accessible by all commercial 3D printers. Additionally, a relatively low thermal expansion coefficient of 70 × 10 −6 • C −1 [38] gives negligible warping of printed models and circumvents the need of a heated print bed.…”

Section: Polylactic Acidmentioning

confidence: 99%

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

Squires

Lewis

2018

J Infrared Milli Terahz Waves

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Recent years have seen an influx of applications utilizing 3D printed devices in the terahertz regime. The simplest, and perhaps most versatile, modality allowing this is Fused Deposition Modelling. In this work, a holistic analysis of the terahertz optical, mechanical and printing properties of 17 common and exotic 3D printer filaments used in Fused Deposition Modelling is performed. High impact polystyrene is found to be the best filament, with a useable frequency range of 0.1-1.3 THz, while remaining easily printed. Nylon, polylactic acid and polyvinyl alcohol give the least desirable terahertz response, satisfactory only below 0.5 THz. Interestingly, most modified filaments aimed at increasing mechanical properties and ease of printing do so without compromising the useable terahertz optical window. Abstract Recent years have seen an influx of applications utilizing 3D printed devices in the terahertz regime. The simplest, and perhaps most versatile, modality allowing this is Fused Deposition Modelling. In this work, a holistic analysis of the terahertz optical, mechanical and printing properties of 17 common and exotic 3D printer filaments used in Fused Deposition Modelling is performed. High impact polystyrene is found to be the best filament, with a useable frequency range of 0.1-1.3 THz, while remaining easily printed. Nylon, polylactic acid and polyvinyl alcohol give the least desirable terahertz response, satisfactory only below 0.5 THz. Interestingly, most modified filaments aimed at increasing mechanical properties and ease of printing do so without compromising the useable terahertz optical window.

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“…These grades have different D-lactic monomer contents, 4.25 and 2% respectively [17][18][19][20], and weight average molecular weights, 212 and 207 kDa respectively, assessed by Gel Permeation Chromatography (GPC) [21]. Sheets with both materials were obtained by cast sheet extrusion in a single-screw COLLIN Teach-Line ® E16T extruder (T = 145-200°C, 50 rpm).…”

Section: Experimental Part 21 Materials and Processingmentioning

confidence: 99%

Fracture behavior of quenched poly(lactic acid)

Gámez‐Pérez¹,

Infante²,

Urquiza³

et al. 2011

Express Polym. Lett.

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The effect of a quenching treatment applied on heated cast sheet extruded films of two poly(lactic acid) (PLA)\ud commercial grades, with different optical purities, was studied. The thermal and mechanical properties of the films, as well\ud as their fracture behavior, were assessed by differential scanning calorimetry (DSC), tensile tests, and the essential work of\ud fracture (EWF) approach. The heating-quenching treatment causes a de-aging effect with an increase in the free volume of\ud polymer chains evidenced by a decrease in the glass transition temperature (Tg) and a decrease in the tensile stiffness and\ud yield stress. As a result, there is an abrupt increase in ductility, finding a dramatic change in the fracture behavior, from brittle\ud to ductile. The use of digital image correlation (DIC) of the strain field analysis during fracture testing has allowed relating\ud the decrease on the yield stress promoted by quenching with the crack propagation kinetics. The use of the EWF method\ud to characterize the fracture toughness of PLA has allowed to measure this enhancement on toughness, finding that the specific\ud essential work of fracture (we) and the plastic term (!wp) parameters increased 120% and 1200%, respectively, after\ud the quenching process.Peer ReviewedPostprint (published version

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Processing of poly(lactic acid): Characterization of chemical structure, thermal stability and mechanical properties

Cited by 600 publications

References 41 publications

Crosslinked blends of poly(lactic acid) and polyacrylates: AFM, DSC and XRD studies

Crosslinked blends of poly(lactic acid) and polyacrylates: AFM, DSC and XRD studies

Feasibility and Characterization of Common and Exotic Filaments for Use in 3D Printed Terahertz Devices

Fracture behavior of quenched poly(lactic acid)

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