Effect of processing parameters on surface hydrophilicity of porous PLA tubes prepared by gas assisted microcellular extrusion foaming technique

Bhati, Pooja; Bhatnagar, Naresh

doi:10.1016/j.matlet.2017.08.076

Cited by 13 publications

(7 citation statements)

References 12 publications

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“…The peak at 755 cm −1 is related to the crystalline part of PLA. The peak at 869 cm −1 represents the C-C stretching and that at 1,750 cm −1 represents the C=O carbonyl stretching (Bhati and Bhatnagar, 2017) (Figure 12).…”

Section: Resultsmentioning

confidence: 99%

Analysis of the influence of polylactic acid (PLA) colour on FDM 3D printing temperature and part finishing

Soares

Finamor

Silva

et al. 2018

RPJ

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Purpose This paper aims to analyse the effect of different polylactic acid (PLA) colours used on fused deposition modelling (FDM), considering the product finishing quality produced with the same process conditions. Design/methodology/approach The methodology adopted was to design a virtual modelling object and three-dimensional (3D) print it with FDM with different PLA colours (natural, green and black), using the same parameters. 3D scanning and scanning electron microscopy was used to analyse the model finishing of each sample. Fourier-transform infrared spectroscopy analysis, thermogravimetric analysis and dynamic mechanical analysis were used to characterize the material and verify if the colour affected its thermal behaviour. Findings Findings showed that different PLA colours lead to distinct 3D printed finishings under the same process conditions. Thermal analysis showed a reason for the printing finishing difference. The degradation temperatures and the glass temperatures vary depending on the PLA colour. This affects the FDM working temperature. Originality/value This study will contribute to improving the finishing quality of 3D printed products by collaborating to the determination of its process conditions.

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Section: Resultsmentioning

confidence: 99%

Analysis of the influence of polylactic acid (PLA) colour on FDM 3D printing temperature and part finishing

Soares

Finamor

Silva

et al. 2018

RPJ

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“…Another problem can be local overheating leading to a decrease in viscosity and finally cell coalescence phenomena. 12,30,31 In our case, the screw speed was classically set at 200 rpm. However, foam was elaborated with a rotational screw speed increased to 500 rpm in order to study the consequences of this parameter on the foam characteristics.…”

Section: Resultsmentioning

confidence: 99%

Development of Copolyamide-66/6 Cross-Linked Foams by a One-Step Reactive Extrusion Process

Auclerc

Sahyoun

Tauleigne

et al. 2019

Ind. Eng. Chem. Res.

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The simultaneous chemical cross-linking and foaming of aliphatic copolyamide by one-step reactive extrusion using a bifunctional trialkoxysilaneimidazoline additive is studied. The aim was to reach efficient melt strength enhancing the cell growth without coalescence. From liquid NMR analyses, the cross-linked foam synthesis was evidenced resulting from both imidazoline ring opening (further reacting with the polyamide carboxylic acid endgroups) and alkoxysilane hydrolysis−condensation reactions (leading to cross-linking reaction and ethanol formation). From these chemical modifications, ethanol concomitantly released lead to the expansion of the cross-linked copolyamide. From the knowledge of this chemical mechanism, various extruder and formulation parameters have been modified and their impact scrutinized to optimize the foam morphology. With our optimized conditions, it was possible to synthesize rigid foam with mean pore size mainly below 90 μm and a density around 0.36 kg•m −3 while reaching reasonable compression properties (normalized modulus at 330 MPa). The maximum cell density obtained was 3 × 10 5 cells•cm −3 .

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“…Higher concentrations of carbonyl group on the BAE tube surface could have contributed to the decrease in the contact angle of the BAE TSs [30].…”

Section: Effect Of Fabrication Methods On Surface Hydrophilicitymentioning

confidence: 99%

Physicochemical characterization and mechanical performance analysis of biaxially oriented PLA/PCL tubular scaffolds for intended stent application

et al. 2020

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Polylactic acid (PLA) and its blends are potential materials for bioresorbable vascular tubular scaffold (TS) manufacturing. The usual method for TS fabrication for intended stent application includes firstly extruding the polymeric tube and then subjected to post-processing operations for tailoring its mechanical properties. In this study, PLA/PCL blend TS was fabricated by using a novel and facile fabrication method, which eliminates the much-needed post-processing operation on the extruded TS. Two different ways were used to extrude the TS for a comparative study; (a) conventional Extrusion process (SE), and (b) novel single-step Biaxial Expansion during Extrusion (BAE). FTIR spectra were used to investigate the detailed physicochemical evaluation of the TS. Mechanical studies show BAE TS exhibits better mechanical performance as compared to SE TS. Also, BAE PLA/PCL blend TS containing 5 wt% PCL withstood higher burst pressure among the tested specimens. The water contact angle (CA) of BAE8% TS is observed to be 71° as compared to 81° for the SE0% TS. Further, BAE PLA/PCL TS scaffolds showed better cell viability by MTT assay as compared to pristine PLA.

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Effect of processing parameters on surface hydrophilicity of porous PLA tubes prepared by gas assisted microcellular extrusion foaming technique

Cited by 13 publications

References 12 publications

Analysis of the influence of polylactic acid (PLA) colour on FDM 3D printing temperature and part finishing

Analysis of the influence of polylactic acid (PLA) colour on FDM 3D printing temperature and part finishing

Development of Copolyamide-66/6 Cross-Linked Foams by a One-Step Reactive Extrusion Process

Physicochemical characterization and mechanical performance analysis of biaxially oriented PLA/PCL tubular scaffolds for intended stent application

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