Pulsed laser treatments of polyethylene films

Torrisi, L.; Visco, Annamaria; Campo, N.; Caridi, F.

doi:10.1016/j.nimb.2010.05.067

Cited by 30 publications

(18 citation statements)

References 8 publications

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“…Indeed, it was reported that carbon nanomaterials present significantly different cytotoxicity depending on their physicochemical properties, including size, length, shape, and surface area [44][45][46]. The lack of filler coalescence, defined as a consequence of CNF incorporation, suggested the constitution of an improved UHMWPE-based material, in which the absence of debris could favour the slowing down of inflammatory and oxidative stress effects commonly ascribed to these materials [47][48][49][50][51][52].…”

Section: Cytotoxicitymentioning

confidence: 99%

Wear Resistant Nanocomposites Based on Biomedical Grade UHMWPE Paraffin Oil and Carbon Nano-Filler: Preliminary Biocompatibility and Antibacterial Activity Investigation

Catauro

Scolaro

Poggetto³

et al. 2020

Polymers

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In the present paper, we investigate the effectiveness of nanocomposites (composed of ultra-high molecular weight polyethylene (UHMWPE) mixed with carbon nano-filler (CNF) and medical grade paraffin oil (PO), from the biological point of view. Wear measurements were carried out without (air) and with lubricant (distilled water, natural, and artificial lubricant), and antibacterial activity and cytotoxicity were evaluated. The results highlighted that the presence of CNF is important in the nanocomposite formulation because it reduces the wear rate and prevents oxidative degradation during its processing. An amount of 1.0 wt % of CNF is best because it reaches the optimal distribution within the polymeric matrix, resulting in the best wear resistant, bio-active, and anti-bacterial nanocomposite among all investigated samples.

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Section: Cytotoxicitymentioning

confidence: 99%

Wear Resistant Nanocomposites Based on Biomedical Grade UHMWPE Paraffin Oil and Carbon Nano-Filler: Preliminary Biocompatibility and Antibacterial Activity Investigation

Catauro

Scolaro

Poggetto³

et al. 2020

Polymers

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“…Squaraine dyes show a negative solvatochromism ( Fig. 3, top), where a redshift of the absorption maximum is observed with increasing polarity of the solvent: The E T (30) values are used as the measure of solvent polarity and for hexane the E T (30) value 31 kcal mol −1 , 40.7 kcal mol −1 for dichloromethane and 42.2 kcal mol −1 for NMP.…”

Section: Solvent Effectsmentioning

confidence: 99%

“…The coupling between the absorption and fluorescence spectra and the phonons involved can be identified with a Franck–Condon/Huang–Rhys analysis in order to determine some of the phonons that are active in the generation of heat. There are several references, mainly in commercial literature, detailing which semicrystalline polymers are suitable for welding with a laser absorbing dye . As an example, polyethylene is normally not considered suitable to be welded with this technique, whereas it can readily be welded with other techniques such as ultrasonic welding, which leads to the speculation that the transfer of energy from the absorbing dye to polyethylene is not very efficient.…”

Section: Introductionmentioning

confidence: 99%

“…There are several references, mainly in commercial literature, detailing which semicrystalline polymers are suitable for welding with a laser absorbing dye. [26][27][28][29][30][31][32][33][34] As an example, polyethylene is normally not considered suitable to be welded with this technique, whereas it can readily be welded with other techniques such as ultrasonic welding, which leads to the speculation that the transfer of energy from the absorbing dye to polyethylene is not very efficient. Another reason could be the dispersibility or solubility of the dye in the polymer.…”

Section: Introductionmentioning

confidence: 99%

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Laser welding of polymers using unsymmetrical squaraine dyes

Bak

Nielsen

Jeppesen

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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Transmission laser welding of plastic is typically achieved by incorporating a laser absorbing dye into one of the two pieces of plastic one wishes to weld together and mediating the welding process using a laser emitting light at a suitable wavelength. Desirable properties of laser absorbing dyes include: (1) the dye is colorless in the visible region but absorbs strongly in the region at the wavelength where the laser emits, (2) the dye has a good conversion of the energy from the laser to heat, (3) the dye is stable enough to be incorporated into the molten plastic, (4) the dye is soluble in the plastic of choice to give an even distribution in the plastic, and (5) the dye is nontoxic. Here, we explore an alternative approach to achieve laser welding of colorless plastics using a laser dye that is colored, but that can be bleached after the welding process. Nonsymmetrical squaraine dyes were prepared by condensation of squaric acid and two equivalents of various 3,5‐dimethoxy‐N,N‐dialkylanilines. After the incorporation into polyethylene and laser welding, the plastic was bleached either by heat treatment or by irradiation with a high pressure Xe‐lamp giving colorless polyethylene. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2245–2254

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“…They successfully welded polypropylene sheets by diode-laser transmission welding [11] and selected soundness variables for the diode laser welding of polypropylene thermoplastic polymers by experimental and numerical analysis [12]. Also, Torrisi et al characterized the adhesion susceptibility of polyethylene sheet materials [13,14]. The work described indicates that efficient welding of polymer materials is the result Cable carriers are used to support the laser fiber and were mounted such that the fiber is nearly continuously protected.…”

Section: Introductionmentioning

confidence: 99%

Open Source Laser Polymer Welding System: Design and Characterization of Linear Low-Density Polyethylene Multilayer Welds

et al. 2016

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Abstract:The use of lasers to weld polymer sheets provides a means of highly-adaptive and custom additive manufacturing for a wide array of industrial, medical, and end user/consumer applications. This paper provides an open source design for a laser polymer welding system, which can be fabricated with low-cost fused filament fabrication and off-the-shelf mechanical and electrical parts. The system is controlled with free and open source software and firmware. The operation of the machine is validated and the performance of the system is quantified for the mechanical properties (peak load) and weld width of linear low density polyethylene (LLDPE) lap welds manufactured with the system as a function of linear energy density. The results provide incident laser power and machine parameters that enable both dual (two layers) and multilayer (three layers while welding only two sheets) polymer welded systems. The application of these parameter sets provides users of the open source laser polymer welder with the fundamental requirements to produce mechanically stable LLDPE multi-layer welded products, such as heat exchangers.

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Pulsed laser treatments of polyethylene films

Cited by 30 publications

References 8 publications

Wear Resistant Nanocomposites Based on Biomedical Grade UHMWPE Paraffin Oil and Carbon Nano-Filler: Preliminary Biocompatibility and Antibacterial Activity Investigation

Wear Resistant Nanocomposites Based on Biomedical Grade UHMWPE Paraffin Oil and Carbon Nano-Filler: Preliminary Biocompatibility and Antibacterial Activity Investigation

Laser welding of polymers using unsymmetrical squaraine dyes

Open Source Laser Polymer Welding System: Design and Characterization of Linear Low-Density Polyethylene Multilayer Welds

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