scholarly journals Surface Perfluoroalkyl Chains Segregation: A Tool for Reducing Calcium Deposits in Medical Grade Poly(Methyl Methacrylate)

2017 ◽  
Vol 08 (02) ◽  
pp. 176-187 ◽  
Author(s):  
Baljit K. Ghatora ◽  
Peter J. S. Foot ◽  
Stephen J. Barton ◽  
Ravtej S. Thatti ◽  
Antonio Papagni ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Calcium Deposits ◽  
Medical Grade

scholarly journals Processing Conditions of a Medical Grade Poly(Methyl Methacrylate) with the Arburg Plastic Freeforming Additive Manufacturing Process

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2677
Author(s):  
Lukas Hentschel ◽  
Frank Kynast ◽  
Sandra Petersmann ◽  
Clemens Holzer ◽  
Joamin Gonzalez-Gutierrez
Keyword(s):  
Additive Manufacturing ◽  
Methyl Methacrylate ◽  
Tensile Properties ◽  
Discharge Rate ◽  
Processing Conditions ◽  
Poly Methyl Methacrylate ◽  
Geometrical Accuracy ◽  
Deposition Parameters ◽  
Chamber Temperature ◽  
Medical Grade

The Arburg Plastic Freeforming process (APF) is a unique additive manufacturing material jetting method. In APF, a thermoplastic material is supplied as pellets, melted and selectively deposited as droplets, enabling the use of commercial materials in their original shape instead of filaments. The medical industry could significantly benefit from the use of additive manufacturing for the onsite fabrication of customized medical aids and therapeutic devices in a fast and economical way. In the medical field, the utilized materials need to be certified for such applications and cannot be altered in any way to make them printable, because modifications annul the certification. Therefore, it is necessary to modify the processing conditions rather than the materials for successful printing. In this research, a medical-grade poly(methyl methacrylate) was analyzed. The deposition parameters were kept constant, while the drop aspect ratio, discharge rate, melt temperatures, and build chamber temperature were varied to obtain specimens with different geometrical accuracy. Once satisfactory geometrical accuracy was obtained, tensile properties of specimens printed individually or in batches of five were tested in two different orientations. It was found that parts printed individually with an XY orientation showed the highest tensile properties; however, there is still room for improvement by optimizing the processing conditions to maximize the mechanical strength of printed specimens.

scholarly journals Sulfur Hexafluoride (SF6) Plasma Treatment of Medical Grade Poly(methyl methacrylate)

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 135
Author(s):  
Stefano Zanini ◽  
Antonio Papagni ◽  
Luca Vaghi ◽  
Baljit Kaur Thatti ◽  
Stephen Barton ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Sulfur Hexafluoride ◽  
Morphological Changes ◽  
Surface Hydrophobicity ◽  
Intraocular Lenses ◽  
Poly Methyl Methacrylate ◽  
Vis Spectroscopy ◽  
Medical Grade

Medical-grade poly(methyl methacrylate) (PMMA) is widely employed in the fabrication of intraocular lenses (IOLs), but suffers from opacification, a postoperative complication that leads to the failure of the implanted intraocular lenses. The opacification occurs when inorganic-based deposits accumulate on the surface of the IOL and are prevalent in hydrophilic materials. Here, the surface of medical-grade PMMA has been fluorinated by sulphur hexafluoride (SF6) plasma treatment to increase surface hydrophobicity thus improving the material lifetime in optical applications. Hydrophobic properties of the treated PMMA were investigated by means of contact angle measurements, while chemical modification was assessed by X-ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflectance Fourier Transform Infrared (ATR/FTIR) spectroscopy. Surface morphological changes due to possible etching effects were investigated by Atomic Force Microscopy (AFM). The transparency of the treated PMMA was assessed by UV/VIS spectroscopy. Finally, the influence of the plasma treatment on the inorganic salts deposition was investigated by immersion in Simulated Aqueous Humour (SAH), followed by XPS analysis. The modified samples showed less deposition on the surface than the unmodified sample, moreover, a decrease of the transmittance in the UV-violet range (300–430 nm) was detected, open the possibility of interesting applications of this treatment for the creation of a UV filter in ophthalmic optical devices.

scholarly journals The Effect of Direct Gas Fluorination on Medical Grade Poly(methyl methacrylate)

2014 ◽  
Vol 04 (04) ◽  
pp. 74-83 ◽  
Author(s):  
Baljit K. Ghatora ◽  
Stephen J. Barton ◽  
Peter J. S. Foot ◽  
Philip Miller Tate
Keyword(s):  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Medical Grade

The Effects of Gamma Irradiation on Medical Grade Poly(Methyl Methacrylate)

2013 ◽  
Vol 21 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Stephen J. Barton ◽  
Peter J. S. Foot ◽  
Philip C. Miller Tate ◽  
Mariko Kishi ◽  
Baljit Ghatora
Keyword(s):  
Methyl Methacrylate ◽  
Gamma Irradiation ◽  
Poly Methyl Methacrylate ◽  
Medical Grade
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