Mechanical Characterization of UV Photopolymerized PMMA with Different Photo-Initiator Concentration

Polymethyl methacrylate (PMMA) is one among few known photo-polymeric resin useful in lithography for fabricating structures having better mechanical properties to meet the requirement in electronics and biomedical applications. This study explores the effect of Photo Initiator (PI) concentration and also curing time on strength and hardness of Polymethyl methacrylate (PMMA) obtained by UV photopolymerization of Methyl methacrylate (MMA) monomer. The UV LED light source operating at the wavelength of 364 nm is used with Benzoin Ethyl Ether (BEE) as photo initiator. The curing of PMMA resin is supported with peltier cooling device placed at the bottom of the UV light source. The characterisation study of UV photo cured PMMA is analysed through nano indenter (Agilent Technologies-G200). The current work investigates the influence of PI concentration and curing time in achieving maximum mechanical properties for UV photopolymerized PMMA.

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Injectable non-leaching tissue-mimetic bottlebrush elastomers as an advanced platform for reconstructive surgery

Nature Communications ◽

10.1038/s41467-021-23962-8 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Erfan Dashtimoghadam ◽

Farahnaz Fahimipour ◽

Andrew N. Keith ◽

Foad Vashahi ◽

Pavel Popryadukhin ◽

...

Keyword(s):

Mechanical Properties ◽

Reconstructive Surgery ◽

Biomedical Applications ◽

The Body ◽

Surrounding Tissue ◽

Curing Time ◽

Materials Used ◽

Significant Health

AbstractCurrent materials used in biomedical devices do not match tissue’s mechanical properties and leach various chemicals into the body. These deficiencies pose significant health risks that are further exacerbated by invasive implantation procedures. Herein, we leverage the brush-like polymer architecture to design and administer minimally invasive injectable elastomers that cure in vivo into leachable-free implants with mechanical properties matching the surrounding tissue. This strategy allows tuning curing time from minutes to hours, which empowers a broad range of biomedical applications from rapid wound sealing to time-intensive reconstructive surgery. These injectable elastomers support in vitro cell proliferation, while also demonstrating in vivo implant integrity with a mild inflammatory response and minimal fibrotic encapsulation.

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Synthesis and Mechanical Characterization of Chitosan Threads for Biomedical Applications

Research in Computing Science ◽

10.13053/rcs-148-1-2 ◽

2019 ◽

Vol 148 (1) ◽

pp. 15-23

Author(s):

I. Rodriguez ◽

O. Rivera-Debernardi ◽

A. Rosillo ◽

I. Delgadillo-Holtfort ◽

J. Delgado

Keyword(s):

Biomedical Applications ◽

Mechanical Characterization

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Injectable Non-leaching Tissue-mimetic Bottlebrush Elastomers: A New Platform for Advancing Reconstructive Surgery

10.21203/rs.3.rs-100872/v1 ◽

2020 ◽

Author(s):

Erfan Dashtimoghadam ◽

Farahnaz Fahimipour ◽

Andrew Keith ◽

Foad Vashahi ◽

Pavel Popryadukhin ◽

...

Keyword(s):

Mechanical Properties ◽

Reconstructive Surgery ◽

Biomedical Applications ◽

The Body ◽

Surrounding Tissue ◽

Curing Time ◽

Materials Used ◽

Significant Health

Abstract Current materials used in biomedical devices do not match tissue’s mechanical properties and leach various chemicals into the body. These deficiencies pose significant health risks that are further exacerbated by invasive implantation procedures. Herein, we leverage the brush-like polymer architecture to design and administer minimally invasive injectable elastomers that cure in vivo into leachable-free implants with mechanical properties matching the surrounding tissue. This strategy allows tuning curing time from minutes to hours, which empowers a broad range of biomedical applications from rapid wound sealing to time-intensive reconstructive surgery. These injectable elastomers support in vitro cell proliferation, while also demonstrating in vivo implant integrity with a mild inflammatory response and minimal fibrotic encapsulation.

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Elaboration and Characterization of Active Apple Starch Films Incorporated with Ellagic Acid

Coatings ◽

10.3390/coatings8110384 ◽

2018 ◽

Vol 8 (11) ◽

pp. 384

Author(s):

Juan Tirado-Gallegos ◽

Paul Zamudio-Flores ◽

José Ornelas-Paz ◽

Claudio Rios-Velasco ◽

Guadalupe Olivas Orozco ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Water Vapor ◽

Antioxidant Capacity ◽

Ellagic Acid ◽

Uv Light ◽

Water Vapor Permeability ◽

Vapor Permeability ◽

Starch Films

Apple starch films were obtained from apples harvested at 60, 70, 80 and 90 days after full bloom (DAFB). Mechanical properties and water vapor permeability (WVP) were evaluated. The apple starch films at 70 DAFB presented higher values in the variables of tensile strength (8.12 MPa), elastic modulus (3.10 MPa) and lower values of water vapor permeability (6.77 × 10−11 g m−1 s−1 Pa−1) than apple starch films from apples harvested at 60, 80 and 90 DAFB. Therefore, these films were chosen to continue the study incorporating ellagic acid (EA). The EA was added at three concentrations [0.02% (FILM-EA0.02%), 0.05% (FILM-EA0.05%) and 0.1% (FILM-EA0.1%) w/w] and compared with the apple starch films without EA (FILM-Control). The films were characterized by their physicochemical, optical, morphological and mechanical properties. Their thermal stability and antioxidant capacity were also evaluated. The FILM-Control and FILM-EA0.02% showed a uniform surface, while FILM-EA0.05% and FILM-EA0.1% showed a rough surface and insoluble EA particles. Compared to FILM-Control, EA modified the values of tensile strength, elasticity modulus and elongation at break. The antioxidant capacity increased as EA concentration did. EA incorporation allowed obtaining films with higher antioxidant capacity, capable of blocking UV light with better mechanical properties than film without EA.

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Bio-mechanical characterization of a CAD/CAM PMMA resin for digital removable prostheses

Dental Materials ◽

10.1016/j.dental.2020.11.003 ◽

2020 ◽

Author(s):

Stefano Pagano ◽

Guido Lombardo ◽

Silvia Caponi ◽

Egidia Costanzi ◽

Alessandro Di Michele ◽

...

Keyword(s):

Mechanical Characterization ◽

Cad Cam ◽

Pmma Resin

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Characterization of Medium Density Particleborads Using Agricultural Residues

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1088.656 ◽

2015 ◽

Vol 1088 ◽

pp. 656-659

Author(s):

Ivaldo D. Valarelli ◽

Rosane A.G. Battistelle ◽

Barbara Stolte Bezerra ◽

Luiz A. Melgaço N. Branco ◽

Eduardo Chahud ◽

...

Keyword(s):

Mechanical Properties ◽

Castor Oil ◽

Mechanical Characteristics ◽

Mechanical Characterization ◽

Raw Materials ◽

Construction Materials ◽

Agricultural Residues ◽

Medium Density ◽

Polyurethane Resin

In recent years the production of products derived from wood and bamboo are increasing, due to the search for a more rational exploitation of these raw materials. Amongst these products, the particleboards production combine sustainability and rationality in the use of these materials. In this context, this work has the objective to study the application of alternative raw materials in the manufacture of Medium Density Particleboards (MDP), using residues from industrial processimg of coffee and bamboo. MDP had been produced with particles of giganteus bamboo of the Dendrocalamus species and particle of coffee rind in the intermediate layer of the particleboard, bonded with polyurethane resin based on castor oil. The physical and mechanical characterization was carried out accordingly to NBR 14810-3 (2006). The physical properties evaluated were: of water absorption for 2h and 24h; thickness swallowing for 2h and 24h; density, humidity content. The mechanical properties evaluated were: Tensile strength, static bending (MOR and MOE). The results were compared with NBR 14810-2 (2006) and also with the ANSI A208-1 (1993). The physical performance of these particleboards was below the values recommend by the Brazilian norm. Also the mechanical characteristics are not improve, demonstrating that the inclusion of coffee rind did not benefit the physical characteristics and nor the mechanical ones. However it can be used as construction materials for partitions and ceiling panels.

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Bend and Shear Tests: Suitable Methods for Mechanical Characterization of Laminated Composite Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.901 ◽

2007 ◽

Vol 539-543 ◽

pp. 901-906 ◽

Cited By ~ 1

Author(s):

Fernando Carreño ◽

M. Pozuelo ◽

José A. Jiménez ◽

Oscar A. Ruano

Keyword(s):

Mechanical Properties ◽

Mechanical Characterization ◽

Laminated Composite ◽

Charpy Impact ◽

Impact Behavior ◽

Bond Quality ◽

Shear Tests ◽

Graphical Visualization ◽

Laminated Composite Materials

Bend and shear tests were used to characterize the improvement in impact behavior of various ultrahigh carbon steel laminated composites. These tests turned out to deliver much more useful information about the mechanical properties of the laminates than the Charpy impact tests and were especially interesting for characterization of laminates of very high toughness values. The toughness of the various laminates was controlled by the rolling conditions that determined the quality of the bond and the appearance of delamination by the interfaces. The bend test allows determination of yield and maximum stresses, absorbed energy and permits graphical visualization of layer fracture and delaminations as testing proceeds. The shear test allows mechanical characterization of the bond quality between layers, permitting prediction of possible delaminations, and therefore, the mechanical properties of the layered material.

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Mechanical Characterization of Polymer Nanowires Using MEMS

Materials, Nondestructive Evaluation, and Pressure Vessels and Piping ◽

10.1115/imece2006-14859 ◽

2006 ◽

Cited By ~ 1

Author(s):

B. A. Samuel ◽

Bo Yi ◽

R. Rajagopalan ◽

H. C. Foley ◽

M. A. Haque

Keyword(s):

Mechanical Properties ◽

Tensile Testing ◽

Furfuryl Alcohol ◽

Mechanical Characterization ◽

Uniaxial Tensile ◽

Testing Device ◽

Uniaxial Tensile Testing ◽

Polymer Nanowires

We present results on the mechanical properties of single freestanding poly-furfuryl alcohol (PFA) nanowires (aspect ratio > 50, diameters 100–300 nm) from experiments conducted using a MEMS-based uniaxial tensile testing device in-situ inside the SEM. The specimens tested were pyrolyzed PFA nanowires (pyrolyzed at 800° C).

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The Mechanical Properties of Porcine Coronary Arteries Determined With a Mixed Experimental-Numerical Approach

ASME 2008 Summer Bioengineering Conference, Parts A and B ◽

10.1115/sbc2008-192791 ◽

2008 ◽

Author(s):

Arjen van der Horst ◽

Chantal N. van den Broek ◽

Marcel C. M. Rutten ◽

Frans N. van de Vosse

Keyword(s):

United States ◽

Mechanical Properties ◽

Coronary Arteries ◽

Arterial Wall ◽

Coronary Circulation ◽

Mechanical Characterization ◽

Numerical Approach ◽

The United States ◽

Mechanical Factors

Mechanical characterization of the coronary arterial wall is important for several reasons. Mechanical factors play an important role in the development of atherosclerosis [1]. Atherosclerotic coronary arteries may be treated mechanically with interventions like PTCA and stent implantation, 1265000 PTCA procedures were performed in the United States in 2005 [2]. Furthermore, knowledge of the mechanical properties of the arterial wall is important for modeling of the coronary circulation and explaining its hemodynamics.

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