Mechanical properties of polymeric membranes obtained by radiation cast-polymerization of hydroxyalkyl and hydroxypolyethyleneglycol methacrylate monomers

1986 ◽  
Vol 20 (4) ◽  
pp. 521-531 ◽  
Author(s):  
M. Kumakura
Keyword(s):  
Mechanical Properties ◽  
Polymeric Membranes ◽  
Methacrylate Monomers

Fabrication and Characterization of Electrospun Polysulfone (PSF)/Organo-Montmorillonite (O-MMT) Nanostructured Membranes

2018 ◽  
Vol 916 ◽  
pp. 125-129 ◽  
Author(s):  
Ruth R. Aquino ◽  
Marvin S. Tolentino ◽  
Joren V. Angeles ◽  
Hershey Azelle Millano
Keyword(s):  
Mechanical Properties ◽  
Fiber Diameter ◽  
Polymeric Membranes ◽  
Fiber Morphology ◽  
Ft Ir ◽  
Ir Analysis ◽  
Fabrication And Characterization ◽  
Nanostructured Membranes ◽  
Mmt Clay

Polymeric membranes infused with clays have attracted researchers for it poses a great potential in water treatment applications. In this study, polysulfone (PSF) has been infused with organo-montmorillonite (O-MMT) clay to fabricate membranes through electrospinning and were subjected into different characterizations to find out the effect of adding the clay to the polymer.Four sampleswith different amounts of O-MMT have been fabricated (Pure PSF, 1% O-MMT, 3% O-MMT and 5% O-MMT). The fiber morphology, fiber diameter,surface chemical composition, hydrophobicity, and mechanical properties of these samples were studied. Preliminary investigationhas revealed that shallow pores and smaller fiber diameter were formed with increasing O-MMT concentration. Molecular interaction between the PSF and O-MMT was also revealed through the FT-IR analysis. With regards to contact angle, there are no significant differences between the measurements for each PSF/O-MMT blend. Improvements in the mechanical properties of the samples were also observed as the O-MMT concentration increases.

scholarly journals Polylactide-Based Stent Coatings: Biodegradable Polymeric Coatings Capable of Maintaining Sustained Release of the Thrombolytic Enzyme Prourokinase

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4107 ◽  
Author(s):  
Alexander S. Baikin ◽  
Alexey G. Kolmakov ◽  
Lyudmila A. Shatova ◽  
Elena O. Nasakina ◽  
Mars G. Sharapov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
De Novo ◽  
Water Solution ◽  
Polymeric Membranes ◽  
Polymeric Coatings ◽  
Thrombolytic Activity ◽  
Connective Tissue Capsule ◽  
Relative Extension ◽  
Large Molecular Weight ◽  
Acute Toxic Effect

The novelty of the study is the development, creation, and investigation of biodegradable polymeric membranes based on polylactide, that are capable of directed release of large molecular weight biomolecules, particularly, prourokinase protein (MW = 46 kDa). Prourokinase is a medication with significant thrombolytic activity. The created membranes possess the required mechanical properties (relative extension value from 2% to 10%, tensile strength from 40 to 85 MPa). The membranes are biodegradable, but in the absence of living cells in a water solution they decompose by less than 10% in half a year. The created membranes are capable of controlled prourokinase release into intercellular space, and the total enzymatic activity of prourokinase does not decrease by more than 12%. The daily release of prourokinase from one square centimeter of the membrane ranges from 1 to 40 μg per day depending on the technique of membrane preparation. The membranes have no acute toxic effect on cells accreting these surfaces de novo. The number of viable cells is at least 96%−97% of the overall cell count. The mitotic index of the cells growing on the surface of the polymeric films comprised around 1.5%. Histological examination did not reveal any disorders in tissues of the animals after the implantation of polymer membranes based on polylactide, both alone and as components of stent cover. Implantation of stents covered with prourokinase-containing polymers led to the formation of a mature connective tissue capsule that is thicker than in the case of uncovered stents. Thus, various polylactide-based biodegradable polymeric membranes possessing the required mechanical properties and capable of prolonged and directed release of prourokinase macromolecules are developed and investigated in the study.

scholarly journals Assessment of the Gas Permeation through Thin Coated Polymeric Membranes; Improvement of the Gas Barrier Ability for Hydrogen Storage

2012 ◽  
Vol 323-325 ◽  
pp. 393-399 ◽  
Author(s):  
David Chapelle ◽  
Li Ping Feng ◽  
Philippe Nardin ◽  
Jean Yves Rauch
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Coating Thickness ◽  
Gas Permeation ◽  
Polymeric Membranes ◽  
Thin Coating ◽  
Gas Barrier ◽  
Thin Coatings ◽  
Order Of Magnitude ◽  
Permeation Test

We investigate and simulate the permeation behavior of PET membranes on which thin coatings are deposited. Depending on the parameters of deposition and on the thin coating thickness, we assume this alteration could make it possible to decrease by one order of magnitude the permeation coefficient. Some specific developments have been necessary, all the more not only a decrease of permeation is expected but also the mechanical strength of the thin coating during severe mechanical loadings. We consequently design devices dedicated to the permeation test but also to the bulge and blister tests which permit to check the mechanical properties of the film and its adhesion on the PET surface. This paper focuses on the permeation test.

Revealing the Surface Effect on Gas Transport and Mechanical Properties in Nonporous Polymeric Membranes in Terms of Surface Free Energy

Langmuir ◽  
2020 ◽  
Vol 36 (43) ◽  
pp. 12911-12921 ◽  
Author(s):  
Tatyana S. Sazanova ◽  
Kseniia V. Otvagina ◽  
Sergey S. Kryuchkov ◽  
Dmitriy M. Zarubin ◽  
Diana G. Fukina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Free Energy ◽  
Surface Free Energy ◽  
Gas Transport ◽  
Surface Effect ◽  
Polymeric Membranes

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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