Morphological Manipulation and Plasticization of the Electrostatic Network in Perfluorosulfonate Ionomers

2004 ◽  
Vol 856 ◽  
Author(s):  
Alan K. Phillips ◽  
Robert B. Moore
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Alkali Metal ◽  
Small Molecule ◽  
Crystalline Material ◽  
Solution Processed ◽  
Morphology And Mechanical Properties

ABSTRACTThe addition of small molecule fluorosurfactants to perfluorosulfonate ionomers has been found to have a profound effect on the morphology and mechanical properties of solution processed membranes. Perfluorooctane sulfonates neutralized with both alkali metal and alkylammonium counterions have been incorporated into solution processed Nafion® membranes. Sodium neutralized fluorosurfactants were found to crystallize during membrane casting leading to the formation of a surface layer of crystalline material.Tetramethylammonium neutralized surfactants behave in a similar fashion with crystallization of the surfactant occurring during casting. The use of large tetrabutylammonium counterions is found to prevent crystallization of the surfactant and create a highly plasticized membrane.

Mechanical Properties of Solution-Processed Small-Molecule Semiconductor Films

2016 ◽  
Vol 8 (18) ◽  
pp. 11649-11657 ◽  
Author(s):  
Daniel Rodriquez ◽  
Suchol Savagatrup ◽  
Eduardo Valle ◽  
Christopher M. Proctor ◽  
Caitlin McDowell ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Small Molecule ◽  
Semiconductor Films ◽  
Solution Processed

The Influence of Ion Implantation on The Near-Surface Mechanical Properties of Ceramics

1990 ◽  
Vol 188 ◽  
Author(s):  
C. J. McHargue ◽  
M. E. O'Hern ◽  
D. L. Joslin
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Surface Layer ◽  
Elastic Modulus ◽  
Ion Implantation ◽  
Crystalline Material ◽  
Specific Structure ◽  
Near Surface ◽  
Crystalline Surface ◽  
Amorphous Surface

ABSTRACTIon implantation of ceramics such as Al2O3 and SiC may produce a highly damaged but crystalline surface layer or an amorphous surface. The specific structure depends upon the implantation parameters. Studies using microindentation techniques show that a crystalline implanted surface has a higher hardness (by 10 to 50%) than the corresponding unimplanted crystal but the elastic modulus is essentially unchanged. The hardness and elastic modulus of amorphous implanted surfaces are less than those of the crystalline material. Estimates of the residual stress have been obtained from microindentation tests.

scholarly journals Analysis of Different Complex Multilayer PACVD Coatings on Nanostructured WC-Co Cemented Carbide

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 823
Author(s):  
Danko Ćorić ◽  
Mateja Šnajdar Musa ◽  
Matija Sakoman ◽  
Željko Alar
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Base Material ◽  
Single Layer ◽  
Production Costs ◽  
Structural Defects ◽  
Cemented Carbides ◽  
Material System ◽  
Tin Coating ◽  
Ticn Coating

The development of cemented carbides nowadays is aimed at the application and sintering of ultrafine and nano-sized powders for the production of a variety of components where excellent mechanical properties and high wear resistance are required for use in high temperature and corrosive environment conditions. The most efficient way of increasing the tribological properties along with achieving high corrosion resistance is coating. Using surface processes (modification and/or coating), it is possible to form a surface layer/base material system with properties that can meet modern expectations with acceptable production costs. Three coating systems were developed on WC cemented carbides substrate with the addition of 10 wt.% Co using the plasma-assisted chemical vapor deposition (PACVD) method: single-layer TiN coating, harder multilayer gradient TiCN coating composed of TiN and TiCN layers, and the hardest multilayer TiBN coating composed of TiN and TiB2. Physical and mechanical properties of coated and uncoated samples were investigated by means of quantitative depth profile (QDP) analysis, nanoindentation, surface layer characterization (XRD analysis), and coating adhesion evaluation using the scratch test. The results confirm the possibility of obtaining nanostructured cemented carbides of homogeneous structure without structural defects such as eta phase or unbound carbon providing increase in hardness and fracture toughness. The lowest adhesion was detected for the single-layer TiN coating, while coatings with a complex architecture (TiCN, TiBN) showed improved adhesion.

Morphology and Mechanical Properties of Nylon-1010-filled Rigid Polyurethane Foams

2004 ◽  
Vol 36 (4) ◽  
pp. 333-349 ◽  
Author(s):  
Bo Yin ◽  
Zhong-Ming Li ◽  
Hui Quan ◽  
Ming-Bo Yang ◽  
Qiu-Ming Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foams ◽  
Rigid Polyurethane Foams ◽  
Nylon 1010 ◽  
Morphology And Mechanical Properties
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