Kinetic aspects of formation and processing of polycaprolactone polyurethanes in situ from a blocked isocyanate

2018 ◽  
Vol 9 (15) ◽  
pp. 1983-1995 ◽  
Author(s):  
Casey Check ◽  
Balazs Imre ◽  
Hubert Gojzewski ◽  
Richard Chartoff ◽  
G. Julius Vancso
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Blocking Agent ◽  
Thermal Polymerization ◽  
Polymer Morphology ◽  
Blocked Isocyanate ◽  
Segmented Polyurethanes ◽  
Isocyanate Prepolymer

To produce segmented polyurethanes that can be processed readily into elastomeric thin films, a thermally labile blocking agent was used to synthesize an isocyanate prepolymer. The final product was formed by bulk thermal polymerization. The resulting polymer morphology imparted enhanced mechanical properties.

In Situ Method for Measuring the Mechanical Properties of Nafion Thin Films during Hydration Cycles

2015 ◽  
Vol 7 (32) ◽  
pp. 17874-17883 ◽  
Author(s):  
Kirt A. Page ◽  
Jae Wook Shin ◽  
Scott A. Eastman ◽  
Brandon W. Rowe ◽  
Sangcheol Kim ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
In Situ Method

scholarly journals Experimental and predicted mechanical properties of Cr1−xAIxN thin films, at high temperatures, incorporating in situ synchrotron radiation X-ray diffraction and computational modelling

RSC Advances ◽  
2017 ◽  
Vol 7 (36) ◽  
pp. 22094-22104 ◽  
Author(s):  
Ehsan Mohammadpour ◽  
Zhong-Tao Jiang ◽  
Mohmmednoor Altarawneh ◽  
Nicholas Mondinos ◽  
M. Mahbubur Rahman ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Synchrotron Radiation ◽  
Computational Modelling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Al Content ◽  
Magnetic Sputtering ◽  
Sputtering System

Cr1−xAlxN coatings, synthesised by an unbalanced magnetic sputtering system, showed improved microstructure and mechanical properties for ∼14–21% Al content.

Integrated Multi-Sensor Tribo-SPM Nano+Micro Tribo-Metrology

2005 ◽  
Author(s):  
Norm Gitis ◽  
Antanas Daugela ◽  
Jun Xiao ◽  
Michael Vinogradov
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Optical Microscope ◽  
In Situ Monitoring ◽  
Nano Indentation ◽  
Solid Thin Films

A novel quantitative nano+micro tribometer with integrated AFM and optical microscope has been utilized to characterize tribological and mechanical properties of liquid and solid thin films and coatings, with in-situ monitoring their changes during micro and nano indentation, scratching, reciprocating, rotating and other tribology tests.

In-Situ Quantitative Integrated Tribo-SPM Nano-Micro-Metrology

2004 ◽  
Author(s):  
Norm Gitis ◽  
Antanas Daugela ◽  
Arun Sikder ◽  
Michael Vinogradov ◽  
Alex Meyman
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Optical Microscope ◽  
In Situ Monitoring ◽  
Materials Properties ◽  
Nano Indentation ◽  
Solid Thin Films ◽  
Microscope Imaging

A novel quantitative nano/micro-tribometer with integrated SPM and optical microscope imaging has been developed to characterize numerous physical and mechanical properties of liquid and solid thin films and coatings, with in-situ monitoring their changes during micro and nano indentation, scratching, reciprocating, rotating and other tribology tests. Both the materials properties and surface topography can be assessed periodically during the tests.

Viscoelastic Behavior of Polymer Thin‐Films Under Thermal Stresses

1996 ◽  
Vol 445 ◽  
Author(s):  
Stephen D. Bluestein ◽  
Dewi P. Y. Bramono ◽  
Ioannis N. Miaoulis ◽  
Peter Y. Wong
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Thermal Loading ◽  
Thermal Stresses ◽  
Viscoelastic Behavior ◽  
Polymer Materials ◽  
Microelectronic Packaging ◽  
Polyimide Films ◽  
Different Temperatures

AbstractStresses and deformation in microelectronic packaging are affected by the viscoelastic behavior of polymer materials during manufacture or operation. Predicting and measuring these thermo‐mechanical effects is important for new devices, components, and materials. The viscoelastic response of Nycoa 851 polyimide thin‐films during thermal loading is investigated. The time‐dependent relaxation of polyimide films was measured in‐situ, focusing on the change in thermo‐mechanical properties based on the thickness of the polyimide layer. The curvature change of the multilayer structure (silver‐polyimide‐quartz heterostructure) was obtained for different temperatures and polymer film thicknesses. The polyimide relaxation time constant and activation energy were determined. Results indicate that the thermo‐mechanical properties of polyimide thin films are dependent on the thickness of the polymer layer.

Effects of Mechanical Properties of Metal Films on The Adhesion Strength of Cr/Polyimide Interfaces

1996 ◽  
Vol 436 ◽  
Author(s):  
Jin Won Choi ◽  
Tae Sung Oh
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Yield Strength ◽  
Peel Strength ◽  
Metal Films ◽  
Rf Plasma ◽  
Lower Yield ◽  
Lower Yield Strength ◽  
Sputter Deposited

AbstractEffects of mechanical properties of Cu/Cr metal films on the peel strength of Cr/PI interfaces have been studied. Cr and Cu thin films were successively sputter-deposited on in-situ RF plasma-treated polyimides, and 20 μm-thick Cu was electroplated. With increasing the yield strength of Cu/Cr films from 156 MPa to 325 MPa, peel strength of Cr/PMDA-ODA and Cr/BPDA-PDA were lowered from 75 g/mam to 57 g/mm and from 69 g/mm to 20 g/mm, respectively. With identical Cu/Cr metal films, lower peel strength was obtained on Cr/BPDA-PDA interfaces, compared to the values of Cr/PMDA-ODA. Peel strength was also decreased more pronouncedly on Cr/BPDA-PDA with increasing the yield strength of Cu/Cr metal films. With T/H (80°C/94% R.H.) exposure, however, peel strength was lowered much more pronouncedly on Cr/PMDA-ODA than on Cr/BPDA-PDA, especially for specimens with Cu/Cr metal films of lower yield strength.

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