scholarly journals Ramesh Shrestha, Sheng Shen and Maarten P. de Boer *

Actuators ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 71 ◽  
Author(s):  
Ramesh Shrestha ◽  
Sheng Shen ◽  
Maarten P. de Boer
Keyword(s):  
Thermal Properties ◽  
Molecular Chain ◽  
Nanometer Scale ◽  
Mechanical And Thermal Properties ◽  
Polymer Nanofibers ◽  
Scale Size ◽  
Scale Test ◽  
High Degree ◽  
Micrometer Scale ◽  
Measurement Artifacts

Because they can achieve a high degree of molecular chain alignment in comparison with their bulk counterparts, the mechanical and thermal properties of polymer nanofibers are of great interest. However, due to their nanometer-scale size, it is difficult to manipulate, grip, and test these fibers. Here, we demonstrate simple repeatable methods to transfer as-drawn fibers to micrometer-scale test platforms where their properties can be directly measured. Issues encountered and methods to minimize measurement artifacts are also discussed.

scholarly journals Application of the correct design of successive self-nucleation and annealing (SSA) to study the stereo-defects and its distribution of homo- and co-polypropylene

RSC Advances ◽  
2017 ◽  
Vol 7 (40) ◽  
pp. 24870-24877 ◽  
Author(s):  
Cong Ding ◽  
Geng Zhang ◽  
Jiangjiang Gu ◽  
Feifei Cao ◽  
Xinsheng Zheng
Keyword(s):  
Thermal Properties ◽  
Molecular Chain ◽  
Mechanical And Thermal Properties ◽  
Preliminary Characterization ◽  
Correct Design

The SSA revealed the differences in molecular chain microstructure of different PP samples when the preliminary characterization found that the homo-polypropylene or co-polypropylene samples had the similar mechanical and thermal properties.

Characterization of Mechanical and Thermal Properties Using Ultrafast Optical Metrology

MRS Bulletin ◽  
2006 ◽  
Vol 31 (8) ◽  
pp. 607-613 ◽  
Author(s):  
G. Andrew Antonelli ◽  
Bernard Perrin ◽  
Brian C. Daly ◽  
David G. Cahill
Keyword(s):  
Thin Films ◽  
Thermal Properties ◽  
Ultrafast Lasers ◽  
Normal Modes ◽  
Picosecond Laser ◽  
Mechanical And Thermal Properties ◽  
Optical Pump ◽  
Ultrafast Optical ◽  
Modes Of Vibration ◽  
Micrometer Scale

AbstractUltrafast lasers have long been used to study the dynamics of fast optical, electronic, and chemical processes in materials. These tools can also be used in a variety of optical pump and probe spectroscopies to generate and detect acoustic signals with frequencies on the order of 100 GHz, and to generate and detect thermal waves with penetration depths on the scale of nanometers. The short wavelengths of these probes make them ideal for the study of the mechanical and thermal properties of thin films, their interfaces, and nanostructures. We describe the picosecond-laser acoustics technique and demonstrate how it can be used to extract the elastic constants and the adhesion of thin films and probe the normal modes of vibration of nanostructures. The thermal properties of thin films are also accessible through time-domain thermoreflectance. Since the mechanical and thermal properties can be obtained quickly on micrometer-scale regions of a sample, spatial mapping of the properties is also possible.

Mechanical and thermal characterization of grafted PP-NCC nanocomposites

2019 ◽  
pp. 089270571987822
Author(s):  
Saud Aldajah ◽  
Mohammad Y Al-Haik ◽  
Waseem Siddique ◽  
Mohammad M Kabir ◽  
Yousef Haik
Keyword(s):  
Thermal Properties ◽  
Interfacial Adhesion ◽  
Thermal Characterization ◽  
Mechanical And Thermal Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Three Point Bending ◽  
Twin Screw ◽  
Thermal Stability Of

This study reveals the enhancement of mechanical and thermal properties of maleic anhydride-grafted polypropylene (PP- g-MA) with the addition of nanocrystalline cellulose (NCC). A nanocomposite was manufactured by blending various percentages of PP, MA, and NCC nanoparticles by means of a twin-screw extruder. The influence of varying the percentages of NCC on the mechanical and thermal behavior of the nanocomposite was studied by performing three-point bending, nanoindentation, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy tests. The novelty of this study stems on the NCC nanoparticles and their ability to enhance the mechanical and thermal properties of PP. Three-point bending and nanoindentation tests revealed improvement in the mechanical properties in terms of strength, modulus, and hardness of the PP- g-MA nanocomposites as the addition of NCC increased. SEM showed homogeneity between the mixtures which proved the presence of interfacial adhesion between the PP- g-MA incorporated with NCC nanoparticles that was confirmed by the FTIR results. DSC and TGA measurements showed that the thermal stability of the nanocomposites was not compromised due to the addition of the coupling agent and reinforced nanoparticles.

Ta addition effects on the structure, mechanical and thermal properties of sputtered Hf-Ta-C film

2019 ◽  
Vol 45 (12) ◽  
pp. 15596-15602 ◽  
Author(s):  
Xinlei Gu ◽  
Lina Yang ◽  
Xiaorong Ma ◽  
Xuan Dai ◽  
Jia Wang ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Mechanical And Thermal Properties
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