scholarly journals Mechanical Properties, Thermal Stability, and Glass Transition Behaviors of a Waterborne Polyurethane/Graphene Oxide Nanocomposite

2017 ◽  
Vol 58 (6) ◽  
pp. 892-897 ◽  
Author(s):  
Hyung Joong Kim ◽  
Jihye Han ◽  
Younggon Son
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Graphene Oxide ◽  
Glass Transition ◽  
Waterborne Polyurethane

scholarly journals Effect of a Monomer Composition on the Mechanical Properties and Glass Transition Temperature of a Waterborne Polyurethane/Graphene Oxide and Waterborne Polyurethane/MWCNT Nanocomposite

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2013
Author(s):  
Hyung Joong Kim ◽  
Jihye Han ◽  
Younggon Son
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Cationic Surfactant ◽  
Waterborne Polyurethane ◽  
Monomer Composition ◽  
Ionic Monomer ◽  
Treated Carbon

Anionic waterborne polyurethane (aWPU) is not compatible with graphene oxide (GO) due to the repulsive force acting on identical ionic charges. In this study, we fabricated cationic surfactant treated GO and cationic surfactant treated carbon nanotube (CNT) to increase the compatibility with aWPU. Cationic waterborne polyurethane (WPU) and nanocomposites thereof were also prepared. On the basis of the mechanical properties of the nanocomposites, glass transition temperature (Tg), and a stability test, it was found that the compatibility between WPU and a nanofiller (NF) was enhanced to a great extent when WPU and NF had opposite ionicity. The Tg and mechanical properties of WPU increased with the addition of NF, showed the maximum value and thereafter decreased with further addition. The effect of composition of ionic monomer in WPU was also investigated. As the composition of the ionic monomer increases, the concentration of NF for the maximum Tg and mechanical properties increases. This was attributed to the ionic association between the NF and WPU.

Thermal Stability of Bulk Metallic Glasses. Influence on Mechanical Properties

1998 ◽  
Vol 554 ◽  
Author(s):  
J. M. Pelletier ◽  
Y. Jacquemard ◽  
J. Perez ◽  
R. Perrier de la Bathie
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Glass Transition ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Atomic Mobility ◽  
Heating Rates ◽  
Characteristic Temperatures ◽  
Shear Elastic Modulus ◽  
Thermal Stability Of

AbstractTwo Zr-base bulk metallic glasses were investigated in the present work. DSC experiments were performed at different heating rates (dT/dt). Evolution of the characteristic temperatures, glass transition and onset of crystallisation, were determined as a function of dT/dt. Evolution of shear elastic modulus and internal friction are measured as a function of temperature and resulting microstructural evolution; these evolutions are related to variation of the atomic mobility.

Functionalized reduced graphene oxide/epoxy composites with enhanced mechanical properties and thermal stability

2017 ◽  
Vol 63 ◽  
pp. 1-11 ◽  
Author(s):  
Suman Chhetri ◽  
Nitai Chandra Adak ◽  
Pranab Samanta ◽  
Naresh Chandra Murmu ◽  
Tapas Kuila
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Epoxy Composites ◽  
Reduced Graphene

Synthesis and properties of polyimides derived from bis(4-aminophenyl)isohexides

2016 ◽  
Vol 29 (2) ◽  
pp. 197-204 ◽  
Author(s):  
Xiaodong Ji ◽  
Jingling Yan ◽  
Xiuju Liu ◽  
Zikun Wang ◽  
Zhen Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Glass Transition ◽  
Physical And Mechanical Properties ◽  
Amic Acid ◽  
Systematic Investigation ◽  
Structure Property ◽  
Free Standing ◽  
Structure Property Relationship ◽  
Relationship Of

Several partially bio-based polyimides have been successfully synthesized by polycondensation between bis(4-aminophenyl)isohexides with various commercial dianhydrides. Flexible and free-standing films were readily obtained from their poly(amic acid) or polyimide solutions. A systematic investigation of the structure–property relationship of polyimides highlights the significant impact of the isohexides moieties on their physical and mechanical properties (glass transition temperature, inherent viscosity, thermal stability, solubility, and mechanical properties). The results revealed that these polyimides exhibited comparable thermal stability and mechanical properties to those of petrochemical-based ones.

Preparation and Properties of Graphene Oxide-Modified Anti-UV Waterborne Polyurethane Nanocomposites

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050005
Author(s):  
Xingyuan Ma ◽  
Mingrui Zhang
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Absorption Rate ◽  
Three Dimensional ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Functional Coating ◽  
Coating Materials ◽  
Polyurethane Nanocomposites

In this present study, graphene oxide (GO) was used as a secondary chain extender and a functional modification assistant to fabricate a three-dimensional nanocomposite (GO-WPU) with waterborne polyurethane (WPU) through the prepolymer dispersion. The tensile strength and elastic modulus of GO-WPU with 0.2[Formula: see text]wt.% GO content, compared with those of pure WPU, increase by 170.38% and 50.9%, respectively. Even with a small amount of GO content added, the ultraviolet absorption rate significantly increased, whereas the ultraviolet transmittance decreased significantly. Other properties such as thermal stability and so on were also much enhanced. These results suggested that the functional nanocomposite GO-WPU prepared through the prepolymer dispersion will be an effective fabrication approach and have a wider scope of applications in functional coating materials and film materials.

Polyimide foams with outstanding flame resistance and mechanical properties by the incorporation of noncovalent bond modified graphene oxide

2020 ◽  
Vol 44 (28) ◽  
pp. 12068-12078 ◽  
Author(s):  
Hongtao Liu ◽  
Huafeng Tian ◽  
Yuanyuan Yao ◽  
Aiming Xiang ◽  
Haisong Qi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Graphene Oxide ◽  
Flame Resistance ◽  
Noncovalent Bond ◽  
Composite Foams ◽  
Modified Graphene Oxide ◽  
Modified Graphene

PI composite foams were in situ generated by incorporating modified GO to further improve flame resistance, thermal stability and mechanical properties.

Physical and Mechanical Properties of Epoxy-Nanoparticulate Composite Adhesive

2012 ◽  
Vol 585 ◽  
pp. 297-300 ◽  
Author(s):  
Prakriti Kumar Ghosh ◽  
Manjeet Singh Goyat ◽  
Deepak Mishra ◽  
Rishabh Nagori
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Glass Transition ◽  
Tensile Properties ◽  
Physical And Mechanical Properties ◽  
Epoxy Adhesive ◽  
Al2o3 Nanoparticles ◽  
Thermal And Mechanical Properties ◽  
Vibration Process ◽  
Dispersion Of Nanoparticles

The effect of type of nanoparticles on morphology, thermal and mechanical properties of epoxy-nanoparticulate composite adhesive produced via ultrasonic vibration process has been investigated. The morphology, thermal and mechanical properties of epoxy-nanoparticulate composite adhesive was measured with FESEM/AFM, DTA/TGA, and Hounsfield respectively. The FESEM/AFM images of the epoxy-nanoparticulate composite adhesive reveals significantly fine dispersion of nanoparticles. The incorporation TiO2 nanoparticles in epoxy adhesive results in improved glass transition temperature (Tg), thermal stability and tensile properties of the nanocomposite. But, the incorporation of comparatively finer size Al2O3 nanoparticles leads to decrease in the Tg, thermal stability and tensile properties of the nanocomposite.

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