Temperature Dependent Viscoelastic Behavior of FRP/ZnO Nano-Rods Hybrid Nanocomposites

2013 ◽  
Author(s):  
Amir Alipour Skandani ◽  
Ayoub Yari Boroujeni ◽  
Marwan Al-Haik
Keyword(s):  
Carbon Fibers ◽  
Elevated Temperatures ◽  
Hybrid Composites ◽  
Superposition Principle ◽  
Viscoelastic Behavior ◽  
Mechanical Analysis ◽  
Hybrid Nanocomposites ◽  
Temperature Dependent ◽  
Reinforced Plastics ◽  
Nano Rods

The inclusion of nanomaterials within fiber reinforced plastics (FRPs) could improve their resistance against time dependent deformation. Conceivable high temperature applications of such hybrid composites make it crucial to investigate their temperature-dependent properties as well as their durability. In this study, zinc oxide (ZnO) nano rods were grown on the surface of carbon fibers and the hybridized reinforcement was formed in a laminate composites. The viscoelastic behavior was probed utilizing dynamic mechanical analysis (DMA). The time/temperature superposition principle (TTSP) was invoked to obtain the viscoelastic properties of FRPs based on fibers with different surface treatments. Results indicated that the presence of ZnO nano rods at the interface between the carbon fibers and the epoxy matrix enhances the composite’s creep resistance at elevated temperatures and prolonged duration.

Viscoelastic behavior of epoxy/carbon fiber/Zno nano-rods hybrid composites

2014 ◽  
Vol 36 (11) ◽  
pp. 1967-1972 ◽  
Author(s):  
Amir Alipour Skandani ◽  
Ayoub Yari Boroujeni ◽  
Roozbeh Kalhor ◽  
Scott W. Case ◽  
Marwan Al-Haik
Keyword(s):  
Carbon Fiber ◽  
Hybrid Composites ◽  
Viscoelastic Behavior ◽  
Nano Rods

scholarly journals Temperature Dependent Mechanical Analysis of Chalcogenide (CdS, ZnS) Coated PET Films

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Sandhya Gupta ◽  
Kananbala Sharma ◽  
N. S. Saxena
Keyword(s):  
Elevated Temperatures ◽  
Mechanical Response ◽  
Fourier Transforms ◽  
Flexible Substrate ◽  
Mechanical Analysis ◽  
Temperature Dependent ◽  
Thermal Evaporation Method ◽  
Structural Characterisation ◽  
Pet Film ◽  
Pet Films

Commercial polyethylene terephthalate (PET) film has been used as flexible substrate, and chalcogenide materials such as CdS, ZnS have been coated separately on PET film using vacuum thermal evaporation method. The structural characterisation of CdS-PET and ZnS-PET films has been performed by X-ray diffraction (XRD) pattern and Fourier transforms infrared (FTIR) spectroscopy. The surface morphology of CdS-PET and ZnS-PET films has also been investigated using scanning electron microscope (SEM). Temperature dependent mechanical study of chalcogenide-PET films has been carried out using Dynamic Mechanical Analyser (DMA). The stress-strain curves of chalcogenide coated PET films at room and elevated temperatures explain the mechanical response of these films under the different temperature.

Dynamic Infrared Linear Dichroism Study of the Temperature-Dependent, Viscoelastic Behavior of a Poly(Ester Urethane)

2005 ◽  
Vol 59 (3) ◽  
pp. 305-315 ◽  
Author(s):  
Yanqia Wang ◽  
Steven R. Aubuchon ◽  
Mark E. Smith ◽  
Jon R. Schoonover ◽  
Richard A. Palmer
Keyword(s):  
Molecular Level ◽  
Viscoelastic Behavior ◽  
Linear Dichroism ◽  
Mechanical Analysis ◽  
Multivariate Curve Resolution ◽  
Temperature Dependent ◽  
Curve Resolution ◽  
Spectral Changes ◽  
Storage And Loss Moduli ◽  
Insight Into

In the study reported here, of the poly(ester urethane), Estane® 5703, simultaneous dynamic mechanical analysis (DMA) and dynamic infrared linear dichroism (DIRLD) measurements have been carried out at continuously variable temperatures from −50 to +30 °C. Multivariate curve resolution–alternating least squares (MCR-ALS) analysis of the spectral data has been correlated with the thermo-mechanical properties. Spectral changes, analyzed as a function of temperature, are compared with the storage and loss moduli to provide insight into viscoelastic behavior at the molecular level. In addition, the data for pure Estane have been compared to those for plasticized Estane samples, which contain 10 and 30% plasticizer by weight. These comparisons show a strong and consistent correlation between the macroscopic rheological properties and the microscopic (molecular, inter-molecular, and sub-molecular) responses of this block co-polymer.

scholarly journals Temperature Effect on Fracture of a Zr-Based Bulk Metallic Glass

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2391
Author(s):  
Na Yang ◽  
Jun Yi ◽  
Yu Hang Yang ◽  
Bo Huang ◽  
Yan Dong Jia ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elevated Temperatures ◽  
Relaxation Spectrum ◽  
Mechanical Analysis ◽  
Relaxation Processes ◽  
Temperature Dependent ◽  
Engineering Structures ◽  
Superior Mechanical Properties

Bulk metallic glass (BMGs) is highly expected for applications in engineering structures due to their superior mechanical properties. The fracture toughness of some BMGs was investigated at cryogenic and at elevated temperatures. However, the mechanism of the temperature-dependence of BMG toughness still remains elusive. Here, we characterized the fracture toughness of Zr61Ti2Cu25Al12 BMG prepared with Zr elemental pieces with low Hf content at temperatures ranging from 134 to 623 K. The relaxation spectrum of the BMG was characterized by a dynamic mechanical analysis using the same temperature range. We found that the BMG is tougher at onset temperatures of the relaxation processes than at peak temperatures. The temperature-dependent fracture toughness of the BMG is strongly dependent on its relaxation spectrum.

Morphology and properties of PA6 hybrid composites filled with short carbon fibers and organoclay

2016 ◽  
Vol 2 (3) ◽  
pp. 47-57 ◽  
Author(s):  
S.S. Pesetskii ◽  
S.P. Bogdanovich ◽  
V.V. Dubrovskii ◽  
T.M. Sodyleva ◽  
V.N. Aderikha ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Hybrid Composites ◽  
Short Carbon

Influence of filler hybridization on thermomechanical properties of hemp/silver epoxy composite

2020 ◽  
pp. 096739112097811
Author(s):  
Munjula Siva Kumar ◽  
Santosh Kumar ◽  
Krushna Gouda ◽  
Sumit Bhowmik
Keyword(s):  
Thermal Conductivity ◽  
Silver Nanoparticles ◽  
Epoxy Polymer ◽  
Hybrid Composites ◽  
Conductive Filler ◽  
Weight Fraction ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Material Behavior ◽  
Good Crystallinity

The polymer composite material’s thermomechanical properties with fiber as reinforcement material have been widely studied in the last few decades. However, these fiber-based polymer composites exhibit problems such as fiber orientation, delamination, fiber defect along the length and bonding are the matter of serious concern in order to improve the thermomechanical properties and obtain isotropic material behavior. In the present investigation filler-based composite material is developed using natural hemp and high thermal conductive silver nanoparticles (SNP) and combination of dual fillers in neat epoxy polymer to investigate the synergetic influence. Among various organic natural fillers hemp filler depicts good crystallinity characteristics, so selected as a biocompatible filler along with SNP conductive filler. For enhancing their thermal conductivity and mechanical properties, hybridization of hemp filler along with silver nanoparticles are conducted. The composites samples are prepared with three different combinations such as sole SNP, sole hemp and hybrid (SNP and hemp) are prepared to understand their solo and hybrid combination. From results it is examined that, chemical treated hemp filler has to maximized its relative properties and showed, 40% weight % of silver nanoparticles composites have highest thermal conductivity 1.00 W/mK followed with hemp filler 0.55 W/mK and hybrid 0.76 W/mK composites at 7.5% of weight fraction and 47.5% of weight fraction respectively. The highest tensile strength is obtained for SNP composite 32.03 MPa and highest young’s modulus is obtained for hybrid composites. Dynamic mechanical analysis is conducted to find their respective storage modulus and glass transition temperature and that, the recorded maximum for SNP composites with 3.23 GPa and 90°C respectively. Scanning electron microscopy examinations clearly illustrated that formation of thermal conductivity chain is significant with nano and micro fillers incorporation.

scholarly journals Physical networks from entropy-driven non-covalent interactions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Anthony C. Yu ◽  
Huada Lian ◽  
Xian Kong ◽  
Hector Lopez Hernandez ◽  
Jian Qin ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Dissociation Rate ◽  
Mathematical Framework ◽  
Temperature Dependent ◽  
Nanoparticle Interactions ◽  
Temperature Superposition ◽  
Non Covalent Interactions ◽  
Time Temperature Superposition ◽  
Covalent Interactions ◽  
Physical Crosslinking

AbstractPhysical networks typically employ enthalpy-dominated crosslinking interactions that become more dynamic at elevated temperatures, leading to network softening. Moreover, standard mathematical frameworks such as time-temperature superposition assume network softening and faster dynamics at elevated temperatures. Yet, deriving a mathematical framework connecting the crosslinking thermodynamics to the temperature-dependent viscoelasticity of physical networks suggests the possibility for entropy-driven crosslinking interactions to provide alternative temperature dependencies. This framework illustrates that temperature negligibly affects crosslink density in reported systems, but drastically influences crosslink dynamics. While the dissociation rate of enthalpy-driven crosslinks is accelerated at elevated temperatures, the dissociation rate of entropy-driven crosslinks is negligibly affected or even slowed under these conditions. Here we report an entropy-driven physical network based on polymer-nanoparticle interactions that exhibits mechanical properties that are invariant with temperature. These studies provide a foundation for designing and characterizing entropy-driven physical crosslinking motifs and demonstrate how these physical networks access thermal properties that are not observed in current physical networks.

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