Improving Study on Wear Resistance and Mechanical Properties of Graphene / Polyurethane Microfoam Composites

2021 ◽  
Vol 904 ◽  
pp. 226-231
Author(s):  
Guang Lei Lv ◽  
Xin Mei Liu ◽  
Ming Zhao ◽  
Yuan Yuan Li
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
In Situ Polymerization ◽  
Testing Machine ◽  
Universal Testing ◽  
Reduced Graphene ◽  
Polyurethane Composites ◽  
Polyurethane Nanocomposites ◽  
Scanning Electron

Modified reduced graphene oxide (rtgo) was prepared by using γ - isocyanate propyl triethoxysilane (IPTS) as modifier. Graphene / polyurethane nanocomposites were prepared by in-situ polymerization. Graphene / polyurethane composites were characterized by scanning electron microscopy, TGA, DIN abrasion and electronic universal testing machine. The effects of different reaction formulations and graphene addition on the wear resistance and mechanical properties of the composites were studied. The results show that the wear resistance and tear resistance of the composite can be greatly improved after the functional graphene is compounded with polyurethane.

Studies on Friction and Mechanical Properties of High Density Polypropylene (HDPP) Filled with Modified Talc

2012 ◽  
Vol 624 ◽  
pp. 279-282
Author(s):  
Feng Zhan ◽  
Nan Chun Chen
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Lamellar Structure ◽  
Testing Machine ◽  
High Density ◽  
Impact Testing ◽  
Wear Testing ◽  
Frictional Surface ◽  
Universal Testing ◽  
Scanning Electron

Talc was modified by aluminate coupling agent (ACA) before filling it into high density polypropylene (HDPP) to prepare talc/HDPP composites. Scanning electron microscopy (SEM), wear testing machine, electronic universal testing machine, and impact testing machine were used to analyze the surface modification and the effects of modified talc on friction and mechanical properties of modified talc/HDPP composites. The results indicate that after modified the lamellar structure of talc particles are open and the dispersion of particles are improved, and the edges and corners of surface become softer. Friction properties indicate that when the talc content is 8 wt%, both µ and K are at a lower value, which show that have better wear resistance. The frictional surface is relatively smooth and no furrow trace has found. Mechanical properties show that with talc content increasing, tensile strength and flexural strength of composites increase.

The Influence of ZrO2 Containing 10% Eu 3+ on the Polyurethane Hard Domain Structure in Nanocomposites with Luminescence Properties

2007 ◽  
Vol 128 ◽  
pp. 151-156 ◽  
Author(s):  
Joanna Ryszkowska ◽  
Ewelina Zawadzak ◽  
Piotr Zapart ◽  
Witold Łojkowski ◽  
A. Opalińska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Domain Structure ◽  
In Situ Polymerization ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Luminescence Properties ◽  
Hard Domain ◽  
Polyurethane Nanocomposites

This paper presents the results of studies on ZrO2 containing 10% Eu3+ as a nanofiller in polyurethane nanocomposites with luminescent properties. The nanocomposites, which are potential materials for electro-optical-electronic applications, were prepared by in-situ polymerization. Emission spectra, thermodegradation, thermal analysis and mechanical properties of polyurethane ZrO2/10% Eu3+ were investigated and the structure examined using HRSEM. The aim was to investigate the influence of the distribution of nanofillers in the composite and the structure of hard domains of polyurethanes on the relevant properties for opto-electronic applications.

Preparation and properties of LGF/ER/TPU/PMMA composites

2015 ◽  
Vol 22 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Jianbing Guo ◽  
Daohai Zhang ◽  
Huiju Shao ◽  
Kaizhou Zhang ◽  
Bin Wu
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Polyurethane ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Universal Testing ◽  
Long Glass Fiber ◽  
Scanning Frequency ◽  
Morphology And Mechanical Properties ◽  
Scanning Electron

AbstractA series of long glass fiber (LGF)-reinforced epoxy resin (ER), thermoplastic polyurethane (TPU) elastomers, and poly(methyl methacrylate) (PMMA) composites were prepared by using self-designed impregnation device. Dynamic mechanical properties of the LGF/ER/TPU/PMMA composites have been investigated by using dynamic mechanical thermal analysis (DMA). The results indicated that the content of PMMA and TPU and scanning frequency had important influence on dynamic mechanical properties and glass transition of the LGF/ER/TPU/PMMA composites. In addition, the Arrhenius relationship has been used to calculate the activation energy of α-transition of the LGF/ER/TPU/PMMA composites. The thermal properties of the LGF/ER/TPU/PMMA composites were studied by thermogravimetric analysis (TGA). Morphology and mechanical properties of the composites are investigated by scanning electron microscopy (SEM), a universal testing machine, and a ZBC-4 Impact Pendulum.

Preparation PET Hybrided Materials by In Situ Polymerization for Delustered Fibers

2017 ◽  
Vol 898 ◽  
pp. 2166-2173
Author(s):  
Mahgoub Osman Montaser ◽  
Jia Liang Zhou ◽  
Mohamed Nourrein ◽  
Chong Li ◽  
Heng Xue Xiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Hybrid Materials ◽  
In Situ Polymerization ◽  
High Load ◽  
Scanning Calorimetry ◽  
Chemical Structures ◽  
Master Batch ◽  
Scanning Electron

A series of polyethylene terephthalate (PET) hybrid materials with high-load TiO2 content were prepared via in situ polymerization by dispersing unmodified titanium dioxide (TiO2) in Ethylene Glycol (EG), and the influence of load TiO2 nanofillers on the physical properties of PET masterbatch was investigated. The intrinsic viscosities of the prepared PET hybrid materials were affected by the addition of the nanoparticles and in both cases a slight decrease was observed. In addition, the thermal behavior of these PET hybrid materials and neat PET was investigated using Differential Scanning Calorimetry (DSC). The chemical structures of PET hybrid materials were characterized by Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). The TiO2 nanoparticles show well dispersibility in PET matrix. The PET hybrid material with 40wt.% TiO2 content was used as master batch to prepare full dull PET fiber with 2.5 wt.% TiO2. The melt flow ability of PET hybrid materials shows good winding and drawing performance, and also the resulted fiber has better mechanical properties than neat PET fiber. It suggests that this PET/TiO2 masterbatch by in situ polymerization may find good application for delustered fiber preparation.

scholarly journals Polydopamine-Modified Al2O3/Polyurethane Composites with Largely Improved Thermal and Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1772 ◽  
Author(s):  
Ruikui Du ◽  
Li He ◽  
Peng Li ◽  
Guizhe Zhao
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
In Situ Polymerization ◽  
Mechanical Analysis ◽  
Thermal Interface Materials ◽  
Sem Images ◽  
Elongation At Break ◽  
Polyurethane Composites ◽  
Interface Materials

Alumina/polyurethane composites were prepared via in situ polymerization and used as thermal interface materials (TIMs). The surface of alumina particles was modified using polydopamine (PDA) and then evaluated via Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and Raman spectroscopy (Raman). Scanning electron microscope (SEM) images showed that PDA-Al2O3 has better dispersion in a polyurethane (PU) matrix than Al2O3. Compared with pure PU, the 30 wt% PDA-Al2O3/PU had 95% more Young’s modulus, 128% more tensile strength, and 76% more elongation at break than the pure PU. Dynamic mechanical analysis (DMA) results showed that the storage modulus of the 30 wt% PDA-Al2O3/PU composite improved, and the glass transition temperature (Tg) shifted to higher temperatures. The thermal conductivity of the 30 wt% PDA-Al2O3/PU composite increased by 138%. Therefore, the results showed that the prepared PDA-coated alumina can simultaneously improve both the mechanical properties and thermal conductivity of PU.

Effect of Porosity and Pore Size on Microstructures and Mechanical Properties of Metakaolin Blended with Ca(OH)2 and PLA as Porous Geopolymers

2016 ◽  
Vol 690 ◽  
pp. 276-281 ◽  
Author(s):  
Chayanee Tippayasam ◽  
Phachongkit Boonanunwong ◽  
Jocelyn Calvez ◽  
Parjaree Thavorniti ◽  
Prinya Chindaprasirt ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Pore Size ◽  
Potassium Hydroxide ◽  
Thermal Conductivity Coefficient ◽  
Testing Machine ◽  
Construction Materials ◽  
Chemical Compositions ◽  
Universal Testing ◽  
Pozzolanic Materials ◽  
Scanning Electron

Geopolymer is generally made of pozzolanic materials and alkali activators such as sodium alkali or potassium alkali. It can be solidified at ambient temperature to be developed as construction materials. Polylactic acid (PLA) was chosen to create pores in order for porous geopolymers. In this research, the porous geopolymer was developed either to reduce the weight of materials or to be utilized as thermal insulation materials. It was performed by metakaolin (MK), calcium hydroxide (Ca(OH)2), 10 molar potassium hydroxide (10M KOH) and potassium silicate (K2SiO3) for geopolymer pastes. These geopolymer pastes were mixed with 40 wt%, 50 wt% and 60 wt% of PLA and fired at 550°C for 6 h., therefore, pores inside geopolymer structure were found. Consequently, those geopolymers were characterized the mechanical properties e.g. compressive and flexural strength by Universal Testing Machine (UTM), microstructures by Scanning Electron Microscope (SEM), chemical compositions as functional groups by Fourier Infrared Spectroscope (FTIR). Furthermore, the pore size, bulk density, apparent porosity and thermal conductivity coefficient of geopolymers were analyzed. The results presented that the quantity of PLA affected the compressive strength and porosity of geopolymers. In conclusion, our porous geopolymer with 40 wt% PLA gave the highest strength.

scholarly journals Enhancement of physical, chemical, and mechanical properties of biocomposite for the fire resistant material application

2020 ◽  
Vol 10 (3) ◽  
pp. 5423-5428
Keyword(s):  
Mechanical Properties ◽  
Flame Retardants ◽  
Testing Machine ◽  
Physical And Mechanical Properties ◽  
Resistant Material ◽  
Scanning Calorimetry ◽  
Universal Testing ◽  
Physical Chemical ◽  
Fire Resistant Material ◽  
Scanning Electron

This study deals with the enhancement of physical and mechanical properties of oil palm empty fruit bunch fibers (OPEFB) for new fire resistant material application. Two flame retardants (organic and inorganic) were applied to improve the fire resistant capability of the produced fibers. The fire resistant capability was tested according to the ASTM D6413-99 method. Mechanical properties were characterized using a universal testing machine and the differential scanning calorimetry (DSC) was performed to investigate their thermal behaviors. The surface morphology of the produced fibers was observed using scanning electron microscopy (SEM). This study found that the fire resistant capability of the fibers can be improved by the addition of flame retardants. Thermal properties of the treated fibers can be enhanced compared to the untreated fibers. Mechanical properties inspection revealed that increasing the flame retardant concentration (0.5 to 1 M) can improve their tensile strength but started to decrease at a higher concentration (3 M). In general, the present work successfully performed the enhancement of non-woven OPEFB properties for foreseeable fire resistant material applications.

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