Preparation and characterization of polyurethane damping materials derived from mixed-base prepolymers containing numerous side methyls

e-Polymers ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 323-327 ◽  
Author(s):  
Yang Feng ◽  
Haijun Zhou ◽  
Xiaolei Zhang ◽  
Yongzhen Li ◽  
Yantao Li
Keyword(s):  
Mechanical Properties ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Toluene Diisocyanate ◽  
Scanning Tunneling ◽  
Polypropylene Glycol ◽  
Tunneling Microscopy ◽  
Tensile Testing Machine ◽  
Dynamic Mechanical ◽  
Damping Materials

AbstractPolyurethane (PU) damping materials were prepared by mixed-base PU prepolymers and 4,4′-methylene- bis-(2-chloroaniline) (MOCA) as chain extender. The prepolymer was synthesized from poly(hydroxypivalyl hydroxypivalate succinate) (PHPS) or polypropylene glycol 2000 (PPG-2000) with 2,4-toluene diisocyanate (TDI-100), respectively. The structure, morphology, and dynamic and static mechanical properties were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning tunneling microscopy (STM), dynamic mechanical thermal analysis (DMA), and tensile testing machine, respectively. The results indicated that the mass ratios of polyester prepolymer (PESP) and polyether prepolymer (PETP) (mPESP/mPETP ratio) had significantly affected the dynamic mechanical properties of the PUs. When the mPESP/mPETP ratio was 40/60 and 45/55, and PUs had the temperature range (ΔT) higher than 60°C for efficient loss factor (tanδ>0.4) in the DMA curve with bimodal. The phase diagrams of STM indicated that more complex combination of hard and soft segments existed in the PUs, and the segments of PESP and PETP formed irregular block structures. Furthermore, the mechanical properties of PUs were of higher value. It is believed that PUs may be used as potential damping materials.

scholarly journals Styrene–Acrylic Emulsion with “Transition Layer” for Damping Coating: Synthesis and Characterization

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1406
Author(s):  
Daoyuan Chen ◽  
Mingjin Ding ◽  
Zhixiong Huang ◽  
Yanbing Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Transition Layer ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Latex Film ◽  
Seeded Emulsion Polymerization ◽  
Acrylic Emulsion ◽  
Dynamic Mechanical

In order to study the dynamic mechanical properties of styrene–acrylic latex with a core/shell structure, a variety of latexes were synthesized by semi-continuous seeded emulsion polymerization based on “particle design” with the same material. The latexes were characterized by rotary viscosimeter, dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), dynamic mechanical analysis (DMA), and universal testing machine. The effects of difference at the glass transition temperature (Tg) of core and shell and the introduction of the “transition layer” on the damping and mechanical properties of latex film were studied. The results indicate that as the Tg of core and shell gets closer, the better the compatibility of core and shell, from phase separation to phase continuity. Furthermore, the introduction of the “transition layer” can effectively improve the tensile strength and tan δ (max) of the latex film. The tensile strength and maximum loss factor (f = 1 Hz) of latex with the “transition layer” increased by 36.73% and 29.11% respectively compared with the latex without the “transition layer”. This work provides a reference for the design of emulsion for damping coating.

scholarly journals Study on Dynamic Mechanical Properties and Constitutive Model Construction of TC18 Titanium Alloy

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 44 ◽  
Author(s):  
Changming Zhang ◽  
Anle Mu ◽  
Yun Wang ◽  
Hui Zhang
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Flow Stress ◽  
Yield Strength ◽  
Constitutive Model ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Stress Strain ◽  
Dynamic Mechanical ◽  
Different Temperatures

In order to investigate the static and dynamic mechanical properties of TC18 titanium alloy, the quasi-static stress–strain curve of TC18 titanium alloy under room temperature was obtained by DNS 100 electronic universal testing machine (Changchun Institute of Mechanical Science Co., Ltd., Changchun, China). Meanwhile, the flow stress–strain curves under different temperatures and strain rates are analyzed by split Hopkinson pressure bar (SHPB) device with synchronous assembly system. On the basis of the two experimental data, the JC constitutive model under the combined action of high temperature and impact load is established using the linear least squares method. The results show the following: the yield strength and flow stress of TC18 titanium alloy increase slowly with the increase of the strain rate, and the strain value corresponding to the yield strength is reduced. With the increase of strain, the flow stress increases at first and then decreases at different temperatures. The strain value corresponding to the transition point rises with the temperature increase, and the corresponding stress value remains basically unchanged. With the increase of experimental temperature, the flow stress shows a downward trend, and the JC constitutive model can predict the plastic flow stress well.

Influence of Diisocyanates on Dynamic Mechanical Properties of Castable Polyurethane Elastomers

2012 ◽  
Vol 217-219 ◽  
pp. 563-566
Author(s):  
Xiao Dong Chen ◽  
Yu Hua Yi
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Analysis ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Toluene Diisocyanate ◽  
Diphenylmethane Diisocyanate ◽  
Analysis Method ◽  
Polyurethane Elastomers ◽  
Dynamic Mechanical ◽  
Soft Segments

A series of castable polyurethane elastomers, based on polytetramethylene glycol as soft segments and toluene diisocyanate, 4, 4’-diphenylmethane diisocyanate, P-phenylene diisocyanate as diisocyanates respectively, were synthesized. The dynamic mechanical analysis method was utilized to determine tan delta property (tanδ). Also the influence of diisocyanates on the dynamic mechanical properties of castable polyurethane elastomers was analyzed. It can be concluded that the P-phenylene diisocyanate system elastomers have the most excellent dynamic mechanical properties.

Effect of Particle Sizes on Rate Sensitivity and Dynamic Mechanical Properties of Polypropylene/Silica (PP/Sio2) Nanocomposites

2011 ◽  
Vol 364 ◽  
pp. 181-185 ◽  
Author(s):  
Firdaus Omar Mohd ◽  
Md Akil Hazizan ◽  
Zainal Arifin Ahmad
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Strain Rate ◽  
Testing Machine ◽  
Rate Sensitivity ◽  
Dynamic Mechanical Properties ◽  
Particle Sizes ◽  
Rate Condition ◽  
Dynamic Mechanical ◽  
Silica Nanocomposites

Filler-related characteristic such as particle size, shape and geometry are essential factors that need to be considered during the evaluation of the material’s performance especially in the area of particle filled composites. However, there is limited number of works are reported on this particular issue under high strain rate condition. Based on this concern, the paper presents an experimental results on the effect of particle sizes towards rate sensitivity and dynamic compressive properties of polypropylene/silica nanocomposites across strain rate from 10-2to 10-3s-1. The composite specimens were tested using universal testing machine for static loading and a compression split Hopkinson pressure bar apparatus for dynamic loading. Results show that, the stiffness and strength properties of polypropylene/silica nanocomposites were affected by the size of silica particles. However, the magnitudes of changed are somehow different between micro and nanosizes. On the other hand, particle size also plays a major contribution towards sensitivity of the polypropylene/silica nanocomposites where the smaller the reinforcement sizes, the less sensitive would be the composites. Overall, it is convenience to say that the particle size gives significant contribution towards rate sensitivity and dynamic mechanical properties of polypropylene/silica nanocomposites.

scholarly journals Damping properties of para-phenylene terephthalamide pulps modified damping materials

2016 ◽  
Vol 36 (2) ◽  
pp. 137-148 ◽  
Author(s):  
Baihua Yuan ◽  
Meng Chen ◽  
Yu Liu ◽  
Shexu Zhao ◽  
Heng Jiang
Keyword(s):  
Mechanical Properties ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
Vibration Damping ◽  
Damping Properties ◽  
Machine Direction ◽  
Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Damping Property ◽  
Damping Materials

A series of para-phenylene terephthalamide pulp modified damping materials were prepared. The dynamic mechanical properties, differential scanning calorimetry, vibration damping properties, vulcanization property, tensile strengths as well as scanning electron microscopy micrographs of the damping materials were studied theoretically and experimentally. The dynamic mechanical properties of para-phenylene terephthalamide pulp modified damping materials were also compared with aramid short-cut fiber, E-glass staple fiber and carbon fiber powder modified damping materials. The results showed that para-phenylene terephthalamide pulp modified damping materials exhibited the best damping property and highest modulus in comparison with the other types of fibers. The storage modulus ( E′), loss modulus ( E″) and tensile strength of the materials were all increased significantly with increasing pulp content, and this trend was significantly greater in machine direction rather than in cross-machine direction. The second, third and fourth modes modal loss factors (η) of the steel beams coated with para-phenylene terephthalamide pulp modified damping materials increased substantially up to a maximum, and then became stable with increasing pulp amount. The optimal η in machine direction was achieved as the mass ratio of butadiene-acrylonitrile rubber to para-phenylene terephthalamide pulp was 100:30. Excellent damping property was mainly attributed to the extremely high interfacial contact area which significantly improved the efficiency of energy dissipation of internal friction, interfacial sliding and dislocation motion between para-phenylene terephthalamide pulps and butadiene-acrylonitrile rubber chains. Since para-phenylene terephthalamide pulp modified damping materials offer a high E′, excellent vibration damping properties, broad damping temperature and frequency ranges, it is ideal for free-damping structures which are widely utilized in industrial vibration and noise control applications.

Dynamic Mechanical Properties of CNTs/MoSi2 Composite Material

2010 ◽  
Vol 105-106 ◽  
pp. 75-78
Author(s):  
Guang Ping Zou ◽  
Zhong Liang Chang ◽  
Ying Jie Qiao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Composite Material ◽  
Dynamic Performance ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Static Compression ◽  
Dynamic Mechanical ◽  
Waveform Shaping ◽  
Mosi2 Composite

Carbon nanotubes (CNTs) are good reinforcement of composite materials, through add appropriate amount of carbon nanotubes to MoSi2 can be improve the strength and toughness of MoSi2. In this paper, the material of CNTs/MoSi2 was made through vacuum hot pressing technology. And the split hopkison press bar (SHPB) technology was used for testing the dynamic mechanical properties of CNTs/MoSi2 composite material which has different proportion of CNTs. In the SHPB experiment, in order to get better waveforms, the waveform shaping technology was used for improving the waveform quality, and also the strain gauge technology was used for testing the real strain of the specimen in the dynamic loading process. Through calculating, the dynamic stress-strain curves which under different high strain rate are given. At the same time, the strength, deformation and other test results are analyzed, and also compared them with the static compression experiment results of the CNTs/MoSi2 specimen which is tested by the electronic universal testing machine, and then obtained the dynamic performance of CNTs/MoSi2 composite material.

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.

Fabrication of Rice Husk Ash/Natural Rubber Composite

2011 ◽  
Vol 393-395 ◽  
pp. 92-96 ◽  
Author(s):  
Zong Qiang Zeng ◽  
He Ping Yu ◽  
Hong Chao Liu ◽  
Shuang Quan Liao ◽  
Zheng Peng
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Natural Rubber ◽  
Rice Husk ◽  
Coupling Agent ◽  
Rice Husk Ash ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Main Trend ◽  
Dynamic Mechanical

The preparation of rubber-based composite from agricultural by-product is the main trend to upgrade the performance of rubber and reduce the cost. In this work, the rice husk ash/natural rubber (RHA/NR) composites were prepared by latex mixing process using the RHA modified with rare earth coupling agent. The mechanical properties, dynamic mechanical properties, thermal stability and morphology of RHA/NR composites were analyzed by universal testing machine, dynamic mechanical analyzer, thermo gravimetric analyzer and scanning electron microscope. The results indicate that previous modification of RHA with rare earth coupling agent can improve the dispersion of RHA in NR matrix significantly and increase the interaction between RHA particles and NR matrix and thus upgrade the mechanical properties and anti-oxidative behaviors of RHA/NR composite. The RHA/NR composite of highest mechanical properties and anti-oxidative behaviors can be obtained with a RHA loading of 4 per hundred rubber.

Effects of poly(styrene-co-maleic anhydride) on the performance of LGF/TPU/ABS composites

2016 ◽  
Vol 23 (5) ◽  
pp. 475-480 ◽  
Author(s):  
Wulei Zhou ◽  
Jian Xiao ◽  
Fang Liu ◽  
Shuhao Qin
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Glass Fiber ◽  
Thermoplastic Polyurethane ◽  
Testing Machine ◽  
Acrylonitrile Butadiene Styrene ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber

AbstractA series of long glass fiber-reinforced thermoplastic polyurethane (TPU) elastomers and acrylonitrile-butadiene-styrene (ABS) copolymer (LGF/TPU/ABS) composites were prepared using self-designed impregnation device. Poly(styrene-co-maleic anhydride) was employed to increase the compatibility between glass fiber and matrix resin and thus obtain the excellent properties of composites. The dynamic mechanical properties of the composites have been investigated using dynamic mechanical thermal analysis. The results indicated that the storage modulus of the composites gradually increases and then decreases with increasing compatibilizer content. In addition, the low temperature peak of the composites shifts to higher temperature with increasing compatibilizer content. The thermal properties of the composites were studied by thermogravimetric analyzer. In addition, the morphology and mechanical properties of the composites are investigated by scanning electron microscopy, a universal testing machine, and a ZBC-4 Impact Pendulum.

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