Chain Structure and Dynamic Mechanical Property of the Vinylidenefluoride and Chlorotrifluoroethylene Copolymers

2014 ◽  
Vol 1049-1050 ◽  
pp. 123-128
Author(s):  
Guo Ping Zeng ◽  
Chun Bo Yue ◽  
Ya Qing Weng ◽  
Ming Yu Wang ◽  
Heng Feng Li
Keyword(s):  
Mechanical Properties ◽  
Random Distribution ◽  
Dynamic Mechanical Properties ◽  
Chain Structure ◽  
Radical Copolymerization ◽  
Dynamic Mechanical Property ◽  
Diffraction Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dynamic Mechanical

A series of vinylidenefluoride (VDF) and chlorotrifluoroethylene (CTFE) copolymers were prepared by radical copolymerization, the chain elements structures of the copolymers were gain with the elemental analysis, and the crystal regions with X-ray diffraction spectrum. The effect of chain elements structure on the crystallinity and dynamic mechanical properties was discussed with the DMA analysis. The result shows: the increasing of the CTFE content decreases the chain elements structure of VDF-VDF, the random distribution of VDF-CTFE structure has a great effect on the crystallization properties and the dynamic mechanical properties. The increasing of CTFE content improves the storage modulus and the damping of copolymers in the amorphous copolymers, while the distribution of chain segments’ length gets narrower.

scholarly journals X-ray Photoelectron Spectroscopic Analysis of Modified MWCNT and Dynamic Mechanical Properties of E-beam Cured Epoxy Resins with the MWCNT

2009 ◽  
Vol 10 (4) ◽  
pp. 314-319 ◽  
Author(s):  
Young-Seak Lee ◽  
Ji-Sun Im ◽  
Seok-Min Yun ◽  
Young-Chang Nho ◽  
Phil-Hyun Kang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
Spectroscopic Analysis ◽  
Dynamic Mechanical Properties ◽  
X Ray ◽  
Dynamic Mechanical

scholarly journals Effect of Short Fiber Reinforcement on Mechanical Properties of Hybrid Phenolic Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Sembian Manoharan ◽  
Bhimappa Suresha ◽  
Govindarajulu Ramadoss ◽  
Basavaraj Bharath
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Loss Modulus ◽  
Basalt Fiber ◽  
Barium Sulphate ◽  
Dynamic Mechanical Properties ◽  
Damping Factor ◽  
X Ray ◽  
Weight Percentage ◽  
Dynamic Mechanical

Fiber plays an important role in determining the hardness, strength, and dynamic mechanical properties of composite material. In the present work, enhancement of viscoelastic behaviour of hybrid phenolic composites has been synergistically investigated. Five different phenolic composites, namely, C1, C2, C3, C4, and C5, were fabricated by varying the weight percentage of basalt and aramid fiber, namely, 25, 20, 15, 10, and 5% by compensating with barium sulphate (BaSO4) to keep the combined reinforcement concentration at 25 wt%. Hardness was measured to examine the resistance of composites to indentation. The hardness of phenolic composites increased from 72.2 to 85.2 with increase in basalt fiber loading. Composite C1 (25 wt% fiber) is 1.2 times harder than composite C5. Compression test was conducted to find out compressive strength of phenolic composites and compressive strength increased with increase in fiber content. Dynamic mechanical analysis (DMA) was carried out to assess the temperature dependence mechanical properties in terms of storage modulus (E′), loss modulus (E′′), and damping factor (tan δ). The results indicate great improvement of E′ values and decrease in damping behaviour of composite upon fiber addition. Further X-ray powder diffraction (XRD) and energy-dispersive X-ray (EDX) analysis were employed to characterize the friction composites.

Study of Microstructure and Dynamic Mechanical Analysis of Biodegradable Tableware Produced with Corn Straw

2011 ◽  
Vol 380 ◽  
pp. 160-163 ◽  
Author(s):  
Alun ◽  
Zhi Hui Sun ◽  
Quan Rong Jing ◽  
Ri Dun Hu ◽  
Chun Li Yang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Storage Modulus ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Dynamic Mechanical Property ◽  
Corn Straw ◽  
Dynamic Mechanical ◽  
Scan Electronic Microscope ◽  
Electronic Microscope

This paper focused on biodegradable tableware processed with plant fiber, which were obtained by mechanical processing corn straw, abundant in Heilongjiang Province of China. Firstly, the microstructure characteristics of tableware were described by Scan Electronic Microscope (SEM). Secondly, the dynamic mechanical property of biodegradable tableware was analyzed by DMA, which will provide a reference to optimize the biodegradable tableware design in future. And the dynamic mechanical property of biodegradable tableware also was compared with the dynamic mechanical properties of the plastic snack box. The results showed that biodegradable tableware had a highly storage modulus (E′) originally, it was 3216MPa,while the maximum storage modulus (E′) of plastic snack box was 852MPa. And the results also indicated that the treat temperature has a significant effect on the dynamic mechanical properties of biodegradable tableware, as the treat temperature increased closely to 95°C, the biodegradable tableware appeared glassy transition, but the storage modulus (1650MPa) was still much higher than that of the plastic snack box.

Study and Application of Homogeneous Rare Earth IR/NR Blends in Tread Compound of All-Steel TBR Tire

2011 ◽  
Vol 413 ◽  
pp. 375-382
Author(s):  
Dian Jun Li ◽  
Shang De Song ◽  
Nai Qing Liu ◽  
Shuo Wang ◽  
Zi Hao Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Dynamic Mechanical Properties ◽  
Air Bubbles ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Rubber Tire ◽  
National Quality ◽  
Aging Resistance ◽  
Petrochemical Company

The homogeneous rare earth IR/NR blend applied in tread compound of all-steel TBR tire was investigated,and compare to Russian SKI-3, SKI-5/NR blends and NR.The results showed homogeneous rare earth IR/NR blend had similar vulcanization characteristics, dynamic mechanical properties and heat-aging resistance or even better. It was inspected that the appearance, balance, air bubbles, X-ray and homogeneity inspection test of the tires produced by homogeneous rare earth IR/NR blend by the tire factory,all the indicators were qualified. The tires passed the China National Quality Supervision and Inspection Center of rubber tire certification. The tires met the requirements of all-steel TBR tire.The homogeneous rare earth IR prepared by Petro China Jilin Petrochemical Company could 40 phr instead of NR using in tread compound of all-steel TBR tire,which could extend tire life and reduce tire material costs.

Preparation of super HIPS via nanocomposite assemblies in the presence of toughener- intercalant

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Cuneyt Bagcioglu ◽  
Sinan Sen ◽  
Yusuf Yagci ◽  
Turgut Nugay ◽  
Nihan Nugay
Keyword(s):  
Layered Silicate ◽  
Dynamic Mechanical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Dynamic Mechanical ◽  
Solution Blending ◽  
Atomic Force ◽  
Transmission Electron ◽  
Blending Method

AbstractHighly toughened super high-impact polystyrene (HIPS)/organophilic montmorillonite (Org-MMT) nanocomposite was prepared by solution blending method. Organophilic modification of MMT layered silicate was achieved by using a special toughener-intercalant, quaternary ammonium salt of α-tertiary amine functionalized polybutadiene and shown by X-ray diffraction analysis. The resulting HIPS/Org-MMT nanocomposite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and static and dynamic mechanical analyses. The morphological study of HIPS/Org-MMT nanocomposite showed that nanolayers were exfoliated in nanocomposite and moreover caused much more well dispersed and reduced PS occluded rubber domains. This mechanism was found to be responsible for dramatic increase in toughness of nanocomposites. Additionally, improved thermal and dynamic mechanical properties of the resultant nanocomposite promises to open a new way for highly toughened super HIPSs via nanocomposite assemblies even with a very low degree of clay loading.

Analysis of the dynamic mechanical property of multiple direction impact protection structure inspired by C60 molecule

2019 ◽  
Vol 233 (17) ◽  
pp. 5919-5932
Author(s):  
Xinhui Shen ◽  
Jinguo Liu ◽  
Pengwei Zhang ◽  
Zhiyu Ni ◽  
Yuwang Liu
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Mechanical Property ◽  
Dynamic Mechanical Properties ◽  
Diameter Ratio ◽  
Dynamic Mechanical Property ◽  
Dynamic Mechanical ◽  
Good Ability ◽  
Impact Protection ◽  
Hollow Ball

The natural structures have excellent dynamic mechanical properties. In this work, an impact protection structure inspired by the C60 molecule was proposed. And a model of a hollow ball protected by the bio-inspired C60 molecular structure during a drop testing was built. For the bio-inspired C60 molecular structure, the drop process and the dynamic mechanical property was investigated by LS-DYNA software. The results indicate that the bio-inspired C60 molecular structure has a good ability to protect against impact. Furthermore, the effects of the diameter ratio, materials, drop height, and angle were discussed. These variations of geometry and material can influence the dynamic mechanical properties of the bio-inspired C60 molecular impact protection structure.

Fabrication of bionanocomposites reinforced with hemp nanocellulose and evaluation of their mechanical, thermal and dynamic mechanical properties

2021 ◽  
pp. 146442072110046
Author(s):  
SS Rana ◽  
MK Gupta
Keyword(s):  
Mechanical Properties ◽  
In Situ Polymerization ◽  
Loss Modulus ◽  
Dynamic Mechanical Properties ◽  
X Ray Diffraction ◽  
Dynamic Mechanical ◽  
Hemp Fibres ◽  
Polymerization Method

The present study aims to fabricate the epoxy-based bionanocomposites reinforced with hemp nanocellulose and the evaluation of their mechanical, thermal and dynamic mechanical properties. Nanocellulose from hemp fibres was isolated via the chemo-mechanical method and its bionanocomposites were prepared using the in situ polymerization method. Although many researchers have reported studies on the preparation and characterization of bionanocomposites however, studies on the mechanical, thermal, and dynamic mechanical properties of epoxy-based bionanocomposites reinforced with hemp nanocellulose are still unreported. The mechanical properties (i.e. tensile, flexural, hardness, and impact) and dynamic mechanical properties (i.e. glass transition temperature, damping behaviour, storage, and loss modulus) of the developed bionanocomposites were investigated. Further, the crystalline behaviour and thermal stability were also studied using the X-ray diffraction and thermogravimetric analysis techniques, respectively. The results revealed that an addition of nanocellulose considerably improved the mechanical, thermal, and viscoelastic properties of the bionanocomposites. As much as 52.17%, 48.17%, 89.08%, and 15.67% improvements in the tensile strength, flexural strength, impact strength, and hardness, respectively, for the 2 wt.% nanocellulose composites were found over the epoxy matrix.

Interactions of Nonaqueous Solvents with Textile Fibers

1977 ◽  
Vol 47 (11) ◽  
pp. 745-754 ◽  
Author(s):  
H.-D. Weigmann ◽  
M. G. Scott ◽  
A. S. Ribnick ◽  
R. D. Matkowsky
Keyword(s):  
Diffusion Mechanism ◽  
Dynamic Mechanical Properties ◽  
Fiber Structure ◽  
X Ray Diffraction ◽  
Segmental Mobility ◽  
Solvent Treatment ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Dye Diffusion ◽  
Diffraction Patterns

Investigation of the temperature dependence of the coefficients of diffusion for dye in untreated and solvent-treated polyester yarns has shown that solvent treatments that increase dyeability do not change the dye-diffusion mechanism. The free-volume mechanism, which depends on polymer segmental mobility for the transport of dye through temporary holes, is operative in solvent-treated as in untreated polyester. The significant increase in dye-diffusion coefficients resulting from solvent treatment is attributed to increased segmental mobility in noncrystalline domains of the treated fiber. This increased segmental mobility is reflected in lowered α-dispersion temperatures, as determined from dynamic mechanical properties. Treatments with dimethylformamide and heat treatments at temperatures approximately 80°C higher both yield polyester yarns that have the same segmental mobility, as indicated by dynamic mechanical measurements, but the saturation dye uptake in the solvent-treated yarns is much higher. This increased amount of dye is believed to be held in voids in the fiber structure formed during solvent treatment. Diffuse scattering in small-angle x-ray diffraction patterns of solvent-treated yarns has been taken as evidence for the existence of such voids.

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