Study on bonding ability of melt-spun polypropylene/polyethylene blend fibers

2020 ◽  
pp. 152808372095521
Author(s):  
Tomik Moradi ◽  
Mirhadi Seyed Esfahani ◽  
Hamid Ebrahimi ◽  
Ali Khosroshahi ◽  
Siyamak Safapour
Keyword(s):  
Melt Spinning ◽  
Bonding Temperature ◽  
Bonding Process ◽  
Linear Low Density Polyethylene ◽  
Thermal Bonding ◽  
Scanning Calorimetry ◽  
Polyethylene Blend ◽  
Before And After ◽  
Different Temperatures ◽  
Nucleating Effect

This article investigates melt spinning of polypropylene (PP) with high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) blend fibers at different compositions, as well as the effects of HDPE and LLDPE on the bonding ability of blend fibers in thermal bonding process at different temperatures have been studied. HDPE and LLDPE were added to PP at 3, 5, 7, and 10 wt% to measure the upper threshold of such blends. While HDPE was added up to 7 wt%, PP/LLDPE blend fibers were only spun up to 3 wt% of LLDPE. Differential scanning calorimetry (DSC) revealed that increasing both HDPE and LLDPE contents lead to higher crystallinity values due to polyethylenes nucleating effect on PP. By adding HDPE and LLDPE, the tensile strength of blend fibers before and after bonding was decreased drastically compared to pure PP fibers. On the other hand, the addition of HDPE to PP and increasing bonding temperature enhanced bonding strength.

Study on Corrosion Resistance of Several Fe-Based Amorphous Alloys

2014 ◽  
Vol 789 ◽  
pp. 633-637
Author(s):  
Xiu Juan Tian ◽  
Wan Fu Liu ◽  
Kun Xie
Keyword(s):  
Corrosion Resistance ◽  
Amorphous Alloys ◽  
Melt Spinning ◽  
Open Circuit ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Annealing Temperatures ◽  
Structure Changes ◽  
Before And After ◽  
Different Temperatures

Three ribbons were obtained by rapid solidification using the melt-spinning techniques, and annealed with different temperatures. The corrosion behavior of ribbons in 0.1mol/L NaCl solution and the effects of annealing temperatures on the corrosion resistance were studied by open circuit potential and polarization curve test. Phase structure changes of the ribbons before and after corrosion were analyzed by X-ray diffraction (XRD). The amorphous forming ability and crystallization temperature of materials were characterized by differential scanning calorimetry (DSC). The surface morphology and composition before and after corrosion were analyzed by scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). The result showed that Fe90Si5.5B4.5and Fe91Si5.5B3.5had high corrosion resistance. Corrosion resistance of the three ribbons had increased along with the increase of annealing temperatures.

Nucleating effect of surface modified MWNTs on crystallization of MWNTs/PA6 composites

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Juan Li ◽  
Qun Gu ◽  
Xinyu Fan ◽  
Zhenghong Guo ◽  
Zhengping Fang
Keyword(s):  
Polyamide 6 ◽  
Surface Characteristic ◽  
Crystalline Form ◽  
Scanning Calorimetry ◽  
Amino Functionalization ◽  
Before And After ◽  
Multi Walled Carbon Nanotubes ◽  
Surface Modified ◽  
Walled Carbon Nanotubes ◽  
Nucleating Effect

AbstractThe surface characteristic of multi-walled carbon nanotubes (MWNTs) plays an important role in the crystallization of polyamide 6 (PA6). In this paper, 1,6-hexamethylenediamine(HMD) are grafted on MWNTs. The MWNTs before and after modification are used to fabricate PA6 composites through melt-blending. The nucleating effect of MWNTs with different surface characteristic is investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and Xray diffraction (XRD).The heterogeneous nucleating ability of MWNTs determined by the Dobreva method are higher for pristine than amine-functionalized MWNTs/PA6 composites with 1.0 wt% MWNTs. Addition of MWNTs induce more heterogeneous nucleation and retards the crystal growth of PA6. The presence of MWNTs facilitates the formation of α crystalline form, while amino-functionalization weakens this trend. MWNTs act as effective nucleation agents for PA6, resulting in the increased number and decreased size of spherulites. MWNTs facilitate the formation of α crystalline form of PA6. Amino-functionalization decreases the crystallization and nucleating effect of MWNTs on PA6

Optimization of Process Parameters of Diffusing Bonding of Titanium with Titanium and Titanium with Copper

2013 ◽  
Vol 856 ◽  
pp. 153-158
Author(s):  
Kasigavi Chandrappa ◽  
Joel Hemanth
Keyword(s):  
Applied Stress ◽  
Diffusion Bonding ◽  
Bonding Temperature ◽  
Bonding Process ◽  
Micro Hardness ◽  
Hardness Testing ◽  
Cu Alloy ◽  
Optimization Of Process Parameters ◽  
Different Temperatures ◽  
Through Diffusion

The diffusion bonding of Ti to Ti, Ti-Cu alloy at different temperatures ranging from 673 K to 923 K under an applied stress of 100 MPa for 1 h was studied. The observation of the microstructure reveals that sound joints between the Ti-Ti and dissimilar titanium/Copper metals sheet were successfully joined by diffusion bonding process. Ti-Cu alloy without any pores or cracks can be achieved through diffusion bonding at temperatures over 873 K under the applied stress of 100 MPa for 1 h. The bond is composed of the zones, and its width increases with the increase of bonding temperature. The Micro hardness at the interface of joints bonded under different conditions was evaluated through Micro hardness testing and the fracture mode was analyzed by SEM observation.

scholarly journals Zn22Al4Ag ALLOY MICROWIRES CASTING TO RAPID SOLIDIFICATION PROCESS BY ROTATING DRUM

10.6036/10098 ◽  
2022 ◽  
Vol 97 (1) ◽  
pp. 53-57
Author(s):  
JUAN MANUEL PRADO LAZARO ◽  
JOSE ANGEL RAMOS BANDERAS ◽  
ISRAEL AGUILERA NAVARRETE ◽  
JAIME ALEJANDRO VERDUZCO MARTINEZ ◽  
ROCIO MARICELA OCHOA PALACIOS
Keyword(s):  
Rapid Solidification ◽  
Melt Spinning ◽  
Thermodynamic Simulation ◽  
Solidification Process ◽  
Rapid Solidification Process ◽  
Rotating Drum ◽  
Scanning Calorimetry ◽  
Jet Stability ◽  
Before And After ◽  
Spinning Process

In this work, the Zn22Al4Ag alloy was synthesized by melting in a muffle furnace.The alloy obtained was characterized by Scanning Electron Microscopy Energy Dispersive Spectroscopy and was analyzed by the X-Ray Diffraction technique, where the crystallinity of the material was verified before and after being processed. Likewise, the Differential Scanning Calorimetry technique was used to obtain the temperatures where phase transformations occurin the alloy. These results were fed to the Termocalc®, software to numerically obtain the phase diagram of the alloy. Subsequently, a section of the ingot was taken to the rapid solidification process by rotating drum. The process variables were manipulated: jet stability, nozzle diameter, distance from the nozzle surface to the cooling medium, the delay time of the molten material in the crucible, speed of the rotating drum and jet angle, until obtaining a microwire with a diameter of ~ 160µm. Finally, it was determined that inadequate control of these parameters can result in powders, flakes or blockage of the crucible outlet. Potentially uses within the micro and nanoworld as an analogy to structural elements and electrical conductors, in addition to its current use as a coating anti-corrosive. Key Words: ZnAlAg alloy, Melt spinning process, Microwire, DSC analysis, Thermodynamic simulation

Investigation of Thermal Bonding on PMMA Capillary Electrophoresis Chip

2009 ◽  
Vol 60-61 ◽  
pp. 288-292 ◽  
Author(s):  
Hai Feng Zhang ◽  
Xiao Wei Liu ◽  
Zhi Cheng Peng ◽  
Wei Wang ◽  
Yu Feng Chen
Keyword(s):  
Capillary Electrophoresis ◽  
Process Parameters ◽  
Influence Factor ◽  
Orthogonal Experiment ◽  
Bonding Temperature ◽  
Thin Foil ◽  
Thermal Bonding ◽  
Conductivity Detection ◽  
Contactless Conductivity Detection ◽  
Before And After

PMMA, Capillary Electrophoresis, Thermal bonding, Factor, Deformation. Abstract. In this paper, using the powder hot embossing machine, the effects of the bonding temperature, pressure and time on the deformation of microchannel dimensions is studied systematically. The bonding temperature is mainly influence factor on the deformation of microchannel determined by the method of orthogonal experiment. Some mathematical models are described to optimize the thermal bonding process parameters. According theory and experimental curve, the optimal experimental model (83°C, 0.4Mpa and 7 min) is suggested. Under the process parameters the deformation of crossing section dimension before and after thermal bonding is 37.8%. The channel is successfully sealed underneath with a thin foil 30μm thickness PMMA for contactless conductivity detection. The entire fabrication methodology may also be useful for preparation of other polymer microfluidic systems. Finally, the performance of the PMMA chip is demonstrated to separate continuously K+ ions using the contactless conductivity detection.

Evaluation of Manufacturing Technology and Characterization of Composite Fabric for Stab Resistant Materials

2008 ◽  
Vol 55-57 ◽  
pp. 429-432 ◽  
Author(s):  
Chia Chang Lin ◽  
Ching Wen Lou ◽  
Wen Hao Hsing ◽  
W.H. Ma ◽  
Chin Mei Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bonding Temperature ◽  
Polyamide 6 ◽  
Primary Component ◽  
Bonding Process ◽  
Woven Fabric ◽  
Process Conditions ◽  
Thermal Bonding ◽  
Needle Punching ◽  
Stab Resistance

d more to their own safety, lead all kinds of personal protection apparatus to rapidly develop. This study designed and manufactured the stabbing resistant fabrics to prevent the pricking damage of human body. In this study, woven Kevlar fabric is laid between two layers of polyamide 6 fibrous webs that contain low-melt polyester fibers. The fibrous webs and woven fabric are bonded via needle punching and thermal bonding to generate a nonwoven/woven composite fabric that can be used as a substrate for artificial leather. The polyamide 6 staple fiber is the primary component of the nonwoven structure. The low-melt polyester fiber was added via thermal bonding to reinforce the composite fabric structure. The stab resistance of the composite fabric was reinforced by the woven Kevlar fabric. Because the bonding process alters the mechanical properties of the composite fabric, effects of bonding process conditions, such as needle punching density and thermal bonding temperature, on the mechanical properties and stab resistance of the composite fabric were investigated. The stab resistance of the composite fabric was assessed by stab resistance tests using the ASTM F1432 standard. Experimental results demonstrate that the optimal parameters obtained from sample which needle punching density is 200 needles/cm2

scholarly journals Influence of Annealing Temperature on the Magnetic Properties of Rapidly Quenched (Nd,Pr)2-(Fe,Co,Ga,Ti,C)14B/α-Fe Nanocomposite Ribbons

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Rahim Sabbaghizadeh ◽  
Mansor Hashim ◽  
Reza Gholamipour ◽  
Ghazaleh Bahmanrokh ◽  
Mohd Shamsul Ezzad Shafie
Keyword(s):  
Magnetic Properties ◽  
Melt Spinning ◽  
Annealing Temperature ◽  
Practical Method ◽  
Nominal Composition ◽  
Metallic Materials ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Microscopy Technique ◽  
Different Temperatures

The effects of different heat treatment temperatures on the structure and magnetic properties of Nd-Fe-B nanocomposite permanent magnetic alloys with nominal composition of Nd9.4Pr0.6Fe74.5Co6B6Ga0.5Ti1.5C1.5have been investigated. The most practical method to produce nanostructured metallic materials is rapid solidification. Melt spinning with constant wheel speed ofV=40 m/s was employed to produce ribbons. As-spun ribbons were examined by using differential scanning calorimetry (DSC) and X-ray diffractometer (XRD) with Cu-kαradiation. The ribbons were annealed at different temperatures in order to extract the best magnetic properties. The XRD and electron microscopy technique results confirm that grains are in the size of less than 50 nm. In addition, optimum magnetic properties were obtained at 700°C annealed temperature.

A New Polyethylene Corrosion Protecting Coating with Ion Selectivity

2011 ◽  
Vol 314-316 ◽  
pp. 273-278
Author(s):  
Yu Hua Dong ◽  
Ke Ren ◽  
Qiong Zhou
Keyword(s):  
Ion Selectivity ◽  
Nano Particles ◽  
Ammonium Bromide ◽  
Linear Low Density Polyethylene ◽  
X Ray Diffraction ◽  
Sulfosalicylic Acid ◽  
X Ray ◽  
Chemically Modified ◽  
Before And After ◽  
Industrial Standards

Linear low density polyethylene (LLDPE) was chemically modified with grafting maleic anhydride (MAH) monomer on its backbone by melting blending. Nano-particles SiO2 was modified by cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) and anionic surfactant sulfosalicylic acid (SSA) and added to PE coating respectively. Measurement of membrane potential showed that the coating containing modified SiO2 nano-particles had characteristic of ion selectivity. The properties of the different coatings were investigated according to relative industrial standards. Experimental results indicated that PE coating with ion selectivity had better performances, such as adhesion strength, cathodic disbonding and anti-corrosion, than those of coating without ion selectivity. Crystal structure of the coatings before and after alkali corrosion was characterized by Fourier transform infrared spectra (FTIR) and X-ray diffraction (XRD). Structure of the coating without ion selectivity was damaged by NaOH alkali solution, causing mechanical properties being decreased. And the structure of the ion selective coatings was not affected.

scholarly journals Dynamic Single-Fiber Pull-Out of Polypropylene Fibers Produced with Different Mechanical and Surface Properties for Concrete Reinforcement

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 722
Author(s):  
Enrico Wölfel ◽  
Harald Brünig ◽  
Iurie Curosu ◽  
Viktor Mechtcherine ◽  
Christina Scheffler
Keyword(s):  
Tensile Strength ◽  
Dynamic Loading ◽  
Melt Spinning ◽  
Structural Changes ◽  
High Surface ◽  
Single Fiber ◽  
Scanning Calorimetry ◽  
Matrix Interaction ◽  
Pull Out ◽  
Fiber Matrix

In strain-hardening cement-based composites (SHCC), polypropylene (PP) fibers are often used to provide ductility through micro crack-bridging, in particular when subjected to high loading rates. For the purposeful material design of SHCC, fundamental research is required to understand the failure mechanisms depending on the mechanical properties of the fibers and the fiber–matrix interaction. Hence, PP fibers with diameters between 10 and 30 µm, differing tensile strength levels and Young’s moduli, but also circular and trilobal cross-sections were produced using melt-spinning equipment. The structural changes induced by the drawing parameters during the spinning process and surface modification by sizing were assessed in single-fiber tensile experiments and differential scanning calorimetry (DSC) of the fiber material. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle measurements were applied to determine the topographical and wetting properties of the fiber surface. The fiber–matrix interaction under quasi-static and dynamic loading was studied in single-fiber pull-out experiments (SFPO). The main findings of microscale characterization showed that increased fiber tensile strength in combination with enhanced mechanical interlocking caused by high surface roughness led to improved energy absorption under dynamic loading. Further enhancement could be observed in the change from a circular to a trilobal fiber cross-section.

Effects of additives on the cure kinetics of vinyl ester pultrusion resins

2021 ◽  
pp. 002199832110015
Author(s):  
Alexander Vedernikov ◽  
Yaroslav Nasonov ◽  
Roman Korotkov ◽  
Sergey Gusev ◽  
Iskander Akhatov ◽  
...  
Keyword(s):  
Vinyl Ester ◽  
Mean Squared Error ◽  
Cure Kinetics ◽  
Zinc Stearate ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Different Temperatures ◽  
Predicted Values ◽  
Kinetics Of ◽  
Final Degree

Pultrusion is a highly efficient composite manufacturing process. To accurately describe pultrusion, an appropriate model of resin cure kinetics is required. In this study, we investigated cure kinetics modeling of a vinyl ester pultrusion resin (Atlac 430) in the presence of aluminum hydroxide (Al(OH)3) and zinc stearate (Zn(C18H35O2)2) as processing additives. Herein, four different resin compositions were studied: neat resin composition, composition with Al(OH)3, composition comprising Zn(C18H35O2)2, and composition containing both Al(OH)3 and Zn(C18H35O2)2. To analyze each composition, we performed differential scanning calorimetry at the heating rates of 5, 7.5, and 10 K/min. To characterize the cure kinetics of Atlac 430, 16 kinetic models were tested, and their performances were compared. The model based on the [Formula: see text]th-order autocatalytic reaction demonstrated the best results, with a 4.5% mean squared error (MSE) between the experimental and predicted data. This study proposes a method to reduce the MSE resulting from the simultaneous melting of Zn(C18H35O2)2. We were able to reduce the MSE by approximately 34%. Numerical simulations conducted at different temperatures and pulling speeds demonstrated a significant influence of resin composition on the pultrusion of a flat laminate profile. Simulation results obtained for the 600 mm long die block at different die temperatures (115, 120, 125, and 130 °C) showed that for a resin with a final degree of cure exceeding 95% at the die exit, the maximum difference between the predicted values of pulling speed for a specified set of compositions may exceed 1.7 times.

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