Adhesion and protective properties of electrospun PVA/ES composites obtained by using spiral disk spinnerets

2016 ◽  
Vol 87 (14) ◽  
pp. 1685-1695 ◽  
Author(s):  
Chuchu Zhao ◽  
Yao Lu ◽  
Zhijuan Pan
Keyword(s):  
Composite Membranes ◽  
Air Permeability ◽  
Hot Press ◽  
Adhesion Properties ◽  
Protective Properties ◽  
Molecular Weights ◽  
Initial Modulus ◽  
Peeling Strength ◽  
Press Method ◽  
Nanofiber Web

The parameters of electrospinning polyvinylalcohol (PVA) of different molecular weights using spiral disk spinnerets were explored. Ethylene-propylene side-by-side (ES) nonwoven was used as the substrate. Electrospun PVA/ES composite membranes were fabricated by laminating a nanofiber web onto the nonwoven substrate via the hot-press method. The adhesion properties between the PVA nanofiber mat and the ES nonwoven were studied. The results showed that the adhesion properties were significantly affected by temperature, pressure, and processing time. The resultant composite membranes, when treated at 145℃ with a pressure of 100 Pa for 10 minutes, exhibited a preferable adhesion energy of 7.95 J/m2 and a maximum peeling strength of 20.17 cN, as well as a maximum air permeability of 73.92 dm3/(m2s). Simultaneously, the effect of electrospinning time on the characteristics of PVA/ES composites was also explored. The filtration efficiency increased with the prolongation of the electrospinning time, whereas the air permeability decreased. All of the samples were grade A in terms of the electrostatic half-life period (which was less than two seconds), and the softness slowly declined with the addition of nanofibrous layers. The breaking stress, the initial modulus, and the elongation were enhanced with the prolongation of electrospinning time.

Hot-Press Method Applied to Anisotropy of Compressed Carbon Product

1968 ◽  
Vol 17 (177) ◽  
pp. 536-539
Author(s):  
Shinichi OTSUKI ◽  
Shoji HORI ◽  
Kanji MATSUO
Keyword(s):  
Hot Press ◽  
Carbon Product ◽  
Press Method

scholarly journals Preparation of Porous Hydroxyapatite Nanosolid by Solvent Hot Press Method

2004 ◽  
Vol 20 (06) ◽  
pp. 608-611
Author(s):  
Liu Xiu-Lin ◽  
◽  
Xu Hong-Yan ◽  
Meng Xian-Ping ◽  
Li Mei ◽  
...  
Keyword(s):  
Hot Press ◽  
Porous Hydroxyapatite ◽  
Press Method

Controllable synthesis of uniform ZnO nanorods and their enhanced dielectric and absorption properties

2014 ◽  
Vol 2 (23) ◽  
pp. 8644-8651 ◽  
Author(s):  
Guang-Sheng Wang ◽  
Ying-Ying Wu ◽  
Xiao-Juan Zhang ◽  
Yong Li ◽  
Lin Guo ◽  
...  
Keyword(s):  
Percolation Threshold ◽  
Reflection Loss ◽  
Filler Content ◽  
Zno Nanorods ◽  
Dielectric Behavior ◽  
Hot Press ◽  
Controllable Synthesis ◽  
Absorption Properties ◽  
Press Method ◽  
Two Peaks

The PVDF/ZnO composites were prepared by a simple hot-press method. The dielectric behavior of the composites was improved at a lower percolation threshold. For the composites with a filler content of 10 wt%, the reflection loss appears as two peaks that can reach −15.90 dB at 6.60 GHz and −25.44 dB at 16.48 GHz.

High Functional PET Sericin Composite Fabric

2012 ◽  
Vol 430-432 ◽  
pp. 49-52
Author(s):  
Gang Xian Zhang ◽  
Xiao Hua Shi ◽  
Wei Hu ◽  
Feng Xiu Zhang ◽  
Da Yang Wu
Keyword(s):  
High Pressure ◽  
Glycidyl Ether ◽  
Air Permeability ◽  
Sucrose Ester ◽  
Random Coil ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pet Fabric ◽  
Initial Modulus ◽  
Ft Ir

Though poly(ethyleneteraphthalate)(PET) fabrics have high initial modulus, outstanding creasability and wash-well character, but its hydrophilicity and biocompatibility are very poor. In this paper, the PET fabric was encased sucrose ester at high pressure and high temperature to endue it enough hydroxyl to grafting protein. The sericin was grafted on PET fabric by sucrose eater glycidyl ether (SEGE). The FT-IR spectra showed that sericin was grafted on PET fabric, and the structure of sericin was random coil conformation. X-ray diffraction spectra showed the structure of PET fiber did not changed. DSC showed the thermostability increased a little. After the PET fabric grafted with sericin, the hydrophilicity of PET sericin composite fabric was improved greatly, the cockle elasticity kept well, and the broken strength in creased a little. Certainly, the whiteness and air permeability decreased a little. The PET sericin composite fabric was high functional.

Properties of Bi-Pb-Sr-Ca-Cu-O Bulk Superconductors Prepared by a Hot-Press Method

1990 ◽  
pp. 701-704
Author(s):  
R. Yoshizaki ◽  
H. Ikeda ◽  
K. Yoshikawa ◽  
N. Tomita
Keyword(s):  
Hot Press ◽  
Bulk Superconductors ◽  
Press Method

Thermal, mechanical, and dielectric properties of low loss PbZr 0 . 3 Ti 0 . 7 O 3 /polystyrene composites prepared by hot‐press method

2020 ◽  
Author(s):  
Saumya Shalu ◽  
Kakoli Dasgupta ◽  
Sunanda Roy ◽  
Pradip Kar ◽  
Trishna Bal ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Hot Press ◽  
Low Loss ◽  
Press Method

EIS Study of Bulk Al-SiC Nanocomposite Prepared by Mechanical Alloying and the Hot Press Method

2009 ◽  
Vol 83-86 ◽  
pp. 1297-1305 ◽  
Author(s):  
Taha Rostamzadeh ◽  
H. Shahverdi ◽  
A. Shanaghi ◽  
T. Shahrabi
Keyword(s):  
Corrosion Resistance ◽  
Mechanical Alloying ◽  
Metal Matrix ◽  
Charge Transfer Resistance ◽  
Corrosion Mechanism ◽  
Matrix Composites ◽  
Hot Press ◽  
Ceramic Component ◽  
Transfer Resistance ◽  
Press Method

Metal matrix composites (MMCs) are engineering materials in which a hard ceramic component is dispersed in a ductile metal matrix in order to obtain characteristics such as hardness and corrosion resistance. Corrosion resistance is one of the important properties of nanocomposites; however, the corrosion mechanism of the Al- SiC nanocomposite has not yet been determined. .In this study, bulk Al-5% SiC nanocomposite was prepared using mechanical alloying and the hot press method. Corrosion behavior was then investigated using EIS techniques such as Nyquist and the Bod diagram. A larger charge transfer resistance was found for the Al- SiC nanocomposite by the EIS diagrams, confirming its corrosion resistance in a 3.5wt% NaCl solution.

scholarly journals Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2503
Author(s):  
Liyang Cao ◽  
Yongsheng Liu ◽  
Jing Wang ◽  
Yu Pan ◽  
Yunhai Zhang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Low Cost ◽  
Hot Press ◽  
Vacuum Filtration ◽  
Finite Element Software ◽  
Multi Walled Carbon Nanotubes ◽  
Press Method ◽  
Thermal And Electrical Properties ◽  
Walled Carbon Nanotubes ◽  
Homogeneous Temperature

The applications of pure multi-walled carbon nanotubes (MWCNTs) buckypapers are still limited due to their unavoidable micro/nano-sized pores structures. In this work, polyvinyl alcohol (PVA) was added to a uniform MWCNTs suspension to form MWCNT/PVA buckypapers by vacuum infiltration combined with a hot press method. The results showed an improvement in the thermal, electrical, and electromagnetic interference (EMI) shielding properties due to the formation of dense MWCNTs networks. The thermal and electrical properties rose from 1.394 W/m·k to 2.473 W/m·k and 463.5 S/m to 714.3 S/m, respectively. The EMI performance reached 27.08 dB. On the other hand, ABAQUS finite element software was used to simulate the coupled temperature-displacement performance. The electronic component module with buckypapers revealed a homogeneous temperature and thermal stress distribution. In sum, the proposed method looks promising for the easy preparation of multi-functional nanocomposites at low-cost.

Investigation of mechanical and thermal insulating properties of wool fibres in epoxy composites

2020 ◽  
pp. 096739112097138
Author(s):  
Dionisis Semitekolos ◽  
Katerina Pardou ◽  
Pantelitsa Georgiou ◽  
Panagiota Koutsouli ◽  
Iosif Bizelis ◽  
...  
Keyword(s):  
Epoxy Composites ◽  
Wool Fibre ◽  
Hot Press ◽  
Insulating Material ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity ◽  
Strength Tests ◽  
Press Method ◽  
Insulating Properties ◽  
Sheep Wool

The purpose of this study is to investigate a novel exploitation approach for a mass livestock byproduct, namely sheep wool fibres. In order to fulfil this aim, wool fibre toughened epoxy composites with an amount of 2.4, 4.1 and 5.7 phr were prepared via the hot press method. Initially, mechanical assessment of the composites was executed, in order to evaluate their mechanical integrity. The flexural and shear strength tests showed that the wool fibre-epoxy composites maintain their mechanical properties for up to 4.1 phr and no degradation is detected. Subsequently, the thermal properties were tested. Thermogravimetric analysis proved that adding wool fibres as toughening agent in epoxy matrix can prolong the endurance of the material while reaching high temperatures. The coefficient of thermal conductivity decreased by 30% compared to neat epoxy, something that is also confirmed through simulation, proving that wool fibre-epoxy composites can be considered as a promising insulating material, while exploiting a natural waste.

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