scholarly journals Preparation and Chemical Protective Clothing Application of PVDF Based Sodium Sulfonate Membrane

Membranes ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 190
Author(s):  
Yue Zhao ◽  
Xinbo Wang ◽  
Deyin Wang ◽  
Heguo Li ◽  
Lei Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyvinylidene Fluoride ◽  
Protective Clothing ◽  
Low Cost ◽  
Chemical Warfare Agents ◽  
Contact Angles ◽  
Protective Material ◽  
Sodium Sulfonate ◽  
Vapor Permeation ◽  
Chemical Protective Clothing

Chemical protective clothing (CPC) is major equipment to protect human skin from hazardous chemical warfare agents (CWAs), especially nerve agents and blister agents. CPC performance is mainly dominated by the chemical protective material, which needs to meet various requirements, such as mechanical robustness, protective properties, physiological comfort, cost-effectiveness, and dimensional stability. In this study, polyvinylidene fluoride (PVDF) based sodium sulfonate membranes with different ion exchange capacities (IECs) are prepared simply from low-cost materials. Their mechanical properties, contact angles, permeations, and selectivities have been tested and compared with each other. Results show that membranes with IEC in the range of 1.5–2 mmol g−1 have high selectivities of water vapor permeation over CWA simulant vapor permeation and good mechanical properties. Therefore, PVDF-based sodium sulfonate membranes are potential materials for CPC applications.

Study on the Processing Technology and Mechanical Properties of Nonwoven Fabric Composited by Recycled PP Selvedges

2011 ◽  
Vol 287-290 ◽  
pp. 2748-2751 ◽  
Author(s):  
Jia Horng Lin ◽  
Chia Chang Lin ◽  
Jin Mao Chen ◽  
Ting Ting Li ◽  
Ming I Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mass Production ◽  
Protective Clothing ◽  
Low Cost ◽  
Nonwoven Fabric ◽  
Raw Material ◽  
Building Structure ◽  
Needle Punching ◽  
Short Processing Time ◽  
High Output

Functional nonwoven products have superiority such as quick mass-production, short processing time, wide sources for raw material, low cost and high output etc. They have been widely studied and promoted in advanced countries. However, comparing with selvedge processing, they brings considerable burden to environment. So in this paper, we chose low cost polyester (LPE) and low melting point fiber (LMPE) respectively blending by 50 wt% through the process of mixing, blowing, carding, laying, and needle punching etc. to form nonwoven fabric in which the needle density was adjusted. Finally it is found that 103 needles/cm2 was optimal after mechanical testing. And then different proportions of PP selvedges were placed in the middle of two optimal nonwoven layers by sandwich structure, and mechanical properties of PET/LMPET/PP fabric produced after thermo bonding and cooling was tested. According to the optimal production evaluation for functionality, these products may apply to reinforced interlayer in general protective clothing, protective glove, reinforcement in simple building structure and stiffening geotextiles in the future.

scholarly journals Effect of Carbon Nanotube Loading on Electrical Properties of Electrospun Polyvinylidene Fluoride (PVDF) Fiber

2021 ◽  
Vol 2080 (1) ◽  
pp. 012015
Author(s):  
Jia Wei Lee ◽  
S.B Sharifah Shahnaz ◽  
A.Z Nur Hidayah ◽  
S. Yahud ◽  
Noorasikin Samat
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Polyvinylidene Fluoride ◽  
Low Cost ◽  
Peak Shift ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Surface Areas ◽  
Β Phase ◽  
Graphite Sheets

Abstract Polyvinylidene fluoride (PVDF) is a high purity thermoplastic fluropolymer that use in the aircraft, electronics, and chemical industry. Carbon nanotube (CNTs) is made up of rolled up of graphite sheets, exhibits excellent chemical, thermal, mechanical properties, and large surface areas. PVDF fibers blended with CNTs were able to enhance the β-phase which contributes to piezoelectric properties. Electrospinning is the simplest and low-cost method to produce PVDF/CNT fibers by dissolving PVDF in solvent N, N-Dimethylformamide (DMF). 15wt% PVDF solution was used. CNT loading were varied at 0.0wt%, 0.35wt%, 0.80wt% and 1.00wt% with parameters of 20kV, tip-to-collector distance (TCD) 15cm and flow rate 1.0mLh-1. Scanning Electron Microscope (SEM), four-point probe and X-ray Diffraction (XRD) were used to determine the morphology and crystallinity of electrospun PVDF/CNT fibers. The SEM analysis concluded all fibers showed beaded structure due to low concentration of PVDF solution with insufficient ultrasonification and stirring, cause electrospraying and agglomeration. XRD and four-point probe analysis concluded PVDF/0.35wt%CNT showed the highest β-phase content with intense XRD peak and highest electrical conductivity. However, shift peak is observed among all fibres due to short electrospinning time leads to insufficient thickness of electrospun mat, which affects the mechanical properties of fibres and causes peak shift.

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