Structure and Performance in the Compacting Process of Polyacrylonitrile Fiber

2011 ◽  
Vol 332-334 ◽  
pp. 437-440
Author(s):  
Zhao Huan Zhang ◽  
Run Jun Sun ◽  
Mei Yu Chen ◽  
Cheng Kun Liu
Keyword(s):  
Breaking Strength ◽  
Process Condition ◽  
Wet Spinning ◽  
Polyacrylonitrile Fiber ◽  
Shrinkage Ratio ◽  
Pan Fiber ◽  
Post Process ◽  
Process Loss ◽  
And Performance ◽  
Temperature Time

As a key stage in wet spinning, compacting process served as a connection between spin and post treatment, it has significant influence on the performances of polyacrylonitrile (PAN) fiber. In this paper, the influences of temperature, time and tension on the compacting process and performance of fibers were studied. The test shows that the suitable compacting process condition is 110°C for 90s with a higher shrinkage ratio. With increasing shrinkage ratio, density and breaking elongation raise, but orientation and breaking strength decrease. To obtain better effect of compacting process, loss of orientation and breaking strength can hardly be avoided; it can be compensated by secondary draw in post process.

Preparation and Performance of Super-Absorbent Resin Using Polyacrylonitrile Fiber Wastes

2015 ◽  
Vol 1120-1121 ◽  
pp. 498-501
Author(s):  
Kun Yan Wang ◽  
Ru Feng Cen ◽  
Wen Wen Shu
Keyword(s):  
Water Retention ◽  
Polyacrylonitrile Fiber ◽  
Water Absorbency ◽  
Distilled Water ◽  
Weight Loss Step ◽  
Pan Fiber ◽  
New Material ◽  
Cross Linker ◽  
And Performance ◽  
Pan Fibers

In order to develop a new way for utilizing Polyacrylonitril (PAN) fiber wastes, a super-absorbent resin was prepared using the waste of PAN fibers at alkaline hydrolysis condition with Al3+ as cross-linker. The molecular structure of the super-absorbent resin was confirmed by FTIR. The thermal degradation of super-absorbent resin consisted of one main weight loss step. Factors that can influence absorbencies of the super-absorbent resin were investigated, such as the amount of cross-linker. The super-absorbent resin has the water absorbency of 131g/g in distilled water. The super-absorbent resin can be used as a new material to water retention from the soil in agriculture.

Applied Research on Modified Polyacrylonitrile Fiber with Collagen

2012 ◽  
Vol 217-219 ◽  
pp. 555-558 ◽  
Author(s):  
Xue Min Hu ◽  
Chang Fa Xiao
Keyword(s):  
Surface Modification ◽  
Comparative Analysis ◽  
Applied Research ◽  
Breaking Strength ◽  
Solution Concentration ◽  
Optimum Process ◽  
Polyacrylonitrile Fiber ◽  
Collagen Solution ◽  
Pan Fiber ◽  
Modification Process

The surface modification process for polyacrylonitrile fiber which was hydrolyzed first, and then grafted with collagen was studied. The optimum process was as follows: concentration of alkaline 12%, time 10min, temperature 80°C, ratio of water and PAN fiber was 100:1. The method for surface modification of polyacrylonitrile fiber was determined from comparative analysis, and the optimum process: collagen solution concentration at 5%, pick-up at 900%, pre-baking 15min at 70°C, baking 15min at 110°C. Compared with original polyacrylonitrile fiber，the breaking strength and elongation of collagen modified polyacrylonitrile fiber decreased, while the moisture regain increased from 2% to 6.1%.

Study on Antistatic Property of PAN /PANI Composite Fiber

2011 ◽  
Vol 332-334 ◽  
pp. 264-267
Author(s):  
Ya Zhen Wang ◽  
Dong Shuang Xu
Keyword(s):  
Breaking Strength ◽  
Specific Resistance ◽  
Composite Fiber ◽  
Bodyweight Gain ◽  
Polyacrylonitrile Fiber ◽  
Antistatic Property ◽  
Pan Fiber ◽  
Pani Composite

In this paper,antistatic property of PAN/PANI composite fiber was studied through the grafted polymerization of Polyacrylonitrile and Polyaniline (PANI). The preconditioning and the dosage of ANI influenced on the rate of bodyweight gain, breaking strength and tensile rate,mass specific resistance of the composite fiber were discussed. The mass specific resistance of conventional polyacrylonitrile fiber is 1011Ω•cm,the mass specific resistance of PAN/PANI composite fiber could be reduced to 106-108Ω•cm. It could prove that the antistatic property of PAN fiber has been greatly improved by PANI.

scholarly journals SURFACE ROUGHNESS CONSIDERATIONS IN DESIGN FOR ADDITIVE MANUFACTURING - A LITERATURE REVIEW

2021 ◽  
Vol 1 ◽  
pp. 2841-2850
Author(s):  
Didunoluwa Obilanade ◽  
Christo Dordlofva ◽  
Peter Törlind
Keyword(s):  
Surface Roughness ◽  
Additive Manufacturing ◽  
Literature Review ◽  
Future Research ◽  
Reduction Potentials ◽  
Research Fields ◽  
Post Process ◽  
Accessibility Issues ◽  
End Use ◽  
And Performance

AbstractOne often-cited benefit of using metal additive manufacturing (AM) is the possibility to design and produce complex geometries that suit the required function and performance of end-use parts. In this context, laser powder bed fusion (LPBF) is one suitable AM process. Due to accessibility issues and cost-reduction potentials, such ‘complex’ LPBF parts should utilise net-shape manufacturing with minimal use of post-process machining. The inherent surface roughness of LPBF could, however, impede part performance, especially from a structural perspective and in particular regarding fatigue. Engineers must therefore understand the influence of surface roughness on part performance and how to consider it during design. This paper presents a systematic literature review of research related to LPBF surface roughness. In general, research focuses on the relationship between surface roughness and LPBF build parameters, material properties, or post-processing. Research on design support on how to consider surface roughness during design for AM is however scarce. Future research on such supports is therefore important given the effects of surface roughness highlighted in other research fields.

All-inorganic perovskite quantum dots-based electrospun polyacrylonitrile fiber for ultra-sensitive trace-recording

2021 ◽  
Author(s):  
Yanyan Li ◽  
Lifan Shen ◽  
E.Y.B. Pun ◽  
Hai Lin
Keyword(s):  
Quantum Dots ◽  
Laser Excitation ◽  
Green Emission ◽  
Polyacrylonitrile Fiber ◽  
Enhanced Fluorescence ◽  
Electrospinning Technique ◽  
Band Emission ◽  
Pan Fiber ◽  
Perovskite Quantum Dots ◽  
Biological Protection

Abstract All-inorganic dual-phase CsPbBr3-Cs4PbBr6 quantum dots (CPB QDs)-based polyacrylonitrile (PAN) fiber synthesized by supersaturated recrystallization and electrospinning technique possesses characteristics of homogeneous morphology, high crystallinity and solution sensitivity. Under 365 nm laser excitation, CPB@PAN fiber exhibits surprising trace-recording capability attributing to the splash-enhanced fluorescence (FL) performance with a narrow-band emission at 477-515 nm. In the process of ethanol-anhydrous (EA) and water splashing, the CPB@PAN fiber presents conspicuous blue and green emission when contacting with EA and water, and maintains intense blue and green FL for more than 4 months. These experimental and theoretical findings provide a facile technology for the development of biological protection display, biotic detection and moisture-proof forewarning based on the trace-recording performance of CPB@PAN fiber.

Evaluation of Substances Released from Hydrothermal Pretreated Municipal Sludge and Performance of Hydrogen Production by the Corresponding Supernatant

2013 ◽  
Vol 726-731 ◽  
pp. 2468-2475 ◽  
Author(s):  
Li Yu ◽  
Cheng Lin Sun ◽  
Yong Hui Yu ◽  
Wen Tian Jiang
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Yield ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Production Potential ◽  
Reaction Conditions ◽  
Stirring Rate ◽  
And Performance ◽  
Temperature Time ◽  
Central Composite

Response surface methodology (RSM) with central composite design was adopted to investigate the optimum condition for carbohydrate released from hydrothermal pretreated sludge in an autoclave used for WAO (wet air oxidation). Temperature, time and stirring rate were chosen as variables. The maximum carbohydrate release (1356.8 mg/L) was estimated at the temperature of 161.2 °C, the time of 48 min and the stirring rate of 661 r/min. This statistical method could precisely optimize reaction conditions and predict the experimental data. Only 11.2 mL methane was generated with little hydrogen production of raw sludge. In contrast, hydrogen production potential of 25 mL was reached by using supernatant as substrate with a COD removal of 78.14%. Hydrogen yield was increased from 0.13 mL/g-VS (raw sludge) to 13.16 mL/g-VS (supernatant of pretreated sludge).

Investigating the jet stretch in the wet spinning of PAN fiber

2007 ◽  
Vol 106 (4) ◽  
pp. 2267-2273 ◽  
Author(s):  
Xiaomei Zeng ◽  
Juan Hu ◽  
Jiongxin Zhao ◽  
Youwei Zhang ◽  
Ding Pan
Keyword(s):  
Wet Spinning ◽  
Pan Fiber

Investigation the jet stretch in PAN fiber dry-jet wet spinning for PAN-DMSO-H2O system

2009 ◽  
Vol 114 (6) ◽  
pp. 3621-3625 ◽  
Author(s):  
Xiaomei Zeng ◽  
Jiangmin Chen ◽  
Jiongxin Zhao ◽  
Chengxun Wu ◽  
Ding Pan ◽  
...  
Keyword(s):  
Wet Spinning ◽  
Pan Fiber

Synthesis of Wc-Co Nanocomposites Using Polymer as Carbon Source

1994 ◽  
Vol 346 ◽  
Author(s):  
A. Manthiram ◽  
Y. T. Zhu
Keyword(s):  
Critical Role ◽  
High Hardness ◽  
X Ray Diffraction ◽  
Novel Approach ◽  
Chemical Inertness ◽  
Synthesis And Processing ◽  
And Performance ◽  
Temperature Time ◽  
Resistance To Heat

ABSTRACTCeramic-metal composites such as WC-Co are attractive for cutting-tool applications as they have high hardness, chemical inertness and resistance to heat. The properties and performance of these composites can be enhanced by keeping the size of the components on a nanometer scale. Synthesis of WC-Co nanocomposites generally involves gas-phase carburization. We have developed a novel approach in which a polymer precursor such as polyacrylonitrile serves as an in situ source for carbon. The WC-Co nanocomposites formed are characterized by x-ray diffraction and electron microscopy. The synthesis and processing conditions such as firing temperature, time and atmosphere play a critical role in obtaining phase-pure products.

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