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.

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.

Structure and Properties of Hydrolyzed Cyclization-Crosslinking Flame-Retardant Polyacrylonitrile Fiber

2015 ◽  
Vol 1120-1121 ◽  
pp. 576-580 ◽  
Author(s):  
Yong Qiang Kang ◽  
Yan Gong Yang ◽  
Li Jing Li ◽  
Zhao Jia ◽  
Ai Rong Ma
Keyword(s):  
Flame Retardant ◽  
Moisture Absorption ◽  
Polyacrylonitrile Fiber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pan Fiber ◽  
Group Band ◽  
Pyridine Group ◽  
Modification Treatment ◽  
Pan Fibers

As flame-retardant Polyacrylonitrile (PAN) fibers was one of the most important differential fibers, it was of great importance to make research on the modification of flame-retardant PAN fibers to improve its characteristics. In this present study, the flame-retardant PAN fiber with good moisture absorption and mechanical properties has been prepared treated by blending solution of sodium hydroxide and hydrazine hydrate. FTIR spectra presented that new amide and cyclization-crosslinking pyridine group band peaks appeared. X-ray diffraction showed that the crystal structure of PAN fibers has been converted from quasi-crystalline structure into partially crystallized structure after modification treatment. SEM micrographs indicated that the original longitudinal surface microgroove has changed to layered structure by surficial etchant.

scholarly journals Study of PAN Fiber and Iron ore Adsorbents for Arsenic Removal

2020 ◽  
Vol 6 (3) ◽  
pp. 548-562 ◽  
Author(s):  
Zulfiqar Ali Bhatti ◽  
Khadija Qureshi ◽  
Ghulamullah Maitlo ◽  
Shoaib Ahmed
Keyword(s):  
Adsorption Capacity ◽  
Iron Ore ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Polyacrylonitrile Fiber ◽  
Pan Fiber ◽  
Chloride Hexahydrate ◽  
The Impact ◽  
Better Than ◽  
Pan Fibers

The main idea to conduct this study is the treatment of hazardous arsenite (As+3)  and arsenate (As+5)from water by two efficient adsorbetns i.e. polyacrylonitrile fiber (organic) and iron ore (inorganic). Polyacrylonitrile (PAN) fibers were chemically modified prior to loading iron using a solution of diethylenetriamine and aluminum chloride hexahydrate. The characterization of PAN fibers was performed through FTIR spectroscopy, which shows the binding of functional groups on PAN fibers surfaces. Atomic absorption spectrometer (AAS) was used to analyze arsenic concentration in samples. The impact of pH, dosage, shaking (contact) time and shaking speed was studied and parameters were optimized for further study. The highest adsorption of 98% is exhibited by modified PAN fiber for As+5 while for As+3 removal is 80%. Modified PAN also showed higher adsorption capacity of 42×103μg/g for As+5 which is better than the As+3 adsorption capacity 33×103 μg/g. Overall results demonstrated that MPAN adsorbent is better than the iron ore adsorbent for the treatment of both As+3 and As+5. Comparative studies of PAN Fiber and iron ore adsorbents revealed that PAN fibers had better adsorption properties than iron ore for As+3  and As+5 in terms of percentage removal and capacity.

Study on Structure and Properties of Polyacrylonitrile Fiber Modified by Hydrazine Hydrate

2012 ◽  
Vol 548 ◽  
pp. 24-28 ◽  
Author(s):  
Zhao Jia ◽  
Yan Gong Yang
Keyword(s):  
Hydrazine Hydrate ◽  
Moisture Absorption ◽  
Polyacrylonitrile Fiber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pan Fiber ◽  
Group Band ◽  
Modification Treatment ◽  
Pan Fibers ◽  
Quasicrystalline Structure

In this study, the flame-retardant PAN fiber with good moisture absorption, good mechanical properties and better thermal properties has been prepared by blending solution of sodium hydroxide and hydrazine hydrate. FTIR spectra presented that new amide and cyclization-crosslinked pyridine group band peaks appeared. X-ray diffraction showed that the the crystal structure of PAN fibers has been converted from quasicrystalline structure into partially crystallized structure after modification treatment. SEM micrographs indicated that the original longitudinal surface microgroove has changed to layered structure by surfical etchant.

Preparation and Swelling Properties of Organoclay/Super-Absorbent Resin Using Polyacrylonitrile Fiber Wastes

2015 ◽  
Vol 1120-1121 ◽  
pp. 635-638 ◽  
Author(s):  
Ru Feng Cen ◽  
Kun Yan Wang ◽  
Wen Wen Shu
Keyword(s):  
Alkaline Hydrolysis ◽  
Chemical Structure ◽  
Swelling Behavior ◽  
Polyacrylonitrile Fiber ◽  
Resin Composites ◽  
Swelling Properties ◽  
Construction Engineering ◽  
Potential Applications ◽  
Cross Linker ◽  
Pan Fibers

A series of novel organoclay(OMMT)/super-absorbent resin composites were prepared using the waste of PAN fibers at alkaline hydrolysis condition with Al2(SO4)3 as cross-linker. The effects of OMMT content on the chemical structure and degradation of the super-absorbent resin were investigated. The swelling behavior was also evaluated. The swelling rates of super-absorbent resin went up with increasing OMMT loading to 3wt% and then decreased with further increasing OMMT loadings. OMMT-based super-absorbent resin might have potential applications in many areas, such as construction engineering and hygienic products.

scholarly journals In Situ Synthesis of Silver Nanoparticles on Amino-Grafted Polyacrylonitrile Fiber and Its Antibacterial Activity

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Guangyu Zhang ◽  
Yao Xiao ◽  
Qitao Yin ◽  
Jiawei Yan ◽  
Chuanfeng Zang ◽  
...  
Keyword(s):  
Antibacterial Property ◽  
Average Diameter ◽  
Polyacrylonitrile Fiber ◽  
Amino Groups ◽  
Ag Nps ◽  
Uniform Coating ◽  
Pan Fiber ◽  
Amidation Reaction ◽  
Pan Fibers

AbstractIn this study, amino hyperbranched polymers (HBP)-grafted polyacrylonitrile (PAN) fiber was prepared through an amidation reaction in an autoclave. The prepared PAN-G-HBP fiber can complex Ag+ through amino groups of amino HBP, and in a hot steaming condition, Ag+ can be converted to Ag0 through the reducibility of HBP. PAN-G-HBP and Ag nanoparticles (NPs)-coated fibers were then characterized through FTIR, UV–VIS DRS, FE-SEM, EDS, XPS and antibacterial measurement. FTIR results confirmed HBP was grafted on the surface of PAN fiber. FE-SEM showed that after grafting with HBP, the average diameter of PAN fibers was amplified. EDS, XPS, and UV–VIS DRS method indicated that under hot steaming condition and with the reducibility of HBP, Ag NPs uniform coating on the PAN-G-HBP. Ag NPs-coated fibers exhibits excellent antibacterial property against Escherichia coli and Staphylococcus aureus. Even under 20 times home washing conditions, the antibacterial reduction of Ag NPs-coated PAN fiber can achieved more than 98.94%.

Preparation of Straw Superabsorbent Composite Material by Microwave Method

2013 ◽  
Vol 873 ◽  
pp. 337-343
Author(s):  
Lian Wei Yang ◽  
Rui Jie Wang
Keyword(s):  
Composite Material ◽  
Acrylic Acid ◽  
Water Retention ◽  
Salt Water ◽  
High Water ◽  
Sodium Acrylate ◽  
Microwave Method ◽  
Water Absorbency ◽  
Distilled Water ◽  
Preparation Conditions

By microwave method, a superabsorbent function composite material was prepared by grafting sodium acrylate onto straw flour using potassium persalfate (K2S2O8) and N, N'-methylene bis acrylamide as an initiator and crosslinker, respectively. The effect of various preparation conditions on its water absorbency was investigated. When the straw flour content was 6%, the acrylic acid content was 20.0g, the amount of initiator was 0.4%, the neutralization degree of monomer was 80%, the reaction temperature was 70°C and the amount of crosslinker was 0.05%, the materials absorbency was 1360 times in distilled water and 152 times in 0.9% salt-water at ambient temperature. It had also high water retention. The analyses of SEM indicate that sodium acrylate is grafted on the polysaccharides of straw flour.

scholarly journals DIELECTRIC MONITORING OF THE PAN FIBER STABILIZATION PROCESS

2019 ◽  
Author(s):  
Julia Hofele ◽  
Guido Link ◽  
John Jelonnek
Keyword(s):  
Dielectric Properties ◽  
Chemical Reaction ◽  
Dielectric Constants ◽  
Conventional Heating ◽  
Polyacrylonitrile Fiber ◽  
Carbon Fiber Composites ◽  
Stabilization Process ◽  
Pan Fiber ◽  
Hot Air ◽  
Pan Fibers

Carbon fiber composites are key components of future lightweight applications. But, due to the energy intensive production of carbon fibers, the final material costs are not competitive if compared to steel or aluminum even though the mechanical properties are superior [1]. Hence, a new approach is necessary. Microwave heating might be the solution [2]. For the successful design of an appropriate system, the knowledge of the temperature-dependent dielectric properties of the raw material together with the chemical process during the production is mandatory. The production process starts from the Polyacrylonitrile fiber (PAN fiber) and consists of two major stages: the initial stabilization and the final carbonization. The most significant energy saving is expected at the stabilization stage [3]. The dielectric properties of conventionally stabilized PAN fibers and virgin PAN fibers were measured at room temperature in a TM010-mode cylindrical cavity using the cavity perturbation method. The measured differences in the dielectric constants and the material densities of both fibers (see Table 1) leads to the assumption that the change in the dielectric properties can be followed during the stabilization process and allows controlling the chemical reaction. Currently a system is set up that enables the in-situ recording of the chemical reaction during the stabilization process by using conventional heating. Figure 1 shows the schematic of the setup. The PAN fibers are located in a quartz tube. The conventional heating bases on the controlled flow of hot air. Thermocouples measure the temperatures at the entry and the exit points of the hot air. It is expected that the data acquired from the measurements will provide useful information about the reaction kinetics, which is important for the design of a microwave assisted stabilization process.

scholarly journals Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers

2020 ◽  
Vol 9 (1) ◽  
pp. 139-152 ◽  
Author(s):  
Xiao Zhang ◽  
Yanlu Liu ◽  
Panfang Lu ◽  
Min Zhang
Keyword(s):  
Slow Release ◽  
Environmentally Friendly ◽  
Water Absorbency ◽  
The Novel ◽  
Structure And Properties ◽  
Nitrogen Release ◽  
Release Property ◽  
Slow Release Fertilizers ◽  
Grafting Copolymerization ◽  
Cross Linker

AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural 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.

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