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.

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.

Structure and Properties of Soybean Milk Modified Polyacrylonitrile Fiber

2011 ◽  
Vol 204-210 ◽  
pp. 1295-1298 ◽  
Author(s):  
Zhao Jia ◽  
Yan Gong Yang
Keyword(s):  
Mechanical Properties ◽  
Soy Protein ◽  
Moisture Absorption ◽  
Polyacrylonitrile Fiber ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Soybean Milk ◽  
X Ray ◽  
Pan Fiber ◽  
Scanning Electron

After a series of chemical procedures of surface hydrolysis, acidchloride reaction and grafting, Polyacrylonitrile (PAN) fiber was grafted from soybean milk and the soy protein-modified PAN fiber was obtained. The structures and morphologies of the grafted fiber were characterized by Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and scanning electron microscope (SEM).The results show that the surface of PAN fiber was covered by soy protein overlay film. Moisture absorption and mechanical properties were investigated. The grafted PAN fiber presented better hygroscopicity and still meet the requirement for wearing.

Luminescent PAN Fibers Doped with Tb3+ by Electrospinning

2013 ◽  
Vol 278-280 ◽  
pp. 448-451
Author(s):  
Dong Mei Zhao ◽  
Yu Hong Du ◽  
Tao Jiang ◽  
Xu Duo Bai ◽  
Hong Zhao
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Composite Fibers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron ◽  
Pan Fibers ◽  
Spun Fibers

In this study, monodispersed Tb3+ ions were successfully dispersed in the polyacrylonitrile (PAN) solution. Tb3+/PAN composite fibers were fabricated by electrospinning the PAN solutions containing different amount of Tb3+ ions. Further investigation showed that Tb3+ ions were homogeneously dispersed in the fibers individually. The composite fibers showed a uniform and continuous morphology. The as-spun fibers were characterized by Field Emission Scanning Electron Microscope (FE-SEM) and X-ray diffraction (XRD)

Shape-Controlled Synthesis and Formation Mechanism of Cobalt Nanopowders by a PVP-Assisted Method

2010 ◽  
Vol 654-656 ◽  
pp. 1186-1189 ◽  
Author(s):  
Bing Cong Zhang ◽  
Hong Ying Yu ◽  
Dong Bai Sun
Keyword(s):  
Hydrazine Hydrate ◽  
Chemical Reduction ◽  
Reducing Agent ◽  
Soft Template ◽  
Basic Solution ◽  
X Ray Diffraction ◽  
Mechanism Of Formation ◽  
X Ray ◽  
Nucleation Sites ◽  
Shape Controlled

Three different kinds of morphologies including spherical, chainlike and wirelike cobalt nanopowders, have been synthesized by chemical reduction of coblat chloride solution with hydrazine hydrate in basic solution. The products were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). It was revealed that the morphologies of the nanopowders depend on the concentration of Co2+ and the way of adding reducing agent (hydrazine hydrate). These two features affected the nucleation sites and the number of nucleuses. When the concentration of Co2+ was low, nucleuses formed in the soft template, while the reducing of the reducing agent added drop wise, a little number of nucleuses was formed. Based on that, a mechanism of formation, as a basis of gram-scale syntheses, was proposed.

Effect of Processing Conditions on Properties of KMnO4-Treated PAN Fibers

2013 ◽  
Vol 821-822 ◽  
pp. 23-27
Author(s):  
Xiang Li ◽  
Chun Yi Liu ◽  
Ai Wen Qin ◽  
Xin Zhen Zhao ◽  
Chun Ju He
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Chemical Structure ◽  
Suitable Condition ◽  
Wide Angle ◽  
Processing Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron ◽  
Pan Fibers

Plasticized polyacrylonitrile(PAN) fibers have been chemically impregnated with aqueous solution of KMnO4under varying conditions of temperature and time. The effect of modification conditions on the chemical structure and the mechanical properties of precursor fibers are characterized by wide-angle X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscope. The experimental results show that KMnO4can be used not only as catalyst for cyclization reaction, but also as plasticizer. The chemical modification between KMnO4and PAN can not occur below70°C, the most suitable condition for modification is performed at 80°C for 5 min.

Analysis Performance of Protein Modified Cellulose Fiber

2013 ◽  
Vol 821-822 ◽  
pp. 139-143
Author(s):  
Li Yang ◽  
Song Mei Bi ◽  
Lei Zhou ◽  
Ying Feng Wang
Keyword(s):  
Moisture Absorption ◽  
Cellulose Fiber ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
Fiber Morphology ◽  
Absorption Properties ◽  
X Ray ◽  
Protein Fiber ◽  
Degree Of Orientation ◽  
Ft Ir

In order to compare differences between the structure and properties of pupa protein fiber and rousi fiber ,test morphology and molecular structure of fiber by using optical microscope, X ray diffraction, fourier transform infrared spectroscopy (FT-IR) . The results show that:the two kinds of fiber morphology consistent with the ordinary viscose, the pupa protein fiber crystallinity and degree of orientation are higher than the rousi fiber, and rousi fibers contain small amounts of metal elements, the pupa protein fiber mechanical properties, moisture absorption properties and heat resistance are superior to rousi fiber.

scholarly journals Impact of alumina particles on the morphology and mechanics of hybrid wood plastic composite materials

2019 ◽  
Vol 51 (1) ◽  
pp. 115-124 ◽  
Author(s):  
Srdjan Perisic ◽  
Marija Vuksanovic ◽  
Milos Petrovic ◽  
Andjela Radisavljevic ◽  
Aleksandar Grujic ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Moisture Absorption ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Pressing Method ◽  
X Ray ◽  
Plastic Composite ◽  
Alumina Particles ◽  
Gel Technique ◽  
The Impact

Hybrid composite panels of Wood-Plastic Composites (WPC) consisting of wood and poly (methyl methacrylate) (PMMA) were reinforced with alumina particles and made by ?hot pressing? method. Alumina-based particles were made by sol-gel technique. The particles were characterized by the X-ray diffraction (XRD). The resulting alumina particles were modified with (3mercaptopropyl) trimethoxysilane (MPTMS), in order to obtain better mechanical properties of the composite relative to the composite with unmodified alumina particles. The aim of this work was to study the influence of composite structure and the moisture absorption on bending and the impact properties of the hybrid composite. The bending and impact tests revealed that modulus of elasticity and absorbed energy of deformation increased with modification of alumina and slightly decrease after moisture absorption.

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.

scholarly journals Sustainable Functionalization of PAN to Improve Tinctorial Capacity

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3665
Author(s):  
Vasilica Popescu ◽  
Ingrid Ioana Buciscanu ◽  
Melinda Pruneanu ◽  
Stelian Sergiu Maier ◽  
Angela Danila ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Xrd Analysis ◽  
Hypervalent Iodine ◽  
X Ray Diffraction ◽  
X Ray ◽  
Yellow Orange ◽  
The Fourier Transform ◽  
Scanning Electron ◽  
Pan Fibers

This study may open a new way to obtain the coloration of a polymer during functionalization. Two polyacrylonitrile (PAN) polymers in the form of textile fibers (Melana and Dralon L) were subjected to functionalization treatments in order to improve the dyeing capacity. The functionalizations determined by an organo-hypervalent iodine reagent developed in situ led to fiber coloration without using dyes. KIO3 was formed in situ from the interaction of aqueous solutions of 3–9% KOH with 3–9% I2, at 120 °C. The yellow-orange coloration appeared as a result of the transformations in the chemical structure of each functionalized polymer, with the formation of iodinehydrin groups. The degree of functionalization directly influenced the obtained color. The results of the Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), Map and Temogravimetric Analysis (TG) plus Differential Thermal (DTA) analyses indicated the presence of new functional groups, such as iodine-oxime. The X-ray diffraction (XRD) analysis confirmed the change of the crystalline/amorphous ratio in favor of the former. The new groups introduced by functionalization make it possible to dye with classes of dyes specific to these groups, but not specific to PAN fibers, thus improving their dyeing capacity.

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