Preparation and characterization of polyacrylonitrile for carbon fiber manufacture by photo-induced polymerization
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Polyacrylonitrile
Characterization
SO42-/ Ti O2 catalyst was firstly immobilized in preoxidated polyacrylonitrile by electrospinning and preoxidation. This novel catalyst was characterized by SEM,SEM-EDS,FT-IR and XRD. The results showed that the fiber structure was well kept after preoxidation and the Ti element was dispersed homogeneously in the fiber. Moreover,the polyacrylonitrile linear structure was changed into conjugate structure after preoxidation process. The catalytic performance of this fiber catalyst was evaluated by the acetalization reactions. The results showed that the fiber catalyst was very efficient for the acetalization reaction with high yields( 87%). Moreover,the catalyst can be easily recovered and reused for five times without obvious loss of initial activity. The high activity and stability made the fiber solid acid hold great potential for the green chemical processes.
Polyacrylonitrile
Electrospinning
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The basic process and effect of modification of polyacrylonitrile(PAN) fiber by protein surface grafting was studied in this paper. With simple procedures of surface hydrolysis, acidchloride reaction and grafting, the soybean protein could be grafted onto the PAN fiber which endowed the fiber with protein surface, and protein-modified PAN fiber was obtained. SEM photographs showed that after the protein has been grafted, the cracks and pores of the surface of the PAN fiber were filled with protein which gave the fiber new surface and structure. Thus the surface property of PAN fiber changed and the protein-modified function was obtained.
Polyacrylonitrile
Surface Modification
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Abstract The theory that β‐ketonitrile structures initiate discoloration reactions in polyacrylonitrile has been tested by a number of methods. Using radiochemical techniques the numbers of carbonyl groups in various polymers have been measured as have the amounts of combined water. A model β‐keto compound, 1,3,7,‐tricyanoheptan‐4‐one was synthesized and its reactions studied. None of these experiments supported the idea that β‐ketonitrile structures are of primary importance in initiating the degradation of polyacrylonitrile.
Polyacrylonitrile
Degradation
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The structure of polyacrylonitrile copolymer was characteriszed by IR spectrometry.The experimental results showed that the polyacrylonitrile copolymers was terpolymer,except for part samples containing DMF menstruum,polyacrylonitrile copolymers of sith filature in different factories agreed with the polyacrylonitrile copolymers of before filature in the structure.The method provides the reference and scientific foundation for reasonable chose of filature method and producing textiles that are beneficial to human health.
Polyacrylonitrile
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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.
Polyacrylonitrile
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A new method of the preparation of carrier of enzyme immobilization magnetic polyacrylonitrile microsphere was reported in this paper. Dispersed the nanometer magnetic fluid into the N,N dimethylformamide solution of polyacrylonitrile, the suparamagnetic polyacrylonitrile microsphere was obtained by using spray method. The influence factor on the particle properties were investigated in detail. Under the optimum conditions: C PAN =1g/L, T =180℃, n =30 000r/min, V =2mL/s, C magnetic fluid =2g/L, suparamagnetic polyacrylonitrile microspheres with narrow disperse(1.0μm～1.5μm) were prepared.
Polyacrylonitrile
Dimethyl formamide
Nanometre
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With polyacrylonitrile fiber and collagen as the basic raw material,collagen modified polyacrylonitrile fibers with a high moisture regain and durability were prepared by hydrolysis-baking method.The structures and properties of collagen modified polyacrylonitrile fiber were analyzed by means of FT-IR,TG,XRD,DMA,SEM techniques.Results show that: compared with unmodified fiber,the surface of modified fiber is smooth and covered by a large number of collagen composition,the moisture regain increased from 2% to 6.1%,thermal decomposition temperature decreased from 318℃ to 296℃.The breaking strength and elongation of collagen modified polyacrylonitrile fiber are decreased too.
Polyacrylonitrile
Electrospinning
Breaking strength
Elongation
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Polyacrylonitrile
Electrospinning
Solid acid
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Polyacrylonitrile
Carbon fibers
Synthetic fiber
Small-angle X-ray scattering
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: The preparing and structure of polyacrylonitrile-based activated carbon hollow fiber ( PAN-Based ACHF) ,the effect of preparing conditions on PAN-Based ACHF and feasibility of PAN-Based ACHF as adsorbent medically are briefly introducted.
Polyacrylonitrile
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