Investigation on polymeric fibers as reinforcement in cementitious composites: Flexural performance
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The objective of this article is to evaluate the effect of some synthetic polymeric fibers on the flexural behavior of cement-based matrix. On this basis, polypropylene (PP), nylon 6,6 (N66), and polyacrylonitrile (PAN) fibers were selected and characterized by optical microscopy, tensile test, aging in chemical solution, surface free energy testing, and scanning electron microscopy. The flexural behavior of fiber-reinforced cementitious composites was determined using a three-point bending test. N66 and PAN fiber reinforced composites had higher toughness and maximum flexural strength, which were in line with the results of surface free energy of the fibers.Keywords:
Polyacrylonitrile
Polypropylene
Synthetic fiber
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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Abstract not Available.
Polyacrylonitrile
Carbon fibers
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Volume fraction
Ductility (Earth science)
Synthetic fiber
Fiber Reinforced Concrete
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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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Cotton fibers are constructed principally of macromolecules of cellulose. These are disposed in the fiber in such a way as to display a number of aspects, which collectively may be referred to as the "supermolecular structure." It includes such features as molecular chain length, polymolecularity, natural cross-linkage, crystallinity, crystal modification, crystallite size, orientation. accessibility, and chemical modification. Super imposed on these structural aspects is the gross morphology of the fiber itself. Many of these aspects have an influence in one way or another upon the response which the fiber makes when subjected to a variety of mechanical forces, which collectively may be referred to as "mechanical behavior." Among the responses considered are strength, elongation, stiffness, toughness, elasticity, and resilience. Selected examples are pre sented, showing how the mechanical behavior is conditioned in various ways by the supermolecular structure.
Synthetic fiber
Elongation
Mechanical strength
Elasticity
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Spider Silk
Aramid
Synthetic fiber
Kevlar
Tear resistance
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Polyacrylonitrile
Carbon fibers
Synthetic fiber
Small-angle X-ray scattering
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The ability of fibre reinforced concrete composites to absorb energy has long been recognised as one of the most important benefits of the incorporation of fibres into plain concrete” (Golpalaratham and Gettu 1995). Steel and synthetic fibres have been used in concrete floor slabs with success in providing crack control. Slab design using synthetic fibres relies heavily upon manufacturers design guidance whereas steel fibres have better developed independent design guides available to assist their correct use (The Concrete Society 2007a). This paper examines the pull out values of both steel and Type 2 synthetic fibres embedded in concrete and equates their dosage when used in beams to provide near equal toughness values, thus providing the designer with a synthetic/steel fibre ratio by mass of fibre addition for equal performance. According to Nataraja, et al (2000), the most common method to measure toughness, is to use the load-deflection curve. One of the most widely used load-deflection tests has been ASTM 1018, which was used herein to evaluate the post crack toughness; by stating toughness as independent indices and residual strengths based upon the deflection at the formation of the first crack in the beam in relation to fixed points of further deflections under load. The ASTM test was chosen as it has been widely used and it is readily understood by many readers. The research demonstrates that near equal post crack toughness can be achieved in concrete beams using steel and synthetic fibres, at different doses.
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Slab
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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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