The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
S. K. N. Kutty - One of the best experts on this subject based on the ideXlab platform.
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enhanced electrical conductivity of polypyrrole polypyrrole coated short Nylon Fiber natural rubber composites prepared by in situ polymerization in latex
Materials & Design, 2013Co-Authors: D Pramila S Devi, P.k. Bipinbal, T Jabin, S. K. N. KuttyAbstract:Abstract In this paper we report the characterization and properties of conductive elastomeric composites of polypyrrole (PPy) and PPy coated short Nylon-6 Fiber (F-PPy) based on natural rubber (NR) prepared by in situ polymerization method. PPy/NR blends were prepared by polymerizing pyrrole in NR latex using anhydrous ferric chloride as oxidizing agent, p -toluene sulphonic acid as dopant and vulcastab VL as stabilizer. PPy/F-PPy/NR composites were prepared as above in presence of short Nylon Fiber. The products were coagulated out, dried, compounded on a two roll mill and moulded. The cure pattern, DC electrical conductivity, morphology, mechanical properties, thermal degradation parameters and microwave characteristics of the resulting composites were studied. Incorporation of PPy to elastomer retards the cure reaction whereas addition of Fiber accelerates the cure reaction. DC conductivity up to 6.25 × 10 −2 was attained for NR/PPy/F-PPy system. The composites containing F-PPy exhibited better mechanical properties compared to NR/PPy systems. The absolute value of the dielectric permittivity, AC conductivity and absorption coefficient of the conducting composites prepared were found to be much greater than the gum vulcanizate. PPy and F-PPy were found to decrease the dielectric heating coefficient and skin depth significantly.
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Synthesis and Characterization of Conducting Composites of Polypyrrole/Polypyrrole-Coated Short Nylon Fiber and Natural Rubber
Polymer-Plastics Technology and Engineering, 2012Co-Authors: D. S. Pramila Devi, Jabin Thekkedath, S. K. N. KuttyAbstract:Pyrrole was polymerized in the presence of anhydrous ferric chloride as oxidant and p-toluene sulphonic acid as dopant. Polypyrrole-coated short Nylon Fibers were prepared by polymerizing pyrrole in the presence of short Nylon Fibers. The resultant polypyrrole (PPy) and polypyrrole-coated Nylon Fiber (F-PPy) were characterized using SEM and then used to prepare rubber composites based on natural rubber. The cure pattern, cure kinetics, filler dispersion, DC conductivity, mechanical properties and morphology of the resulting composites were studied. The presence of PPy-coated Fibers in the natural rubber/PPy system reduced the cure time significantly. The DC conductivity of the composites was found to be better for the F-PPy system compared to PPy-filled NR composite. The F-PPy system also showed better tensile strength, modulus and tear resistance.
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A comparative study of short Nylon Fiber—Natural rubber composites prepared from dry rubber and latex masterbatch
Journal of Applied Polymer Science, 2008Co-Authors: P.k. Bipinbal, S. K. N. KuttyAbstract:A novel method for the preparation of short Nylon Fiber–natural rubber composites was developed in which short Fibers chopped to approximately 6 mm were incorporated in the latex stage and processed into sheet form. By this method, mixing cycle time was reduced without compromising the Fiber dispersion. Fiber breakage during mixing was reduced. The new composites when compounded with a dry bonding system based on hexamethylenetetramine, resorcinol and hydrated silica (HRH) showed improved modulus, tensile strength and abrasion resistance compared to conventional composites. Tear strength, resilience, and compression set were similar to the conventional composites. SEM analysis indicated better interaction between matrix and Fibers in the case of latex master batch. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
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Cure Characteristics and Mechanical Properties of Short Nylon Fiber Reinforced Natural Rubber–Reclaimed Rubber Blends
Polymer-Plastics Technology and Engineering, 2003Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:Cure characteristics and mechanical properties of short Nylon Fiber reinforced natural rubber–reclaimed rubber blend was studied. Minimum torque, maximum–minimum torque and cure rate were increased by the addition of Fiber. Tensile and tear properties were enhanced by the addition of Fibers. Introduction of Fibers decreased the resilience and abrasion loss. Heat build up and compression set were higher for the composites.
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Styrene butadiene rubber-short Nylon Fiber composites
International Journal of Polymeric Materials, 2003Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:The cure characteristics and mechanical properties of short Nylon Fiber reinforced styrene butadiene rubber were studied at varying Fiber concentration. The plasticity of the composite was adversely affected by Nylon short Fibers. The minimum torque increased with Fiber concentration. Scorch time and cure time showed a reduction in presence of short Fibers. The tensile strength, tear strength, elongation at break and abrasion resistance were studied in both the orientation of Fibers. Tensile strength, tear strength and abrasion resistance increased with Fiber concentration and were higher in the longitudinal direction. Resilience showed a reduction with Fiber content and compression set increased with Fiber loading.
T. D. Sreeja - One of the best experts on this subject based on the ideXlab platform.
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Cure Characteristics and Mechanical Properties of Short Nylon Fiber Reinforced Natural Rubber–Reclaimed Rubber Blends
Polymer-Plastics Technology and Engineering, 2003Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:Cure characteristics and mechanical properties of short Nylon Fiber reinforced natural rubber–reclaimed rubber blend was studied. Minimum torque, maximum–minimum torque and cure rate were increased by the addition of Fiber. Tensile and tear properties were enhanced by the addition of Fibers. Introduction of Fibers decreased the resilience and abrasion loss. Heat build up and compression set were higher for the composites.
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Styrene butadiene rubber-short Nylon Fiber composites
International Journal of Polymeric Materials, 2003Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:The cure characteristics and mechanical properties of short Nylon Fiber reinforced styrene butadiene rubber were studied at varying Fiber concentration. The plasticity of the composite was adversely affected by Nylon short Fibers. The minimum torque increased with Fiber concentration. Scorch time and cure time showed a reduction in presence of short Fibers. The tensile strength, tear strength, elongation at break and abrasion resistance were studied in both the orientation of Fibers. Tensile strength, tear strength and abrasion resistance increased with Fiber concentration and were higher in the longitudinal direction. Resilience showed a reduction with Fiber content and compression set increased with Fiber loading.
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Effect of Urethane Based Bonding Agent on the Cure Characteristics and Mechanical Properties of Styrene Butadiene Rubber – Whole Tyre Reclaim - Short Nylon Fiber Composite
Progress in Rubber Plastics and Recycling Technology, 2002Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:The cure characteristics and mechanical properties of short Nylon Fiber - styrene butadiene rubber/whole tyre reclaim (SBR/WTR) composites with and without an interfacial bonding agent based on 4,4 diphenyl methane diisocyanate and polyethylene glycol (MDI/PEG) have been studied. An 80:40 blend of SBR/ WTR reinforced with 20 phr of short Nylon Fiber has been selected and the MDI/ PEG ratio has been changed from 0.67:1 to 2:1. The minimum and maximum torques increased with isocyanate concentration. The scorch time and cure time showed an initial reduction. The cure rate showed an initial improvement. Tensile strength, tear strength and abrasion resistance increased with MDI/PEG ratio, these values were higher in longitudinal direction. Resilience and compression set increased with isocyanate concentration.
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Studies on Acrylonitrile Butadiene Rubber - Short Nylon Fiber Composites
Journal of Elastomers & Plastics, 2002Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:Acrylonitrile butadiene rubber (NBR) matrix was reinforced with different levels of short Nylon Fiber loading. Cure characteristics and mechanical properties of composites in longitudinal and transverse directions have been studied. Cure time was reduced while process ability, as indicated by the minimum torque, was marginally reduced with increase in Fiber loading. Tensile and tear properties improved with Fiber concentration and the values were higher in longitudinal direction of Fiber orientation. Abrasion resistance, resilience and compression set were increased in presence of Fibers. Elongation at break values showed a drastic drop on introduction of Fibers. Heat build up was higher for composites.
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Acrylonitrile–butadiene rubber/reclaimed rubber—Nylon Fiber composite
Advances in Polymer Technology, 2001Co-Authors: T. D. Sreeja, S. K. N. KuttyAbstract:The effect of diphenylmethane diisocyanate (MDI)–polyethyleneglycol (PEG) resin on the cure characteristics and mechanical properties of nitrile rubber/whole tyre reclaim—short Nylon Fiber composite—was studied. At a constant loading of 5 phr, the resin composition was varied. The minimum torque and (maximum − minimum) torque increased with isocyanate concentration. Scorch time and cure time showed a reduction on introduction of bonding agent. Properties like tensile strength, tear strength, and abrasion resistance increased with increase in MDI/PEG ratio, and these properties are higher in the longitudinal direction of Fiber orientation. Compression set increased with isocyanate concentration and the resilience remain unchanged. © 2001 John Wiley & Sons, Inc. Adv Polym Techn 20: 281–288, 2001
Dengjia Huang - One of the best experts on this subject based on the ideXlab platform.
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Linear rheology of natural rubber compounds filled with silica, short Nylon Fiber or both
Polymer, 2018Co-Authors: Yihu Song, Dengjia HuangAbstract:Abstract Engineered rubbery materials in practical applications usually contain nanoparticle and microscopic short Fiber while no theories could describe the viscoelasticity of the compounds varying with these two kinds of fillers. We describe how the linear rheology of natural rubber compounds varies with the loading of precipitated silica, short Nylon Fiber, or both. We for the first time disclose a filler dimension-dependent hydrodynamic-to-non-hydrodynamic transition by applying the time-concentration superposition principle for accounting for the apparent liquid-to-solid transition related to filler composition and loading and the retarded dynamics of the matrix. A framework for simultaneous solving the reinforcement and dissipation of the multi-component compounds is suggested, providing a new perspective on understanding the filling effect for manufacturing high-performance rubber materials.
Hiroshi Yokota - One of the best experts on this subject based on the ideXlab platform.
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Effectiveness of recycled Nylon Fiber from waste fishing net with respect to Fiber reinforced mortar
Construction and Building Materials, 2017Co-Authors: Shanya Orasutthikul, Daiki Unno, Hiroshi YokotaAbstract:This paper discusses the utilization of recycle waste fishing nets in Fiber reinforced mortar. Experimental test results compared the mechanical properties of such mortar made with recycled Nylon Fiber to those of such mortar made with recycled PET and PVA (polyvinyl alcohol) short Fibers. The recycled Nylon (R-Nylon) Fibers were obtained by manually cutting of waste fishing nets to the lengths of 20 mm, 30 mm and 40 mm. Two types of R-Nylon Fibers were investigated that are straight and knotted types. The addition of straight R-Nylon Fiber improved the flexural strength up to 41% in comparison with that of the knotted R-Nylon, recycled PET, and PVA Fibers. The compressive strength of the mortar with R-Nylon Fiber decreased with increase in Fiber fraction and length. The post peak load, toughness and residual strength depended on the properties of Fiber such as Young's modulus, tensile strength, and geometry as well as the bond strength between Fiber and matrix.
Yihu Song - One of the best experts on this subject based on the ideXlab platform.
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Linear rheology of natural rubber compounds filled with silica, short Nylon Fiber or both
Polymer, 2018Co-Authors: Yihu Song, Dengjia HuangAbstract:Abstract Engineered rubbery materials in practical applications usually contain nanoparticle and microscopic short Fiber while no theories could describe the viscoelasticity of the compounds varying with these two kinds of fillers. We describe how the linear rheology of natural rubber compounds varies with the loading of precipitated silica, short Nylon Fiber, or both. We for the first time disclose a filler dimension-dependent hydrodynamic-to-non-hydrodynamic transition by applying the time-concentration superposition principle for accounting for the apparent liquid-to-solid transition related to filler composition and loading and the retarded dynamics of the matrix. A framework for simultaneous solving the reinforcement and dissipation of the multi-component compounds is suggested, providing a new perspective on understanding the filling effect for manufacturing high-performance rubber materials.