Author
Baby Kuriakose
Bio: Baby Kuriakose is an academic researcher from Mahatma Gandhi University. The author has contributed to research in topics: Natural rubber & Vulcanization. The author has an hindex of 15, co-authored 33 publications receiving 834 citations.
Papers
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TL;DR: In this article, the authors studied the stress relaxation behavior of chemically treated short sisal fiber-reinforced natural rubber composite and found that the relaxation process was influenced by the bonding agent.
Abstract: Stress relaxation behavior of chemically treated short sisal fiber-reinforced natural rubber composite was studied. The effect of bonding agent, strain level, fiber loading, fiber orientation, and temperature has been studied in detail. The existence of a single relaxation pattern in the unfilled stock and a two-stage relaxation mechanism for the fiber-filled composite is reported. The relaxation process is influenced by the bonding agent, which indicated that the process involved fiber-rubber interface. The rate of stress relaxation increased with fiber loading, whereas it decreased with aging. © 1994 John Wiley & Sons, Inc.
114 citations
TL;DR: In this article, the ageing characteristics of natural rubber-aluminium powder composites were studied and it was found that these composites have better resistance towards heat, ozone, and gamma irradiation.
88 citations
TL;DR: In this paper, the effect of a two-component dry bonding system consisting of resorcinol and hexamethylene tetramine on the mechanical and viscoelastic properties of short sisal fiber reinforced natural rubber composites has been studied.
Abstract: The effect of a two-component dry bonding system consisting of resorcinol and hexamethylene tetramine on the mechanical and viscoelastic properties of short sisal fiber reinforced natural rubber composites has been studied. The studies were conducted with chemically treated and untreated short sisal fibers. Treated fibers impart better mechanical properties to the composites. By mixing with short fibers, the dynamic storage modulus (E') of natural rubber composites was improved. The effects of fiber-matrix adhesion on the mechanical and viscoelastic properties of the composites were investigated. The storage moduli and mechanical loss increased continuously with an increase in fiber loading but decreased with an increase of temperature. The influence of the fiber orientation on the mechanical and viscoelastic properties is discussed.
77 citations
TL;DR: In this article, the authors compared the mixing energy curves of blends containing NR of different molecular weight (Mn) and two grades of PP (injection and film grades) and found that a number average molecular weight in the range 4 × 105 for NR increased the procoessability without significantly affecting the technological properties of NR/PP thermoplastic blends.
Abstract: Thermoplastic elastomers, prepared by melt blending of natural rubber (NR) and isotactic polypropylene (PP) through a dynamic vulcanization technique, were developed during the later 1970s. However, they have certain drawbacks due to thermal degradation and higher molecular weight of NR. In the study reported here, NR was masticated to different levels prior its addition to isotactic polypropylene to improve the flow properties and to reduce the incompatibility resulting from molecular weight mismatch of NR/PP thermoplastic blends. Mixing energy curves of uncrosslinked blends and those of dynamically vulcanized blends crosslinked using different cure systems were compared. The mixing energy curves of blends containing NR of different molecular weight (Mn) and two grades of PP (injection and film grades) were also compared. Technological and processing properties of the dynamically vulcanized (sulphur and peroxide cure systems) and unvulcanized blends were compared with those of the samples containing unmasticated NR. The results indicated that a number average molecular weight in the range 4 × 105 for NR increased the procoessability without significantly affecting the technological properties of NR/PP thermoplastic blends. Among the three cure systems studied Luperox 101 and dicumyl peroxide gave better technological properties than the sulphur-cured samples. Two antioxidants, viz. quinoline (TDQ) and imidazole (MBI) type, were tried in NR/PP blends. It was found that TDQ imparts better aging resistance compared to MBI. The improvement in processability due to the reduction in molecular weight of natural rubber by mastication is more noticeable in the case of peroxide vulcanized blends compared to sulphur vulcanized samples. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2063–2068, 2004
61 citations
TL;DR: In this paper, a series of blends of natural rubber (NR) and ethylene-vinyl acetate copolymer (EVA) in the crosslinked and uncrosslinked states were used for differential scanning calorimetry, X-ray, dynamic mechanical and microscopy studies.
53 citations
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TL;DR: In this article, a survey about physical and chemical treatment methods which improve the fiber matrix adhesion, their results and effects on the physical properties of composites is presented, and the influence of such treatments by taking into account fibre content on the creep, quasi-static, cyclic dynamic and impact behaviour of natural fibre reinforced plastics are discussed in detail.
4,160 citations
TL;DR: A review of natural fiber reinforced composites is presented in this paper with special reference to the type of fibers, matrix polymers, treatment of fibers and fiber-matrix interface.
Abstract: Natural fiber reinforced composites is an emerging area in polymer science. These natural fibers are low cost fibers with low density and high specific properties. These are biodegradable and non-abrasive. The natural fiber composites offer specific properties comparable to those of conventional fiber composites. However, in development of these composites, the incompatibility of the fibers and poor resistance to moisture often reduce the potential of natural fibers and these draw backs become critical issue. This review presents the reported work on natural fiber reinforced composites with special reference to the type of fibers, matrix polymers, treatment of fibers and fiber-matrix interface. © 1999 John Wiley & Sons, Inc. Adv in Polymer Techn 18: 351–363, 1999
2,210 citations
TL;DR: A review of the literature on the various aspects of cellulosic fibres and biocomposites can be found in this paper, where the pros and cons of using these fibres are enumerated in this review.
1,908 citations
TL;DR: Sisal fiber is a promising reinforcement for use in composites on account of its low cost, low density, high specific strength and modulus, no health risk, easy availability in some countries and renewability as discussed by the authors.
1,041 citations
TL;DR: In this paper, the effect of fiber loading, frequency and temperature on the dynamic mechanical properties of a composite was analyzed with the consideration of the intrinsic properties of the components, morphology of the system and the nature of interface between the phases.
819 citations