Dynamic mechanical behavior of short coir fiber reinforced natural rubber composites

Abstract Dynamic mechanical behavior of natural rubber and its composites reinforced with short coir fibers has been studied. Maxima in tan δ, E″ and the middle point of E′ vs. temperature curves of the gum natural rubber compound at different frequencies almost coincide with one another. But the maxima in tan δ and E″ do not coincide in the case of composites. It is observed that as frequency increases the values of tan δ and E″ decrease whereas the values of E′ increase in the case of both gum and the composites. The values of E″ and tan δ increase with fiber incorporation, which indicates lower heat dissipation in the gum. Two prominent peaks are observed in the tan δ vs. temperature curve of these composites due to the dynamic mechanical behavior of matrix and fiber. The additional small peak represents the dynamic mechanical behavior at the interface. The effect of chemical treatment of coir fiber on damping of composites was studied and it was found that composite with poor interfacial bonding tend to dissipate more energy than that with good interfacial bonding.

[1]  R. Seymour.  Additives for plastics , 1978 .

[2]  I. K. Varma,et al.  Thermal behaviour of coir fibres , 1986 .

[3]  J. Cavaillé,et al.  Plasticized PVC reinforced with cellulose whiskers. I. Linear viscoelastic behavior analyzed through the quasi-point defect theory , 1999 .

[4]  Katsutoshi Tanaka,et al.  Dynamic mechanical properties of multi-functional epoxy resin cured with diamine and filled with pitch-based carbon short fibers treated with coupling agents , 1995 .

[5]  K. T. Mathew,et al.  Composite of short coir fibres and natural rubber : effect of chemical modification, loading and orientation of fibre , 1998 .

[6]  Sabu Thomas,et al.  Melt Flow Behavior of Short Coir Fiber Reinforced Natural Rubber Composites , 1996 .

[7]  V. G. Geethamma,et al.  Short coir fiber‐reinforced natural rubber composites: Effects of fiber length, orientation, and alkali treatment , 1995 .

[8]  M. Akay.  Aspects of dynamic mechanical analysis in polymeric composites , 1993 .

[9]  Sabu Thomas,et al.  Mechanical and viscoelastic properties of short fiber reinforced natural rubber composites: effects of interfacial adhesion, fiber loading, and orientation , 1994 .

[10]  A. R. Payne,et al.  Elastomers : criteria for engineering design , 1979 .

[11]  M. Misra,et al.  Scanning electron microscopy study of chemically modified coir fibers , 2001 .

[12]  B. R. Gupta,et al.  Effect of Mixing Time on Filler-Matrix Interactions in Polyacrylic Acid, Epoxidised Natural Rubber and Carbon Black Composites , 1997 .

[13]  S. Das,et al.  Study of jute fiber reinforced polyester composites by dynamic mechanical analysis , 1999 .

[14]  J. Otaigbe.  DYNAMIC MECHANICAL RESPONSE OF A THERMOPLASTIC SHEET MOLDING COMPOUND-GLASS FIBER COMPOSITE , 1991 .

[15]  G. Derringer.  Short Fiber-Elastomer Composites , 1971 .

[16]  M. Ashida,et al.  Dynamic viscoelasticities for short fiber‐thermoplastic elastomer composites , 1993 .

[17]  A. Bhowmick,et al.  Melt-processable rubber: Chlorinated waste tire rubber-filled polyvinyl chloride , 2002 .

[18]  T. Murayama,et al.  Dynamic mechanical analysis of polymeric material , 1978 .

[19]  Sabu Thomas,et al.  Effects of environment on the properties of low-density polyethylene composites reinforced with pineapple-leaf fibre , 1998 .

[20]  J. Sarasua,et al.  Dynamic Mechanical Behavior and Interphase Adhesion of Thermoplastic (PEEK, PES) Short Fiber Composites , 1998 .

[21]  R. Gauvin,et al.  Application of dynamic mechanical analysis for the study of the interfacial region in carbon fiber/epoxy composite materials , 1993 .

[22]  L. Ibarra.  The effect of a diazide as adhesion agent on composite materials consisting of an elastomeric matrix and short polyester fiber , 1993 .

[23]  M. Misra,et al.  Novel eco-friendly biodegradable coir-polyester amide biocomposites: Fabrication and properties evaluation , 2001 .

[24]  R. Landel,et al.  Mechanical Properties of Polymers and Composites , 1993 .