Short Fiber Reinforced Elastomers

Goettler, Lloyd A.; Shen, Ke

doi:10.5254/1.3538144

Cited by 101 publications

(52 citation statements)

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“…3,4 Generally, the degree of reinforcement depends upon the nature of the matrix, the type of fibers, the concentration and orientation of the fibers, fiber to rubber adhesion (generation of a strong interface), fiber length and aspect ratio of the fibers. 3,4,5 Poor adhesion increases the critical fiber length, which is the minimum length of fibers needed for effective stress transfer, since mechanical friction at the interface must take the role of adhesion. Good adhesion can nearly double the tensile strength and elongation at break compared to a composite in which the adhesion is poor.…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing Reinforcement of Nr and Epdm Rubbers With Short Aramid Fibers

Shirazi

Noordermeer

2011

Rubber Chemistry and Technology

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Among short fiber reinforced composites, those with rubbery matrices have gained great importance due to the advantages they have in processing and low cost, coupled with high strength. These composites combine the elastic behavior of rubbers with strength and stiffness of fibers. Reinforcement with short fibers offers additional features such as design flexibility, high modulus, tear strength, etc. The degree of reinforcement depends on parameters such as: the nature of the rubber matrix, the type of fibers, the concentration and orientation of fibers, fiber to rubber adhesion (generation of a strong interface), fiber length and aspect ratio of the fibers.In this research aramid fibers have been chosen because of their significantly higher modulus and strength, compared to other commercial fibers. Compounds based on NR and EPDM are prepared. Short aramid fibers with different kinds of surface treatments, standard finish and RFL-coating result in different rubber-fiber interfaces. The reinforcing effect of these short aramid fibers is characterized by mechanical and viscoelastic experiments, and by studying the fracture surfaces with microscopic techniques.

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Section: Introductionmentioning

confidence: 99%

Factors Influencing Reinforcement of Nr and Epdm Rubbers With Short Aramid Fibers

Shirazi

Noordermeer

2011

Rubber Chemistry and Technology

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“…For instance, elongated rigid particles are added into fluids to confer special final properties to the composite material [1][2][3][4]. Also, shape anisotropy of bioparticles such as bacteria [5][6][7], microswimmers [8], sperm cells [9], platelets [10] and hetero-cell aggregates [11] imparts peculiar dynamical properties to the overall flowing materials.…”

Section: Introductionmentioning

confidence: 99%

Bistability and metabistability scenario in the dynamics of an ellipsoidal particle in a sheared viscoelastic fluid

et al. 2014

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The motion of an ellipsoidal particle in a viscoelastic liquid subjected to an unconfined shear flow is addressed by numerical simulations. A complex dynamics is found with different transients and long-time regimes depending on the Deborah number De (De is the product of the viscoelastic liquid intrinsic time times the applied shear rate). Spiraling orbits toward a log-rolling motion around the vorticity are observed for low Deborah numbers, whereas the particle aligns with its major axis near to the flow direction at high Deborah numbers. The transition from vorticity to flow alignment is characterized by a periodic regime with small amplitude oscillations around orientations progressively shifting from vorticity to flow direction by increasing De. A range of Deborah numbers is detected such that the periodic solution coexists with the flow alignment regime (bistability). A further range of De is found where flow alignment is attained differently for particles starting far from or next to the shear plane: in the latter case, very long transients are found; hence an effective bistability (metabistability) is predicted to occur in a large time lapse before reaching the fully aligned state. Finally, the computed Deborah number values for flow alignment favorably compare with available experimental data. © 2014 American Physical Society

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“…Figure 1 ( 1 ) is a schematic representation of uniaxially oriented short fiber-elastomer composite that shows the distributive state of the fibers (as phase " f ") in the matrix elastomer (as phase "m") . ( 2 ) is the equivalent model of the composite in Figure 1 ( 1 ) . The fiber and the matrix elastomer are completely bonded to each other.…”

Section: Theory Of Micromechanicsmentioning

confidence: 99%

Dynamic viscoelasticities for short fiber‐thermoplastic elastomer composites

Guo

Ashida

1993

J of Applied Polymer Sci

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SYNOPSISDynamic moduli, E' and E", and loss tangent tan 6 were investigated for thermoplastic elastomers ( TPEs ) , styrene-isoprene-styrene copolymers ( SISs) , styrene-butadiene-styrene copolymer (SBS) , and Hytrel and composites reinforced by poly (ethylene terephthalate) (PET) short fibers. The styrenic TPEs have a typical rubbery behavior and the Hytrel T P E has medial characteristics between rubber and plastic. Both E' and E" of the composites depended on the matrix as well as the fiber loading and fiber length. Based on the viewpoint of different extensibility between the fiber and the matrix elastomer, a triblock model was considered for estimating the storage modulus of the short fiber-TPE composites as follows: E, = a VfE, + /3( 1 -V , ) Em, where a and / 3 are the effective deformation coefficients for the fiber and the matrix elastomer, respectively. They can be quantitatively represented by modulus ratio M ( = E , / E f ) and fiber length L:, where the constants n and k are obtained experimentally.When k = 0.022 and n = 0.45, E, of the TPE composites agreed well with the prediction of the proposed model. The relaxation spectrum of the composites showed a distinct main peak ascribed to the matrix elastomer, but no peak to the PET fiber. The relative damping of main relaxation, (tan &,ax)c/( tan 6, , ), , , , decreased monotonously with increasing fiber loading and fiber length and with decreasing modulus of matrix elastomer. Thus, the relative damping may be attributed not only to the volume effect of matrix, but also to the unevenness of the strain distribution in the matrix phase, which depends on the fiber length and the matrix's modulus. The findings prove that the different extensibility between fiber and matrix and the uneven distribution of strain in matrix were important for the short-fiber reinforcement of the TPE composites.

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Short Fiber Reinforced Elastomers

Cited by 101 publications

References 0 publications

Factors Influencing Reinforcement of Nr and Epdm Rubbers With Short Aramid Fibers

Factors Influencing Reinforcement of Nr and Epdm Rubbers With Short Aramid Fibers

Bistability and metabistability scenario in the dynamics of an ellipsoidal particle in a sheared viscoelastic fluid

Dynamic viscoelasticities for short fiber‐thermoplastic elastomer composites

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