Factors Controlling the Dynamic Properties of Elastomeric Products

Abstract

Both static and dynamic properties were determined for a number of rubbery vulcanizates. Selected compositional, processing, de sign, and testing variables have been evaluated and discussed for a group of general-purpose elastomers, with emphasis on natural rubber (NR) and styrene-butadiene (SBR) compositions. Compositional variables such as carbon black, plasticizer, and curing system have an important influence on dynamic properties and some compositional variables selectively influence either the dynamic stiffness or damping characteristics. Variations in mixing are also shown to influence dynamic properties critically, especially at low testing strains. Cure time variations cause different dynamic responses as a function of elastomer type (NR versus SBR). Design in fluences on both static and dynamic properties are described. Increasing static preload in compression tests causes an increase in both the spring rate and the damping coefficient. The loss in dynamic stiffness, caused by prestrain, is shown to be recoverable through application of a suitable heat cycle.

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References

B.W. Ford and W.C. Warner , Rubber Chem. Technol., 44, 249 (1971).

A.R. Payne and R.E. Whittaker , ibid., 44, 440 (1971).

D.A. Meyer and J.G. Sommer , ibid., 44, 258 (1971).

M. Lowman and H.E. Keller , ibid., 37, 866 (1964).

R.M. Cardillo , paper presented at Sixth Annual Tlargi Foundation Technical Conference , University of Southern California, Los Angeles, June, 1965.

S.C.G. Chubb and G.M. Doyle , Journal I.R.I., 4, 30 (1970).

T.A. Knurek and R.P. Salisbury , Rubber World, 150, 46 (1964).

A.I. Medalia , Paper presented to Akron Rubber Group, Akron, OH, Jan. 26, 1973 .

A.R. Payne , R.E. Whittaker and J.F. Smith , J. Appl. Polymer Sci., 16, 1191 (1972).

10.

V.E. Gough , Journal I.R.I., 3, 262 (1969).

11.

B.B. Boonstra and A.I. Medal ia , Rubber Age, 92, 892 (1963).

12.

A.R. Payne , J. Appl. Polymer Sci., 9, 2273 (1965).

13.

L.R. Barker , A.R. Payne and J.F. Smith , Journal I.R.I. , 1, 206 ( 1967).

14.

A.M. Gessler , Rubber Age, 74, 59 (1953).

15.

A.R. Payne , P.M. Swift and M.A. Wheelans , J. Res. Inst. Malaya, 22, 275 (1969).

16.

F.F. Timpner , paper 966B presented at SAE International Automotive Congress, Detroit, January, 1965.

17.

R.C. Puydak and R.S. Auda , SAE Transactions 75, paper 660439 (1967).

18.

D.F. Kruse and R.C. Edwards , ibid., 77, paper 680471 (1968).

19.

A.R. Payne and J.R. Scott , "Engineering with Rubber." New York, NY, 1960, Chapt. 6.

20.

P.B. Lindley , "Use of Rubber in Engineering," edited by P. W. Allen , P. B. Lindley and A. R. Payne , London, Maclaren & Sons, 1967 .

21.

A.N. Gent and E.A. Meinecke , Poly. Eng. and Sci., 10, 48 (1970).

22.

A.R. Payne , The Engineer, 207, 328 (1959).

23.

Unpublished data, General Tire and Rubber Co.

24.

D. Bulgin , New Scientist, 14, 518 (1962).

25.

L.E. Nielsen , "Mechanical Properties of Polymers," Reinhold Publishing Corp., New York, NY , 1962, p. 162.

26.

G.E. Warnaka , Rubber Chem. Technol., 39, 1421 (1966).

27.

R.T. Larsen , SAE Journal, 75, 81 (Nov 1967 ).

28.

R.S. Auda and R.M. Cardillo , SAE SP-260, paper 650182, p 49 (Jan. 1965).

29.

W.E. Miller , Rubber Age, 100, 49 (1968).

30.

H.E. Miller and J.E. Nemec , paper presented to Rubber Division of the American Chemical Society , Cleveland, OH, October, 1971.