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Elastomeric properties of networks prepared from high‐cis and high‐trans 1,4‐polybutadienes
Author(s) -
Sharaf M. A.,
Mark J. E.,
Cesca S.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260408
Subject(s) - elastomer , materials science , elongation , swelling , elasticity (physics) , solvent , polymer , crystallization , irradiation , polymer chemistry , thermal decomposition , ultraviolet , thermodynamics , composite material , ultimate tensile strength , organic chemistry , chemistry , physics , optoelectronics , nuclear physics
Abstract Networks were prepared from a sample of 1,4‐polybutacliene having an extremely high cis content (98.5 mol percent) and from other samples having relatively high trans contents (72 to 80 mol percent). The cross‐linking techniques employed were gamma irradiation, ultraviolet irradiation, and peroxide thermolysis. The resulting elastomers were studied in elongation in the unswollen state at several temperatures, to their rupture points, and in swelling equilibrium in a good solvent. Values of the elasticity constant 2 C 1 obtained from the stress‐strain isotherms at low and moderate elongations gave values of the molecular weight M, between cross‐links in at least approximate agreement with those obtained from the swelling equilibrium data. The other elasticity constant 2 C 2 generally had relatively large values, suggesting inhomogeneous cross‐linking, but approached zero for small M c as expected from reduced configurational interpenetration. At high elongations, the reduced stress for the high‐ cis polymer showed marked upturns due to strain‐induced crystallization.