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Elastic properties of random‐linked cis ‐PB networks: A characterization and gel point study
Author(s) -
PyckhoutHintzen W.,
Müller B.,
Springer T.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070480513
Subject(s) - polybutadiene , stress relaxation , modulus , relaxation (psychology) , plateau (mathematics) , swelling , materials science , stress (linguistics) , gel point , thermodynamics , quantum entanglement , ultimate tensile strength , composite material , polymer chemistry , polymer , physics , mathematics , copolymer , quantum mechanics , mathematical analysis , creep , psychology , social psychology , linguistics , philosophy , quantum
cis ‐Polybutadiene networks with microstructure 98% cis, cross‐linked in the bulk state by gamma irradiation, were characterized in terms of their mechanical properties. Data from stress‐strain analyses, swelling degrees, stress relaxation, and random‐linking theory are in accordance and the estimated gel points practically coincide. Trapped entanglements lead to a 30% increase in the network modulus, from which also the plateau modulus, 0.71 ± 0.09 MPa, was determined. The tensile data were obtained from Mooney‐Rivlin representations without junction constrained corrections. Preliminary stress‐relaxation experiments indicated a slow relaxation at room temperature. It can be concluded that the assumption of additive contributions from chemical and entanglement cross‐link densities in the Langley theory works well in the range of doses investigated here. © 1993 John Wiley & Sons, Inc.