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Polymer–solvent interaction observed in rubbery plateau modulus
Author(s) -
Nakajima N.,
Varkey J. P.
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199808)46:4<298::aid-pi19>3.0.co;2-q
Subject(s) - plasticizer , plateau (mathematics) , materials science , polymer , modulus , solvent , natural rubber , composite material , butyl rubber , polymer chemistry , chemistry , organic chemistry , mathematics , mathematical analysis
The conventional wisdom is that concentration dependence of the rubbery plateau modulus of polymer solutions is independent of the material. However, in industrial practice, sometimes a small addition of miscible liquid lowers the modulus significantly whilst at other times it hardly affects it. This work examines an example of the former case (nitrile rubber–plasticizer systems) and one of the latter (acrylic rubber–plasticizer systems). Two possible explanations are offered for the observed behaviour. One is a possible contribution of a polar association to the plateau modulus: when a solvent breaks the association it gives the former case and when it does not, it gives the latter. The other explanation is a possible contraction of polymer coils from unperturbed size giving the former case, and an expansion giving the latter. Changes of less than a few percent of the coil‐radius are sufficient to explain the above behaviour © 1998 SCI.