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Deformation behavior of poly(dimethyl siloxane) networks. I. Applicability of various theories to modulus prediction
Author(s) -
Venkatraman S.
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.1993.070480806
Subject(s) - siloxane , shear modulus , materials science , deformation (meteorology) , polymer , modulus , moduli , thermodynamics , shear (geology) , composite material , dilution , polymer science , physics , quantum mechanics
The shear moduli of end‐linked poly(dimethyl siloxane) networks were measured as a function of mol wt between chemical crosslinks ( M c ) and the dilution‐at‐cure ( C x ). The results were interpreted in terms of theories that take into account contributions from trapped entanglements. It was found that the network deformation follows the predictions of the theory of “phantom” networks, with an added contribution from trapped entanglements. At high mol wts of the precursor polymer, network imperfections play a role, as seen in the frequency dependence of the shear modulus. This results in deviation from predicted behavior. © 1993 John Wiley & Sons, Inc.