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Unimodal and Bimodal Networks of Poly(dimethyl‐siloxane) in Pure Shear by Shuhong Wang; J. E. Mark is a Materials Science article available to read on EtoBox.

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## Abstract Model networks of poly(dimethylsiloxane) (PDMS) were prepared by tetrafunctionally endlinking hydroxyl‐terminated chains of various molecular weights. Some networks were prepared from mixtures of chains so as to yield a bimodal distribution of network chain lengths and, in some cases, these networks were prepared in solution. The stress–strain behavior of these unimodal and bimodal networks was studied in pure shear, which was imposed by stretching a sheet of the network having a large ratio of width to length in the direction perpendicular to the width. The pure‐shear moduli of both types of networks generally were found to depend markedly on strain. Stress–strain isotherms for unimodal networks prepared from chains of one or the other of two molecular weights were well interpreted using the constrained‐junction model of Flory and Erman. The bimodal networks showed large increases in the pure‐shear modulus at high strains which were similar to those reported for uniaxial extension and compression. Endlinking in solution decreases the modulus in general and its upturn in particular, presumably because of diminished chain‐junction entangling.

Who reads Unimodal and Bimodal Networks of Poly(dimethyl‐siloxane) in Pure Shear?

Author

Shuhong Wang; J. E. Mark

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-6266)

Published

1992

Language

EN

Field

Materials Science (Physical Sciences)