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Mill Processability, Rheology and Structure Differences of Polyacrylate Elastomers by N. Nakajima; R. A. Miller; E. R. Harrel is a Materials Science article available to read on EtoBox.

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## Abstract Two commercial polyacrylate elastomers, one having epoxide (EP) crosslinking sites and the other ethylidene norbornene (ENB) were selected. It was demonstrated that the former was more difficult to mill-process than the latter. The viscoelastic properties measured at very small strain in shear oscillation indicated that the ENB polymer was more branched than the EP polymer. The gel determination by filteration confirmed this. The tensile stress-strain measurements were conducted at four different deformation rates. These data were treated according to the strain-time correspondence principle to see if this principle applies to the data of these samples. The data of EP polymer did not form a master curve, thus, the above principle is not applicable; at the larger deformation the strain-hardening tendencies were observed. This indicates that the EP polymer has a rather extensive long branching, a type of which usually results from a chain transfer reaction. The data of the ENB polymer, on the other hand, form a master-curve; that is, the strain-time correspondence principle is applicable, in spite of the presence of the large amount of gel. This means that the gel in the

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Author

N. Nakajima; R. A. Miller; E. R. Harrel

Publisher

Walter de Gruyter GmbH

Published

1987

Field

Materials Science (Physical Sciences)