1975
DOI: 10.5254/1.3547449
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Anisotropy in Molded Nitrile Rubber

Abstract: Measurements of linear swelling in solvent of small test pieces provide a useful means of investigating anisotropy in vulcanized products and components whose small size precludes the use of conventional tests on dumbbells, etc. Anisotropy has been found to be present in molded components. The extent of this is related to the material flow in the mold before or during vulcanization. There also appears to be an effect of flow on crosslink density. In this preliminary investigation the contribution of each of th… Show more

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Cited by 2 publications
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“…In a previous work it was observed [44] that CB generally exhibits a reduction of aggregate breadth, or 'flatness', in one direction. Some works [45][46][47][48][49][50][51][52][53] evidenced slightly anisotropic properties in elastomeric systems, in both compression and injection molded rubber parts. The orientation of molecules during the mould-filling operation was identified as the dominating factor, and the presence of CB-MS was found to increase the anisotropy [54].…”
Section: Effect Of Filler Type (At 35 Phr Loading) On Anisotropic Behmentioning
confidence: 99%
“…In a previous work it was observed [44] that CB generally exhibits a reduction of aggregate breadth, or 'flatness', in one direction. Some works [45][46][47][48][49][50][51][52][53] evidenced slightly anisotropic properties in elastomeric systems, in both compression and injection molded rubber parts. The orientation of molecules during the mould-filling operation was identified as the dominating factor, and the presence of CB-MS was found to increase the anisotropy [54].…”
Section: Effect Of Filler Type (At 35 Phr Loading) On Anisotropic Behmentioning
confidence: 99%
“…During sheet rolling processes and injection moulding, the rubber is subjected to a complex set of deformation in the three directions simultaneously, imparting generic anisotropy to the network structure [11,12]. Compression-moulded rubber sheets are somewhat simpler, manifesting in-plane isotropy [13,14] Thus, anisotropy appears to be an intrinsic part of rubber processing despite the lack of a suitable theory to determine cross-link density for anisotropic systems. In this study, we first extend the Flory theory to account for generic anisotropy of swelling and then apply the theory to a series of directional swelling measurements on five different filled elastomers, including compression-moulded and rolled rubber sheets, to examine the nature of the anisotropy, and its influence on the determination of the molecular weight between cross-links.…”
Section: Introductionmentioning
confidence: 99%