Strength of Elastomeric Adhesive Films in the Triaxial Stress State

Sosin, S.E.; El'kin, A.I.; Vinogradov, G. V.

doi:10.1080/00914038008077941

Cited by 1 publication

(2 citation statements)

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“…The outlet edge is a stress raiser, which results in large and prominent transverse grooves on the extrudate during spurting. Since the adhesion of PB to steel and glass is good [15,16], the spurting at the outlet edge does not propagate into the channel, and the flow curve is not affected. The adhesion of PB to Teflon is much poorer, therefore, the spurting at the outlet edge propagates into the channel to a considerable depth.…”

Section: The Effect Of Capillary Wall Materials On Polymer Flow and Spmentioning

confidence: 95%

“…As soon as the tensile stress becomes equal to the critical value, the cohesion strength of the polymer is attained [15,16] and it may break. At the same time the stored elastic strain of the polymer in the capillary reaches its critical value, which leads to decrease of adhesion of the polymer to the channel wall, the polymer detaches itself from the wall, and a smooth jet is ejected from the channel.…”

Section: Introductionmentioning

confidence: 99%

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The rheological behavior of flexible-chain polymers in the region of high shear rates and stresses, the critical process of spurting, and supercritical conditions of their movement at T > Tg

1984

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Methods of capillary viscometry were used in studying the rheological properties and behavior of a broad range of rubbers, including polymers with narrow and wide molecular-weight-distribution as well as commercial rubber grades, at widely varying shear rates and stresses. As is shown, in full conformity with the previously conducted experiments, during transition from a fluid to highelastic (quasi-cross-linked) state, they are chracterized by spurting followed by sliding over the channel walls. This relaxation transition is characterized by a critical shear stress value invariant with respect to the molecular weight, molecularweight distribution and temperature. The parameters defining spurting of polymer flow as a function of molecular-weight characteristics, temperature, and channel geometry have been investigated in detail. It is shown for the first time that under supercritical conditions the rate of polymer flow through channels does not depend, in the first approximation, on the molecular weight of the polymer, its molecularweight distribution, temperature, and filling, but is determined only by the shear stress.

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Section: The Effect Of Capillary Wall Materials On Polymer Flow and Spmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%