Peculiarities of the rheological behaviour of filled materials in steady shear flow

Vinogradov, G. V.; Plotnikova, E. P.; Zabugina, M.P.; Borisenkova, E. K.

doi:10.1007/978-3-642-49337-9_132

Cited by 5 publications

(9 citation statements)

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“…(I I) and (12) taking into account only the particle mode, the decompositions (28) and (29) give C II;::: 1+ 2E\i) + "', C n ;::: 1 + 2EW + ''', C 12;:::2Eg>,…”

Section: A Simple Shearmentioning

confidence: 98%

“…Now making allowance for Eq. (24), we can write down the kinetic equations ( 12) and (26) (37) Equations (36a) and (36c) show that "viscoelastic" effects in the particle mode with a = 0 are only due to the floc's rupture (5'=1=0). The dimensionless system of stresses in the particle mode is al2=C 1Z, all=2(EII-Ezz), azz= -2EZZ' (38) where the dimensionless stresses in the particle mode are defined as follows: …”

Section: A Simple Shearmentioning

confidence: 99%

“…The initial conditions for the start up flow are of the form (12) Cij,nlt=o=oij (n=p,m), (13) and for the relaxation after cessation of the steady state flow, they are…”

Section: A Simple Shearmentioning

confidence: 99%

“…Later the shear flows of these compounds were studied more extensively by Bartenev and his co-workersf and Vinogradov et al 9 • 10 who found the yield-like behavior in the systems. In recent publications, 11, 12 Vinogradov and co-workers investigated small amplitude oscillations and steady state shear in various polymer compounds and discovered distinctly some stepwise increases in G' (Q)) and shear viscosity Tf by going through a critical concentration (-12 vol %) of carbon black. Some studies of the extrusion behavior of these materials were given by White and Crowder.…”

Section: Introductionmentioning

confidence: 98%

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On the rheology of filled polymers

Leonov¹

1990

Journal of Rheology

115

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On 1D instabilities in simple shear and extensional flows as predicted by some Maxwelllike constitutive equations J. Rheol. 36, 1515Rheol. 36, (1992 Influence of phase separation on the linear viscoelastic behavior of a miscible polymer blend Synopsis This paper develops a rheological model for flow of polymer compounds highly filled by small interacting (attractive) particles. The properties of the particle phase in the compound are described by introducing a viscoelastic "particle mode" with an additional kinetic equation which describes the processes of rupture and restoration of floes of particles. The elastic deformations in the particle mode are assumed to be small enough to consider the geometrical nonlinearities as second-order effects. The rheological behavior of the polymer matrix is modeled by means of nonlinear viscoelasticity, as in the case of pure polymer melts. It was shown that all the basic features of the yield-like and thixotropic behavior of the filled polymer compounds, including the appearance of yield values in steady state flows, stress overshoots in start up flows and effects of "frozen memory" during relaxation could be described by this approach without using the mathematical yield criteria. Some preliminary comparisons of the theory with steady state data are also demonstrated.

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“…(I I) and (12) taking into account only the particle mode, the decompositions (28) and (29) give C II;::: 1+ 2E\i) + "', C n ;::: 1 + 2EW + ''', C 12;:::2Eg>,…”

Section: A Simple Shearmentioning

confidence: 98%

Section: A Simple Shearmentioning

confidence: 99%

“…The initial conditions for the start up flow are of the form (12) Cij,nlt=o=oij (n=p,m), (13) and for the relaxation after cessation of the steady state flow, they are…”

Section: A Simple Shearmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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On the rheology of filled polymers

Leonov¹

1990

Journal of Rheology

115

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“…The ratio DIDo, where D is the extrudate diameter and Do is the channel diameter, characterizing the elastic recovery of PFEPh at the capillary exit, which in a broad temperature range appears to be close to or even less than one unit, whilst in the case of isotropic flexible chain polymer melts it approaches several units. Such low-swelling factors were noted for certain LC polymers and filled systems [45,46] and, in general, were related either to the existence of a yield point, which prevents stress relaxation and recovery of the elastic strain, or to the presence of a negative first difference of the normal stresses. The formation of fibrous structures in the extrudates was observed earlier in individual LC thermotropic stiff-chain polymers [45,47,48], as well as in incompatible polymer blends containing [49], or not containing, LC polymers [50].…”

Section: Rheological Properties Of Poly-bis-fluoroalkoxyphosphazenes mentioning

confidence: 98%

Mesophase State of Polyorganophosphazenes

Kulichikhin¹,

Антипов²,

Borisenkova³

et al. 1994

Partially Ordered Systems

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Earlier it was believed [1] that an ordering at a level exceeding the shortrange order of low molecular liquids cannot exist above the melting point in flexible-chain polymers which do not contain meso genic groups. However, recently, a large number of polymers, for example, polyphosphazene, has been found, which cannot be described in the framework of the traditional classification of liquid crystals. An additional type of mesomorphic state, that of a conformationally disordered crystal, was suggested [2,3].A more common approach is analyzing this type of mesophase as a threedimensional ordered crystal having a different perfection extent along each of its crystallographic dimensions. In order to gain a better insight into this problem, it is necessary to accumulate experimental evidence.Polyorganophosphazenes (PPh) with the following general formula:are of interest from the viewpoint of the meso phase class of polymers [4], since many of the representatives of this class may have an ordering level intermediate between a crystalline and an amorphous state in a broad temperature range [5]. A comprehensive review of earlier works on the structure and properties of PPh was published in [6]. The number of publications on the description of the structure, morphology, and characteristics of the physical transitions and physical-mechanical properties of these polymers has considerably increased in recent years. However, there is no complete information on the structure of PPh, especially in the mesomorphous state. V. P. Shibaev et al. (eds.), Liquid Crystalline and Mesomorphic Polymers

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Rheology of filled polymers

Malkin¹

1990

Advances in Polymer Science

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A l e x a n d e r Y. M a l k i n Research Institute o f Plastics, Perovskii proezd 35, U S S R 111 112, M o s c o w E-112, U S S R Published data, concerning the results of measuring rheological properties of polymer melts with rigid fillers, are discussed. The review is based mainly on the works of the 1980s. The effect of a filler's presence on three fundamental parameters of a material, namely yield stress, viscosity, and rubbery elasticity is considered. The analysis is based essentially on qualitative considerations with respect to physical phenomena appearing when a rigid filler is introduced into the melt. General rules associated with the effect of concentration, intermotecular interaction, size and form of filler particles on rheological properties of a composition are traced. The review does not mention hydrodynamic phenomena, specific for flows of liquids with rigid filler, and also rheology of non-flowing multicomponent materials.

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Peculiarities of the rheological behaviour of filled materials in steady shear flow

Cited by 5 publications

References 1 publication

On the rheology of filled polymers

On the rheology of filled polymers

Mesophase State of Polyorganophosphazenes

Rheology of filled polymers

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