On rheological properties of polydisperse polymers

Malkin, A. Ya.; Blinova, N. K.; Vinogradov, G. V.; Zabugina, M.P.; Sabsai, O. Yu.; Shalganova, V.C.; Kirchevskaya, I.Yu.; Shatalov, V.P.

doi:10.1016/0014-3057(74)90210-9

Cited by 52 publications

(4 citation statements)

References 15 publications

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“…However, the viscosity in the non‐Newtonian region is associated with the possibility of induced transition of macromolecules to the rubbery or glassy states. [ 63,64 ] In the case of the styrene‐isoprene triblock copolymer, the non‐Newtonian flow should be associated with the behavior of the microphase formed by the styrene blocks, due to the greater proximity of its glass transition temperature to the test temperature. In other words, when the introduction of small amounts of asphaltenes, they concentrate and plasticize the microphase of isoprene blocks but do not change the microphase behavior of the styrene blocks.…”

Section: Resultsmentioning

confidence: 99%

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Ignatenko

Kostyuk

Смирнова

et al. 2020

Polymer Engineering & Sci

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The use of heavy crude oil asphaltenes and resins (termed asphaltenes) as the components of hot‐melt adhesives based on the styrene‐isoprene triblock copolymer was considered. The rheological, thermophysical, strength, and adhesive characteristics of the mixtures containing from 10 to 40 wt% of asphaltenes were studied. The addition of 10 to 20 wt% of asphaltenes enhanced the strength and adhesive properties of the mixtures and only slightly changed their rheology. The higher concentrations of asphaltenes reduced the viscosity of the mixtures but did not lead to improved characteristics of the adhesives. The ambiguous effect of asphaltenes is probably due to their uneven distribution between the microphases of the block copolymer as well as their ability to act both plasticizers and reinforcing particles depending on temperature. A comparison of asphaltenes and conventional tackifiers based on hydrocarbon resins revealed their comparable effect on the properties of the block copolymer.

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Section: Resultsmentioning

confidence: 99%

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Ignatenko

Kostyuk

Смирнова

et al. 2020

Polymer Engineering & Sci

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“…The line is eq 15, the pure component relationship for polybutadiene, and data for the mixtures fall nicely along that line. The departures are small and seem mainly related to deviations of the pure component values for eq 15, perhaps due to small inaccuracies in the molecular weights. That uncertainty can be eliminated by expressing the weight-average dependence in terms of pure components viscosities.17 From eq 11 and 12 Vo = fás(vo)s1/a + <t>h(vo) L1/a]" (22) Viscosities from Figure 18 are replotted in Figure 19 as a function of 0L.…”

Section: Methodsmentioning

confidence: 93%

“…Figure15. Schematic representation of relaxation time vs. matrix molecular weight for highly entangled linear chains.…”

mentioning

confidence: 99%

Effects of polydispersity on the linear viscoelastic properties of entangled polymers. 1. Experimental observations for binary mixtures of linear polybutadiene

Struglinski¹,

Graessley²

1985

Macromolecules

270

269

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“…Now let us take a polydisperse polymer prepared as a mixture of monodisperse fractions. One can observe that it becomes non-Newtonian at the shear rate strictly equal to the critical shear rate of the fraction with the highest molecular weight [2].…”

Section: F L O W Curve -M O L E C U L a R W E I G H T D I S T R I B Umentioning

confidence: 97%

Some inverse problems in rheology leading to integral equations

Malkin¹

1990

Rheol Acta

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Two inverse problems of the integral type, which are of the general importance to rheology, are discussed. The first of them is the possibility of calculating the molecular weight distribution (MWD) from the flow curve and the second one is the interrelation between creep and relaxation functions. It was shown that the first problem is incorrect and any solution is unstable in respect to minor experimental errors. It means that the general solution of this problem is impossible in principle and only estimations of the width of unimodal MWD can be received from the curvature of the flow curve. The possibility of the correct calculation of the creep function exists in case the relaxation curve being approximated by the sum of exponential members. But the approximation of the relaxation curve within the experimental accuracy is the necessary, but not sufficient condition for the correct solution of this integral inverse problem, because not every mode of approximation leads to the satisfactory prediction of creep function.

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On rheological properties of polydisperse polymers

Cited by 52 publications

References 15 publications

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Asphaltenes as a tackifier for hot‐melt adhesives based on the styrene‐isoprene‐styrene block copolymer

Effects of polydispersity on the linear viscoelastic properties of entangled polymers. 1. Experimental observations for binary mixtures of linear polybutadiene

Some inverse problems in rheology leading to integral equations

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