Viscometric behaviour of polymer blends based on poly (vinylidene fluoride)

Soria, Vicente; Gómez, Clara M.; Rodríguez, Pablo; Parets, Maria Jesus; Campos, Agustı́n

doi:10.1007/bf00653213

Cited by 19 publications

(11 citation statements)

References 13 publications

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“…This definition is not valid for systems that have negative values for b 22 or b 33 ; therefore, the modification of Williamson and Wright27 is used to evaluate b 23 as b 23 = ( b 22 + b 33 )/2, as is usual in the literature 2. 3, 28 The parameters b 22 and b 33 are easily determined from the binary systems formed by polymers (2) or (3) in the solvent, respectively. According to this approach, the information about thermodynamic intermolecular interactions between polymers (2) and (3) should be obtained from a comparison between experimental $b_{23}^{(1)}$ (from eqn 3, and theoretical b 23 values by means of a parameter Δ b which is given by $\def\ex{\hbox{ }} \Delta b=b_{23}^{(1)}-b_{23}$ .…”

Section: Resultsmentioning

confidence: 99%

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Polymer–polymer interaction, in the presence of a solvent as measured by viscometry

Gómez

Porcar

Recalde

et al. 2001

Polymer International

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Dilute solution viscometry experiments have been carried out in five ternary polymer systems solvent(1)/polymer(2)/polymer(3). Values of the specific viscosity of polymer (3) in a ‘binary solvent’ formed by polymer(2) + solvent(1) have been used to determine the compatibility of the polymer blends. Krigbaum and Wall formalism has been used to predict compatibility which relies on an interaction parameter $b_{23}^{(1)}$ that depends on the concentration, weight fraction and molar mass of each polymer. To reduce the dependences and to clarify the criterion of compatibility, a parameter $b_{23}^{(2)}$ independent of polymer (3) composition and molar mass has been deduced. This parameter shows the same behaviour with polymer(2) concentration as the Stockmayer–Fixman parameter B. © 2001 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

“…In the hypothetical case that Δ b = 0, it would signify that chains interact neither favourably nor unfavourably 1. 3, 28, 29…”

Section: Resultsmentioning

confidence: 99%

Polymer–polymer interaction, in the presence of a solvent as measured by viscometry

Gómez

Porcar

Recalde

et al. 2001

Polymer International

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“…Experiments demonstrate that

\overset{ε}{true}

need not always be negative, in contrast to expectation. In special cases,

\overset{ε}{true}

may become positive; according to the results shown in Figure , such a behavior is bound to very low λ AB values and is most pronounced for MM systems.…”

Section: Model Calculations Concerning Intrinsic Viscosities Of Blendmentioning

confidence: 99%

Intrinsic Viscosities of Polymer Blends and Polymer Compatibility: Self‐Organization and Flory–Huggins Interaction Parameters

Wolf

2018

Macro Chemistry & Physics

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Intrinsic ViscositiesThe intrinsic viscosity of polymer blends in a common solvent may deviate markedly from additivity. Such behavior testifies favorable interactions between the two types of macromolecules. Under these conditions, isolated polymer coils contain one macromolecule of each species and represent the simplest possible case of self-organization. The particular thermodynamic situation required for the occurrence of that phenomenon is being analyzed in terms of microphase equilibria by means of an approach, which subdivides the dilution process into two steps. The first step quantifies the opening of intersegmental contacts at constant conformations of the components and the second step the conformational relaxation required to attain equilibrium. The intrinsic viscosities resulting for the mixed isolated coils are normally smaller than calculated from additivity. However, the opposite behavior can also occur under special conditions. The possibilities to gain quantitative information on polymer/polymer interaction parameters from the intrinsic viscosities of polymer blends are being discussed.

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“…This definition is not valid for systems that have negative values of b 22 or b 33 ; therefore, the modification of Williamson and Wright [14] is generally used to evaluate b 23 as b 23 ¼ (b 22 þ b 33 )/2. [7,16,17] The parameters b 22 and b 33 are easily determined from the binary systems formed by polymer(2) or polymer(3) in the common solvent, respectively. According to this approach, information on intermolecular interactions between polymer (2) …”

Section: Theoreticalmentioning

confidence: 99%

Compatibility Studies of Pairs of Polymers by Viscometric Measurements on Ternary Solutions of the Two Polymers

Melad

Mark

2005

Journal of Macromolecular Science, Part B

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Dilute solution viscometry results at 30.08C are reported for three ternary solvent(1)/ polymer(2)/polymer(3) systems involving tetrahydrofuran (THF), polystyrene (PS), polybutadiene (PBD), poly(dimethylsiloxane) (PDMS), and poly(vinyl chloride) (PVC), specifically for the systems THF/PS/PBD, THF/PDMS/PVC, and THF/ PVC/PS. Interaction parameters determined for both these ternary systems and binary solvent-polymer combinations were used to estimate degrees of compatibility. A number of criteria were applied and the results analyzed and compared. Compatibility was found for the THF/PS/PBD and THF/PDMS/PVC systems, but incompatibility for THF/PVC/PS system, results which should help clarify compatibilities of the corresponding polymer pairs in blends.

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Viscometric behaviour of polymer blends based on poly (vinylidene fluoride)

Cited by 19 publications

References 13 publications

Polymer–polymer interaction, in the presence of a solvent as measured by viscometry

Polymer–polymer interaction, in the presence of a solvent as measured by viscometry

Intrinsic Viscosities of Polymer Blends and Polymer Compatibility: Self‐Organization and Flory–Huggins Interaction Parameters

Compatibility Studies of Pairs of Polymers by Viscometric Measurements on Ternary Solutions of the Two Polymers

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