Relation between some rheological properties of polyisobutylene solutions and their mode of preparation

Khalil, Karim S.; Tougui, Abdellah; Sigli, D.

doi:10.1016/0377-0257(94)85030-5

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The viscosity for all polyol/clay dispersions was determined at 20 °C. Attempts to fit these rheological data with a power law, the Carreau model31 or the Cross model32 were not successful. However, the data could be fitted very well with the Herschel–Bulkley model,33 which is commonly used to describe materials such as mud, clay suspensions, oil and drilling fluids 34, 35.…”

Section: Resultsmentioning

confidence: 99%

Intercalation and exfoliation behaviour of clay layers in branched polyol and polyurethane/clay nanocomposites

Xia

Song

2006

Polymer International

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The exfoliation of clay layers was realized in a tri‐hydroxyl branched polyether polyol by direct mixing and the corresponding exfoliated polyurethane/clay nanocomposite was prepared by further in situ curing. The effects of various surface‐modified organoclays and various polyol types on the intercalation and exfoliation behaviour of clay layers were investigated. The interaction between the polyol and clay and the mixing temperature plays an important role in the occurrence of exfoliation and intercalation. The relationship between rheological data of polyol/clay dispersion and the intercalation or exfoliation state of the clay was established. This provides a convenient and efficient way to evaluate the dispersion state of the clay. Based on the experimental results, a possible layer‐by‐layer exfoliation mechanism is proposed. Copyright © 2006 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Intercalation and exfoliation behaviour of clay layers in branched polyol and polyurethane/clay nanocomposites

Xia

Song

2006

Polymer International

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“…The two components were mixed in an amber glass bottle and time (approximately 6 months) was given for the PIB to completely dissolve while performing only a gentle agitation at room temperature to prevent degradation of the PIB (Khalil et al 1994). The dissolution process was monitored by performing repetitive rheological measurements on the sample until no changes were observed and a stable solution was obtained.…”

Section: A Materialsmentioning

confidence: 99%

TTS in LAOS: validation of time-temperature superposition under large amplitude oscillatory shear

et al. 2011

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The validation of time-temperature superposition (TTS) of non-linear parameters obtained from large amplitude oscillatory shear (LAOS) is investigated for a model viscoelastic fluid. Oscillatory time sweeps were performed on a 11 wt% solution of high molecular weight polyisobutylene in pristane as a function of temperature and frequency and for a broad range of strain amplitudes varying from the linear to the highly non-linear regime. Lissajous curves show that this reference material displays strong non-linear behavior when the strain amplitude is exceeding a critical value. Elastic and viscous Chebyshev coefficients and alternative non-linear parameters were obtained based on the framework of Ewoldt et al. ( 2008) as a function of temperature, frequency, and strain amplitude. For each strain amplitude, temperature shift factors a T (T) were calculated for the first order elastic and viscous Chebyshev coefficients simultaneously, so that master curves at a certain reference temperature T ref were obtained. It is shown that the expected independency of these shift factors on strain amplitude holds even in the non-linear regime. The shift factors a T (T) can be used to also superpose the higher order elastic and viscous Chebyshev coefficients and the alternative moduli and viscosities onto master curves. It was shown that the Rutgers-Delaware rule also holds for a viscoelastic solution at large strain amplitudes.

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Visualisation of the Flow Field of a Polymer Solution in an Open Channel

Nistoran

Bălan

Brujan

et al. 1998

Progress and Trends in Rheology V

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Relation between some rheological properties of polyisobutylene solutions and their mode of preparation

Cited by 4 publications

References 12 publications

Intercalation and exfoliation behaviour of clay layers in branched polyol and polyurethane/clay nanocomposites

Intercalation and exfoliation behaviour of clay layers in branched polyol and polyurethane/clay nanocomposites

TTS in LAOS: validation of time-temperature superposition under large amplitude oscillatory shear

Visualisation of the Flow Field of a Polymer Solution in an Open Channel

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