The Properties of 'RADEL R' Polysulfone

Roovers, Jacques; Ethier, R.; Toporowski, P. M.

doi:10.1177/152483999000200301

Cited by 14 publications

(11 citation statements)

References 12 publications

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“…Nonetheless, many 34,35,37 -condition-based chain dimensions illustrate that useful rheological approximations are feasible. It was shown previously 5 that M e could be expressed as follows:…”

Section: Resultsmentioning

confidence: 99%

“…Nonetheless, many34, 35, 37 θ‐condition‐based chain dimensions illustrate that useful rheological approximations are feasible. It was shown previously5 that M e could be expressed as follows: where The merit in this use of K θ as the chain dimension source is shown in Figure 5, where we find an acceptable correlation when M e is plotted against [ρ K θ ] −2 .…”

Section: Resultsmentioning

confidence: 99%

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Melt‐state polymer chain dimensions as a function of temperature

Krishnamoorti

Graessley

Zirkel

et al. 2002

J Polym Sci B Polym Phys

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The unperturbed chain dimensions (͗R 2 ͘ o /M) of cis/trans-1,4-polyisoprene, a near-atactic poly(methyl methacrylate), and atactic polyolefins were measured as a function of temperature in the melt state via small-angle neutron scattering (SANS). The polyolefinic materials were derived from polydienes or polystyrene via hydrogenation or deuteration and represent structures not encountered commercially. The parent polymers were prepared via lithium-based anionic polymerizations in cyclohexane with, in some cases, a polymer microstructure modifier present. The polyolefins retained the near-monodisperse molecular weight distributions exhibited by the precursor materials. The melt SANS-based chain dimension data allowed the evaluation of the temperature coefficients [dln ͗R 2 ͘ o /dT()] for these polymers. The evaluated polymers obeyed the packing length (p)-based expressions of the plateau modulus, G N o ϭ kT/n t 2 p 3 (MPa), and the entanglement molecular weight, M e ϭ N a n t 2 p 3 (g mol Ϫ1 ), where n t denotes the number (ϳ21) of entanglement strands in a cube with the dimensions of the reptation tube diameter (d t ) and is the chain density. The product n t 2 p 3 is the displaced volume (V e ) of an entanglement that is also expressible as pd t 2 or kT/G N o .

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Melt‐state polymer chain dimensions as a function of temperature

Krishnamoorti

Graessley

Zirkel

et al. 2002

J Polym Sci B Polym Phys

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“…Figure11. Relationship between the sub-Tg relaxation temperature Tyi and fractional free volume for various polysulfones.…”

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confidence: 99%

Gas transport properties of biphenol polysulfones

Aitken¹,

Koros²,

Paul³

1992

Macromolecules

141

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Gas sorption and transport properties at 35 °C are reported for the polysulfone based on 4,4'-biphenol (BIPSF) and corresponding polysulfones with methyl ring substitutions, tetramethylbiphenol polysulfone (TMBIPSF) and hexamethylbiphenol polysulfone (HMBIPSF). Comparisons are made to bisphenol A polysulfone (PSF) and tetramethylbisphenol A polysulfone (TMPSF). BIPSF and PSF have very similar transport characteristics. This is attributed to the similar packing behavior of these polymers. Tetramethyl substitution on the biphenyl rings increases permeability, while hexamethyl substitution does not lead to a comparable further increase but does enhance selectivity characteristics for certain gas pairs. Permeability values are discussed in terms of chain packing, fractional free volume, and sub-T, relaxation behavior.

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“…Me = 1300at350°C. 13 In this paper we report the synthesis and characterization of methyl-substituted PEEK (Me-PEEK) . Introduction of one methyl group per repeat unit constitutes the smallest possible structural change and leaves the all-para aryl-ether-ether-ketone sequence unaltered.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and molecular characterization of narrow molecular weight distribution fractions of methyl-substituted poly(aryl ether ether ketone)

Wang¹,

Roovers²,

Toporowski³

1993

Macromolecules

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Poly(aryl ether ether ketone) (PEEK) is a high-performance polymer. However, it is difficult to study the properties of PEEK because it has a high tendency to crystallize and is only soluble in strong acids at room temperature. Furthermore, the viscoelastic properties of the amorphous melt cannot be studied in the important Tt < T < Tt + 175 °C temperature range. Therefore, methyl-substituted poly(aryl ether ether ketone) (MePEEK) has been studied as a replacement for PEEK. The polymer has been fractionated and the fractions have been characterized by light scattering and intrinsic viscosity measurements in NMP and methanesulfonic acid. The results indicate that MePEEK is a freely rotating polymer with the characteristic ratio of C" = 2.44. The molecular weight dependence of the glass transition temperature is established. The viscoelastic properties of the melts have been measured between 170 and 250 °C. The molecular weight between entanglements, Me = 1450, has been calculated from the plateau modulus and is related to the molecular characteristics of the aryl-ether-ether-ketone chain.

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The Properties of 'RADEL R' Polysulfone

Cited by 14 publications

References 12 publications

Melt‐state polymer chain dimensions as a function of temperature

Melt‐state polymer chain dimensions as a function of temperature

Gas transport properties of biphenol polysulfones

Synthesis and molecular characterization of narrow molecular weight distribution fractions of methyl-substituted poly(aryl ether ether ketone)

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