Assessment of time-temperature superposition of linear viscoelastic behaviour of strongly interacting polymer blends: N-methylated nylon-2,10 and lightly sulfonated polystyrene ionomers

Hagen, R.W.; Weiß, Robert

doi:10.1016/0032-3861(95)96833-t

Cited by 17 publications

(6 citation statements)

References 23 publications

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“…Figure also illustrates the plasticizing effect of the addition of salt by shifting the T g to lower temperatures. This confirms the interplay between the salt concentration and the temperature, suggested by Tan et al as well as that of the time and the salt concentration put forward by Spruijt et al Thus, building on the well‐known (but still not fully understood) time/temperature superposition principles for polymer mechanical properties, there appears to be a time/temperature/salt doping equivalence for PECs. The data obtained for PDADMA/PSS exPECs suggested an empirical relationship between the three variables: T g = 38 + 2.3ln f − 20[NaCl] 6/5 .…”

Section: Macroscopic Propertiessupporting

confidence: 82%

Saloplastics: Processing Compact Polyelectrolyte Complexes

2015

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Polyelectrolyte complexes (PECs) are prepared by mixing solutions of oppositely charged polyelectrolytes. These diffuse, amorphous precipitates may be compacted into dense materials, CoPECs, by ultracentrifugation (ucPECs) or extrusion (exPECs). The presence of salt water is essential in plasticizing PECs to allow them to be reformed and fused. When hydrated, CoPECs are versatile, rugged, biocompatible, elastic materials with applications including bioinspired materials, supports for enzymes and (nano)composites. In this review, various methods for making CoPECs are described, as well as fundamental responses of CoPEC mechanical properties to salt concentration. Possible applications as synthetic cartilage, enzymatically active biocomposites, self-healing materials, and magnetic nanocomposites are presented.

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Section: Macroscopic Propertiessupporting

confidence: 82%

Saloplastics: Processing Compact Polyelectrolyte Complexes

2015

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“…This is in contradiction to what is reported in the classic polymer literature and it is still believed that t-T superposition is not valid for semicrystalline materials and copolymers [34,36]. Even though, it has been shown that t-T superposition is applicable to miscible and partially immiscible semicrystalline and amorphous polymer blends [38], polymer liquid crystals [35] and polymer liquid crystals blended with semicrystalline polymers [37]. These measurements were performed to make sure that t-T superposition is valid for POM copolymers, since this information was not available in the literature.…”

Section: Creep Compliancecontrasting

confidence: 67%

Viscosity and creep compliance of polyoxymethylene copolymers of various average molecular weights

et al. 2015

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The effect of average molecular weight (M w) of polyoxymethylene (POM) on melt viscosity and solid state creep compliance were investigated. Viscosity follows the power function of M w. Creep compliance results indicate that time-temperature superposition applies to POM copolymers. Creep compliance in a short time (0.25 s) is independent of M w , but in a longer time (10 years) it follows an inverse power law relation with M w , up to a critical value of M w = 81 100, where creep compliance becomes independent of M w. At intermediate time (17 min), similar to short one, no effect on susceptibility to creep compliance was observed. It was also stated that the activation energy is independent of M w .

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“…Time (frequency) and temperature are often interrelated using time/temperature superposition (TTS) where data collected at different temperatures can be reduced to a master curve using a shift factor (a T ). 38,39 The dynamic modulus G*, calculated from the data measured in DMTA experiments at different temperatures, was plotted versus time (reciprocal of frequency). A shift factor (a T ) was applied to correct for the horizontal difference on the time axis for the curves at different temperatures.…”

Section: Differential Scanningmentioning

confidence: 99%

Thermal Transformations in Extruded Saloplastic Polyelectrolyte Complexes

et al. 2012

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Extruded, salt-plasticized complexes of hydrated p o l y ( s t y r e n e s u l f o n a t e ) , P S S , a n d p o l y -(diallyldimethylammonium), PDADMA, were analyzed by differential scanning calorimetry and dynamic mechanical thermal analysis. Whereas the enthalpic signatures were weak, the latter technique revealed a strong transition in modulus, identified as a glass transition. The temperature of this transition, T g , varied with deformation rate as expected from time/temperature superposition. T g also decreased with increasing salt doping, which breaks ion pairing in the complexes, confirming the plasticizing effect of doping. Time, temperature, and salt concentration data were superposed to demonstrate the trends/equivalence of these three variables, and an empirical equation was used to connect them. Measurement time regimes were discussed with reference to the average lifetime of an ion pair.

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Assessment of time-temperature superposition of linear viscoelastic behaviour of strongly interacting polymer blends: N-methylated nylon-2,10 and lightly sulfonated polystyrene ionomers

Cited by 17 publications

References 23 publications

Saloplastics: Processing Compact Polyelectrolyte Complexes

Saloplastics: Processing Compact Polyelectrolyte Complexes

Viscosity and creep compliance of polyoxymethylene copolymers of various average molecular weights

Thermal Transformations in Extruded Saloplastic Polyelectrolyte Complexes

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