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

Struglinski, Mark J.; Graessley, William W.

doi:10.1021/ma00154a046

Cited by 270 publications

(298 citation statements)

References 24 publications

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“…The gives rise to a terminal dispersion (loss tangent peak), rather than the usual divergence of tanδ toward infinity with increasing temperature (or decreasing frequency). A similar phenomenon is observed in sparsely branched polymers and bidisperse polymer blends, [24][25][26] crosslinked polymer networks containing unattached chains, 27-29 and particle-reinforced polymers. [30][31][32] This ambiguity in the results of Tsagaropoulos and Eisenberg 11,12 illustrates the caution required when interpreting viscoelastic data in terms of the effect of filler on the glass transition behavior.…”

Section: Dynamic Mechanical Spectroscopysupporting

confidence: 70%

Glass Transition and Interfacial Segmental Dynamics in Polymer-Particle Composites

Robertson

Roland

2008

Rubber Chemistry and Technology

153

125

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We review the literature concerned with the effect of proximity to a filler surface on the local segmental mobility of polymer chains. This mobility is commonly assessed from either the glass transition temperature, Tg, or the segmental relaxation times measured by mechanical, dielectric, or NMR spectroscopy. Published studies report increases, decreases, or no change in Tg upon the addition of carbon black, silica, and other reinforcing fillers. Similarly, the segmental relaxation times have been found to increase or be invariant to the presence of nanometer-sized particles. Some of these discrepancies can be ascribed to ambiguous methods of data analysis; others likely reflect the variation in filler-polymer interaction among different systems. There are unequivocal examples of polymers that have segmental dynamics and glass transitions unaffected by nano-particle reinforcement. However, the general principles governing the behavior remain to be clarified, with further work, focusing on the micromechanics at the particle interface, required for resolution of this important aspect of rubber science and technology.

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Section: Dynamic Mechanical Spectroscopysupporting

confidence: 70%

Glass Transition and Interfacial Segmental Dynamics in Polymer-Particle Composites

Robertson

Roland

2008

Rubber Chemistry and Technology

153

125

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“…Advances have been more forthcoming for polydisperse mixtures of LPs for three reasons, (i) there is a plethora of well-characterized experimental data [60,[206][207][208][209][210][211][212], (ii) rheological models have been built, tested, refined, and calibrated extensively [213], and (iii) it is possible to use approximate "double reptation-" type models [135,214], in lieu of the full tube model [142], which makes the mathematical model and its numerical solution more expedient.…”

Section: Methods and Progressmentioning

confidence: 99%

Analytical Rheology of Polymer Melts: State of the Art

Shanbhag

2012

ISRN Materials Science

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The extreme sensitivity of rheology to the microstructure of polymer melts has prompted the development of "analytical rheology," which seeks inferring the structure and composition of an unknown sample based on rheological measurements. Typically, this involves the inversion of a model, which may be mathematical, computational, or completely empirical. Despite the imperfect state of existing models, analytical rheology remains a practically useful enterprise. I review its successes and failures in inferring the molecular weight distribution of linear polymers and the branching content in branched polymers.

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“…Materials have been principally PS [105±108], and PB [109,110]. Experiments have considered cases in which the higher molecular weight chains are`self-dilute' or`probes' (so would not entangle with each other were the lower molecular weight fraction to be replaced by a solvent) [111], and where both fractions provide contributions to the entanglement network [109]. In the probe case, the lower molecular weight species may act as unentangled solvent, as far as the terminal relaxation time of the higher fraction is concerned, but the conditions for this are subtle.…”

Section: T C B Mcleish 1402mentioning

confidence: 99%

Tube theory of entangled polymer dynamics

McLeish

2002

Advances in Physics

836

1,122

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The dynamics of entangled¯exible polymers is dominated by physics general to many chemical systems. It is an appealing interdisciplinary ®eld where experimental and theoretical physics can work closely with chemistry and chemical engineering. The role of topological interactions is particularly important, and has given rise to a successful theoretical framework: the`tube model'. Progress over the last 30 years is reviewed in the light of specially-synthesized model materials, an increasing palette of experimental techniques, simulation and both linear and nonlinear rheological response. Our current understanding of a series of processes in entangled dynamics:`reptation',`contour length¯uctuation' and`constraintrelease' are set in the context of remaining serious challenges. Especial attention is paid to the phenomena associated with polymers of complex topology or`long chain branching'.

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

Cited by 270 publications

References 24 publications

Glass Transition and Interfacial Segmental Dynamics in Polymer-Particle Composites

Glass Transition and Interfacial Segmental Dynamics in Polymer-Particle Composites

Analytical Rheology of Polymer Melts: State of the Art

Tube theory of entangled polymer dynamics

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