The viscosity of polymers and their concentrated solutions

Berry, G. C.; Fox, Thomas

doi:10.1007/bfb0050985

Cited by 814 publications

(188 citation statements)

References 175 publications

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“…At high molar masses, the viscosities of the stars exceeded the ones of their linear counterparts with identical molar mass. Berry and Fox (1968) give an expression for the zero-shear viscosity, describing the viscosity enhancement as an exponential dependence of the zero-shear viscosity on the number of entanglements along the arms. This experimental evidence was also proved for polyisoprene stars by Graessley et al (1976) and underlined by molecular theories (Pearson and Helfand 1984;Ball and McLeish 1989).…”

Section: Viscoelastic Quantities In the Terminal Zonementioning

confidence: 99%

“…For melts of branched molecules, the viscosity decrease due to the smaller radius of gyration caused by branching can be compensated by plotting the zero-shear viscosity g 0 as a function of the intrinsic viscosity [g] H determined in H-solution, i.e., relating the zero-shear viscosity to the similar coil size of linear and branched chains (Roovers 1984;Roovers and Graessley 1981;Berry and Fox 1968). In this work, the intrinsic viscosities of the graft polymers were determined in the good solvent toluene (Haug 2000).…”

Section: Viscoelastic Quantities In the Terminal Zonementioning

confidence: 99%

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Rheological properties of branched polystyrenes: linear viscoelastic behavior

et al. 2005

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Section: Viscoelastic Quantities In the Terminal Zonementioning

confidence: 99%

Section: Viscoelastic Quantities In the Terminal Zonementioning

confidence: 99%

Rheological properties of branched polystyrenes: linear viscoelastic behavior

et al. 2005

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“…19,20,21 Particularly, it has been well established that linear oscillatory shear is sensitive to polymer molecular weight 22,23,24 and cross-linking densities in polymer networks. 18,25,26,27,28 Cross-linked polymers 6 and 7 containing 5% and 10% 3, respectively, were subjected to rheological analysis before and after acid-catalysed hydrolysis using acetic and citric.…”

Section: Rheological Analysismentioning

confidence: 99%

Hydrolytic degradation of ROMP thermosetting materials catalysed by bio-derived acids and enzymes: from networks to linear materials

et al. 2016

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This paper reports the first example of the degradable ROMP thermosetting materials catalysed by bio-derived acids and cutinase from Thermobifida cellulosilytica (Thc_Cut1). The ROMP thermosetting materials are based on norbornene dicarboximides containing acetal ester groups only in the crosslink moiety. The insoluble cross-linked materials were subjected to acid-catalysed hydrolysis using bio-derived acetic and citric acids as well as enzymatic degradation using Thc_Cut1, resulting in the materials becoming completely soluble in dichloromethane.1 H NMR and rheological analysis performed on materials after acid-catalysed hydrolysis showed characteristics indistinguishable to that of the linear polymer analogues. These analyses confirmed the cleavage of the crosslink moiety upon degradation with the main backbone chains remaining intact. The glass transition temperatures of the polymer materials after acid-catalysed hydrolysis were the same of those observed for the linear polymer analogue. TGA showed that the cross-linked polymers thermally stable to 150 °C, beyond which showed weight losses due to the thermal cleavage of the acetal ester linkages.

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“…This viscosity is strongly dependent on the size distributions of the polymer chains. Berry and Fox [27] studied the viscosity of many polymer melts and found that (26) where M w is the weight average molecular weight of the melt and μ e and M e are the entanglement viscosity and molecular weight.…”

Section: Viscositymentioning

confidence: 99%

Pyrolysis and Devolatilization of High-Density Polyethylene

Bruns¹,

Ezekoye²

2011

Fire Safety Science - Proceedings of the 10th International Sym

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A simple model for combined pyrolysis and devolatilization of high-density polyethylene (HDPE) is developed and studied. The model parameters are estimated from available literature data, and the resulting predictions are compared with a single thermogravimetric experiment. It is found that the bubble loss model makes a better prediction than a critical carbon number loss model. As expected, the bubble loss model is seen to lose validity when the sample becomes predominantly composed of volatile species.

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The viscosity of polymers and their concentrated solutions

Cited by 814 publications

References 175 publications

Rheological properties of branched polystyrenes: linear viscoelastic behavior

Rheological properties of branched polystyrenes: linear viscoelastic behavior

Hydrolytic degradation of ROMP thermosetting materials catalysed by bio-derived acids and enzymes: from networks to linear materials

Pyrolysis and Devolatilization of High-Density Polyethylene

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