Special issue dedicated to the 90<sup>th</sup> birthday of Robert N. Haward

Govaert, Leonard Eduard

doi:10.1002/polb.20136

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…The first arises from intermolecular and intramolecular bond stretching, and the second from perturbations of the conformational entropy of an entangled molecular network. The success of this approach in modeling the constitutive behavior of polymers is illustrated not only by the large number of citations, more than 175 to date, but most importantly through the large number of constitutive models, including the one to follow, whose ideas build on those of Haward and Thackray. ,,− But the physical origins of the two sources of stress are also the origins of the sources of birefringence in the glassy polymers of interest in this work.…”

Section: Theorymentioning

confidence: 99%

Prediction of Frozen-In Birefringence in Oriented Glassy Polymers Using a Molecularly Aware Constitutive Model Allowing for Finite Molecular Extensibility

Focatiis

Buckley

2011

Macromolecules

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A study has been made of birefringence in oriented glassy polystyrene. The aim was to develop a methodology for the prediction of birefringence in glassy polymers with frozen-in molecular orientation. The predictive approach employed was to use a recently proposed constitutive model, consisting of a coupling between the Likhtman-Graham Rolie-Poly model for polymer melt rheology and a previously established model for polymer glasses. The methodology was validated with an experimental study of oriented glassy polystyrenes with known melt-stretching histories. It was found that, for orientation processes sufficiently far above T g (i.e., not including subentanglement stretch), birefringence could be predicted accurately in monodisperse materials.

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