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Rheologica Acta

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03.08.2017 | Original Contribution

Theoretical correlation of linear and non-linear rheological symptoms of long-chain branching in polyethylenes irradiated by electron beam at relatively low doses

verfasst von: Mehdi Entezam, Mahdi Abbasi, Mostafa Ahmadi

Erschienen in: Rheologica Acta | Ausgabe 9/2017

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Abstract

Dynamic and transient shear and elongation flow experiments along with gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) analysis are performed on linear low-density polyethylenes (LLDPEs) irradiated at doses below 25 kGy. GPC data indicate no changes in the molar mass distribution, and there are almost no changes in melt and crystallization temperatures, likewise. Contrary, dynamic shear rheological behavior including thermorheological complexity, type of reduced van Gurp-Palmen curves, and zero shear-rate viscosities all disclose growing levels of long-chain branching with irradiation dose. An inverse tube model is developed for binary blend of linear and star chains and used to extract the fraction of the branched components. Modeling results reveal progressive increase in the length and fraction of star chains, as evidenced by appearance of an anomalous double overshoot in the transient shear viscosities. Detection of strain hardening in extensional stress growth coefficient data, well-quantified by molecular stress function model, is also in agreement with the predictions of tube model.

Vorheriger Artikel The transition between undiluted and oligomer-diluted states of nearly monodisperse polystyrenes in extensional flow

Nächster Artikel Influence of pre-shearing on rheometric measurements of an oil-based drilling fluid

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Titel: Theoretical correlation of linear and non-linear rheological symptoms of long-chain branching in polyethylenes irradiated by electron beam at relatively low doses
verfasst von: Mehdi Entezam
Mahdi Abbasi
Mostafa Ahmadi
Publikationsdatum: 03.08.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: Rheologica Acta / Ausgabe 9/2017
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-017-1029-9

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