Sélection de la langue

Gouvernement du Canada / Government of Canada

Recherche

Rheological evaluation of polystyrene/polyethylene blends

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1002/pen.760282110
AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada
FormatTexte, Article
Résumé
The dynamic shear behavior at 200°C of low density polyethylene, LDPE, polystyrene, PS, and their blends was studied. Two series of blends were prepared containing LDPE:PS = 1:2, 2:1 and 17:3; the first series contained 0, the second 5 wt% of the compatibilizing, partially hydro‐genated poly(styrene‐b‐isoprene) di‐block copolymer, SEB. From the Casson plot the relative values of apparent yield stress were found to be G′y > G″y the addition of SEB decreased both these functions, but the inequality remained valid. After subtracting the yield stress values the frequency relaxation spectrum was computed from the relation G″ = G″(ω). The linear viscoelastic functions determined from the spectrum were found to agree with experimental values within a range of error below 5%. The blends were found to be thermorheologically complex with the time‐temperature shift factors depending on both temperature and frequency. A compositional dissymmetry of blend morphology was observed: PS dispersed in LDPE formed spheres, while at corresponding concentration LDPE in PS formed fibers. A difference in surface tension of the two polymers, leading to different spreading coefficients (SPE/PS≠SPS/PE), or dissymmetry of the interfacial tension coefficient, could provide a possible explanation.
Date de publication
Maison d’éditionWiley
Dans
  • Polymer Engineering and Science 28, nº 21 : 1405–1415.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCCNRC 29101
NRC-IGM88TC-108-753-G
Numéro NPARC23004661
Exporter la noticeExporter en format RIS
Signaler une correctionSignaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement5507c022-e2f0-4293-8787-aefad1a39e5e
Enregistrement créé2018-12-05
Enregistrement modifié2020-03-17
Date de modification :