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Dual phase continuity in polymer blends

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1002/masy.19910480117
AuthorSearch for: ; Search for: 1
Affiliation
  1. National Research Council of Canada. NRC Industrial Materials Institute
FormatText, Article
Abstract
The literature on formation of immiscible polymer blends with dual phase continuity is shortly reviewed. When the volume fraction of one phase is low, nearly spherical discrete domains may be formed in flow fields. The critical volume fraction for formation of infinite structures: φcr = 0.156, predicted by percolation theory for monodisperse spherical domains, is in reasonable accordance with experimental data for samples with spherical domains. In simple shear flow and low volume fraction the coalescence and break up processes may lead to the coexistence of long nearly cylindrical domains (large) oriented in the flow direction and (small) spherical domains. A hypothesis predicting a decrease of the percolation threshold value when φL* · φS* · P · 4 is large, is shown to be in accordance with experimental observations. φL* and φS* are the relative volume fraction of large and small domains, respectively, and P is the aspect ratio of the elongated (cylindrical) drops. The applicability of general (scaling) relations based on percolation theory are discussed.
Publication date
PublisherWiley
In
  • Makromolekulare Chemie. Macromolecular Symposia 48-49, no. 1: 189–209.
LanguageEnglish
Peer reviewedYes
NRC numberCNRC 34353
NRC-IMI92AP-30200-1334-G
NPARC number23004683
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Record identifier9fb85a16-f064-4794-a176-759c3ac2cca8
Record created2018-12-10
Record modified2020-03-17
Date modified: