Interfacial tension reduction in PBT/PE/clay nanocomposite

Hong, J. S., Kim, Y. K., Ahn, K. H., Lee, S. J. and Kim, C. (2007) Interfacial tension reduction in PBT/PE/clay nanocomposite. Rheologica Acta, 46 4: 469-478. doi:10.1007/s00397-006-0123-1

Author Hong, J. S.
Kim, Y. K.
Ahn, K. H.
Lee, S. J.
Kim, C.
Title Interfacial tension reduction in PBT/PE/clay nanocomposite
Journal name Rheologica Acta   Check publisher's open access policy
ISSN 0035-4511
Publication date 2007-01-01
Year available 2006
Sub-type Article (original research)
DOI 10.1007/s00397-006-0123-1
Open Access Status Not yet assessed
Volume 46
Issue 4
Start page 469
End page 478
Total pages 10
Place of publication New York
Publisher Springer
Language eng
Subject C1
Abstract We investigated the effect of organically modified nanoclay (organoclay) on immiscible polymer blends [polybutylene terephthalate (PBT)/polyethylene (PE)] with a special focus on the role of clay as a compatibilizer. When organoclay (Nanofil 919; Sud-Chemie, Inc.) is added to the blend, the clay first locates at the interface and then selectively locates in the PBT phase due to its affinity with PBT. This results in effective size reduction and narrowed size distribution of the dispersed phase. However, with a small amount of organoclay, it is observed that the clay locates at the interface regardless of its affinity for a specific component to minimize the chemical potential. The interfacial tension change of the blend with the addition of organoclay was quantitatively predicted from extensional force measurement. When the blend is subjected to an extension, the interfacial tension functions as a resistance against drop deformation. When we added organoclay to the blend, the extensional force was significantly reduced, which means that the contribution of the interfacial tension to the total force is reduced. For a 10/90 PBT/PE blend, the interfacial tension was reduced from 5.76 to 0.14 cN m(-1) when 1 wt% of organoclay was added. This interfacial tension reduction arises from the localization of the organoclay at the interface and its nonhomogeneous distribution along the interface, suppressing the coalescence between the droplets, which is a role of a compatibilizer. Conclusively, the immiscible polymer blends can be compatibilized with organoclay. The organoclay changes the blend morphology by interfacial tension reduction due to the localization of the organoclay at the interface and by the viscosity ratio change due to the selective localization by its affinity to a specific component in the blend.
Keyword Mechanics
coalescence suppression
interfacial tension
polymer blend
Modified Layered Silicate
Polymer Blends
Methacrylate) Blends
Compatibilization Efficiency
Melt Elongation
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Online in Oct 2006

Document type: Journal Article
Sub-type: Article (original research)
Collections: Journal Article Import (ISI/CVs)
2008 Higher Education Research Data Collection
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Citation counts: TR Web of Science Citation Count  Cited 113 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 121 times in Scopus Article | Citations
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Created: Tue, 19 Feb 2008, 02:21:28 EST