Interfacial tension reduction in PBT/PE/clay nanocomposite

Joung Sook Hong, Yong Kyung Kim, Kyung Hyun Ahn, Seung Jong Lee, Chongyoup Kim

Research output: Contribution to journalArticle

132 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)469-478
Number of pages10
JournalRheologica Acta
Volume46
Issue number4
DOIs
Publication statusPublished - 2007 Mar 1

Fingerprint

polyethylene terephthalate
Polyethylene
Polyethylene terephthalates
clays
Surface tension
Nanocomposites
nanocomposites
interfacial tension
Clay
Compatibilizers
affinity
terephthalate
Polymer blends
polymer blends
Force measurement
Chemical potential
Coalescence
clay
poly(1,4-butylene terephthalate)
coalescing

Keywords

  • Coalescence suppression
  • Compatibilization
  • Interfacial tension
  • Morphology
  • Polymer blend

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics

Cite this

Interfacial tension reduction in PBT/PE/clay nanocomposite. / Hong, Joung Sook; Kim, Yong Kyung; Ahn, Kyung Hyun; Lee, Seung Jong; Kim, Chongyoup.

In: Rheologica Acta, Vol. 46, No. 4, 01.03.2007, p. 469-478.

Research output: Contribution to journalArticle

Hong, Joung Sook ; Kim, Yong Kyung ; Ahn, Kyung Hyun ; Lee, Seung Jong ; Kim, Chongyoup. / Interfacial tension reduction in PBT/PE/clay nanocomposite. In: Rheologica Acta. 2007 ; Vol. 46, No. 4. pp. 469-478.
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