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Soft polymer and nano-clay supracolloidal particles in adhesives : synergistic effects on mechanical properties
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Wang, Tao, Colver, Patrick J., Bon, Stefan Antonius Franciscus and Keddie, Joseph L. (2009) Soft polymer and nano-clay supracolloidal particles in adhesives : synergistic effects on mechanical properties. Soft Matter, Vol.5 (No.20). pp. 3842-3849. doi:10.1039/b904740a ISSN 1744-683X.
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Official URL: http://dx.doi.org/10.1039/b904740a
Abstract
Numerous synthesis routes toward nanostructured polymer particles have emerged, but few examples demonstrate the essential need for such complex particle structures to achieve any added benefit in a target application. Here, polymer particles having Laponite clay armor were prepared by the Pickering miniemulsion polymerization of n-lauryl acrylate. The resulting "soft-hard'' poly(lauryl acrylate) (PLA) -Laponite hybrid particles were blended at various low concentrations with a standard poly(butyl acrylate-co-acrylic acid) (PBA) latex for application as a waterborne pressure-sensitive adhesive (PSA). The tack adhesion properties of the resulting nanocomposite films were compared with the performance of the PBA when blended with either a conventional non-armored PLA latex, with Laponite RD nanosized clay discs, or a mixture of both. A true synergistic effect was discovered showing that the clay-armored supracolloidal structure of the hybrid particles was essential to achieve a superior balance of viscoelastic properties. The addition of small amounts, e. g. 2.7 wt%, of the "soft-hard'' clay-armored PLA particles increased the tack adhesion energy considerably more than found for the two individual components or for the sum of their individual contributions. The soft PLA core ensures that the adhesives are not stiffened too much by the nanosized Laponite clay. Slippage at the interface between the nanoclay platelets and the PBA matrix introduces an additional energy dissipation mechanism during deformation. Through the synergistic effect of the clay and PLA in the supracolloidal armored latex structure, the tack adhesion energy is increased by 45 J m(-2), which is about 70% greater than found for the PBA adhesive alone.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Nanostructured materials, Emulsion polymerization, Pressure-sensitive adhesives, Polymer clay, Polymer clay -- Barrier properties, Colloids | ||||
| Journal or Publication Title: | Soft Matter | ||||
| Publisher: | Royal Society of Chemistry | ||||
| ISSN: | 1744-683X | ||||
| Official Date: | 21 October 2009 | ||||
| Dates: |
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| Volume: | Vol.5 | ||||
| Number: | No.20 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 3842-3849 | ||||
| DOI: | 10.1039/b904740a | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Universities UK, University of Surrey |
Data sourced from Thomson Reuters' Web of Knowledge
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