Synthesis and Characterization of Dual-Functionalized Laponite Clay for Acrylic Nanocomposites

Document Type

Article

Publication Date

11-5-2007

School

Polymer Science and Engineering

Abstract

Dual‐functional laponites were synthesized by a condensation reaction with silane coupling agents followed by cation exchange reaction with quaternary ammonium salts. FTIR and solid state 13C CP/MAS NMR confirmed their structures. Quantitative solid state 29Si DP/MAS NMR spectra indicated that clay silanol groups reacted with silane coupling agents by a decrease in the silanol peak and appearance of a new SiOSi peak. Dual‐functionalized laponites showed improved dispersion in organic solvents and vinyl monomers. One dual‐functional laponite modified with both photosensitizer and coinitiator photo‐initiated polymerization of an acrylate (2‐phenoxyethyl acrylate, PEA) and a methacrylate (MHMA, methyl α‐hydroxymethylacrylate). TEM showed laponite clay sheets were exfoliated in poly(PEA); while a combination of exfoliated, intercalated and tactoid morphologies was found in poly(methyl α‐hydroxymethylacrylate). The other dual‐functionalized laponite clay with edge‐bound methacrylate units copolymerized with methyl methacrylate and led to a high grafting amount and graft efficiency. PMMA nanocomposites showed higher storage modulus both below and above the glass transition temperature compared to the PMMA control. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

Publication Title

Journal of Applied Polymer Science

Volume

106

Issue

3

First Page

1496

Last Page

1506

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