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Synthesis and characterization of dual‐functionalized laponite clay for acrylic nanocomposites
Author(s) -
Wang Junzuo,
Wheeler Paul A.,
Jarrett William L.,
Mathias Lon J.
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26763
Subject(s) - silanol , materials science , polymer chemistry , methacrylate , acrylate , methyl methacrylate , nanocomposite , monomer , polymerization , silane , grafting , chemical engineering , polymer , chemistry , composite material , organic chemistry , engineering , catalysis
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 13 C CP/MAS NMR confirmed their structures. Quantitative solid state 29 Si 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 SiOSi 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