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The effect of anionic clay particles on the structure and thermomechanical behavior of sodium partially‐neutralized EMAA ionomer
Author(s) -
Ardanuy M.,
Velasco J. I.,
RodriguezPerez M. A.,
de Saja J. A.
Publication year - 2010
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.31818
Subject(s) - dynamic mechanical analysis , ionomer , materials science , differential scanning calorimetry , thermal analysis , composite material , thermomechanical analysis , glass transition , transmission electron microscopy , dynamic modulus , polymer chemistry , chemical engineering , polymer , thermal , copolymer , thermal expansion , physics , meteorology , engineering , thermodynamics , nanotechnology
Nanocomposites based on a sodium partially‐neutralized ionomer of poly(ethylene‐ co ‐methacrylic acid) (EMAA) and MgAl layered double hydroxide (LDH) particles with and without organic modification were prepared from a melt mixing process. The structure was characterized using X‐ray diffraction analysis (XRD) and transmission electron microscopy (TEM). Although TEM micrographies revealed the presence of agglomerates of LDH sheets, the achievement of an exfoliated structure was observed when dodecyl sulphate‐modified LDH particles were used. The effects of the LDH particles on the thermomechanical properties of EMAA were analyzed using differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA). The thermal transition of the ionic aggregates and dynamic mechanical response of EMAA were found strongly modified by these particles, resulting in an increase on the storage modulus and a decrease on the loss factor values. Moreover, the alpha relaxation of the composites was visibly shifted to higher temperatures. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010