Grafting of polymer matrix to exfoliated montmorillonite nanoplatelets in nanocomposite film cast from soap-free emulsion polymerized latex and its fortified mechanical properties

Poly(methyl acrylate-co-methyl methacrylate) [P(MA-co-MMA)] nanocomposite film containing 1 wt % of montmorillonite (MMT) exhibited unusual higher ductility, higher strain recovery ratio after creep, and higher modulus and strength compared to neat P(MA-co-MMA) as they were cast from their individua...

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Bibliographic Details
Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2009-11, Vol.47 (21), p.5891-5897
Main Authors: Lin, Keng-Jen, Weng, Ting Hsiang, Lee, Chia-Hsin, Lin, King-Fu
Format: Article
Language:English
Subjects:
Applied sciences
clay
Composites
Emulsion polymerization
Exact sciences and technology
Exfoliation
Forms of application and semi-finished materials
Grafting
Mechanical properties
Montmorillonite
nanoclay
nanocomposite
Nanocomposites
Nanomaterials
Nanostructure
Polymer industry, paints, wood
Technology of polymers
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Summary:Poly(methyl acrylate-co-methyl methacrylate) [P(MA-co-MMA)] nanocomposite film containing 1 wt % of montmorillonite (MMT) exhibited unusual higher ductility, higher strain recovery ratio after creep, and higher modulus and strength compared to neat P(MA-co-MMA) as they were cast from their individual latices fabricated by soap-free emulsion polymerization. The fortified mechanical properties were attributed to the MgO components of exfoliated MMT nanoplatelets being grafted by P(MA-co-MMA) chains as verified by FTIR and XPS spectroscopies, which to the best of our knowledge is the first time in the literature providing the direct evidence for the polymer chains grafting onto the exfoliated MMT. TEM investigation of the stretched nanocomposite film revealed that the microcracks in the nanocomposite film appeared mainly in the bulk region of polymer matrix, implying that the interfacial strength between P(MA-co-MMA) and its grafted MMT nanoplatelets was higher than the cohesion strength of P(MA-co-MMA).
ISSN:0887-624X
1099-0518
1099-0518
DOI:10.1002/pola.23634