Recent Findings from Johnson & Johnson Provides New Insights into Silicic Acid (Waterborne layered silicate/acrylate nanocomposites by in-situ emulsion polymerization: Thermal and mechanical reinforcement)
By a News Reporter-Staff News Editor at Life Science Weekly -- Current study results on Silicic Acid have been published. According to news reporting out of Jacksonville, Florida, by NewsRx editors, research stated, "Layered silicate acrylateibentonite nanocomposites were synthesized by seeded batch emulsion polymerization. The acrylates were based on butyl acrylate (BA), methyl methacrylate (MMA), and acrylic acid (AA) with composition 56:42:2."
Financial support for this research came from Mexican Council for Science and Technology (see also Silicic Acid).
Our news journalists obtained a quote from the research from Johnson & Johnson, "Surface untreated nanoclay, bentonite, was incorporated in situ up to 3 wt%. Coating films obtained from the aqueous dispersions were optically transparent. Transmission and scanning electron microscopy (TEM, SEM) showed that bentonite was aggregated into clusters dispersed throughout the polymer matrix, and TEM and wide-angle X-ray scattering (WAXS) confirmed that the silicate layers were intercalated by the macromolecules. The nanocomposites exhibited higher onset for thermal degradation temperature, T-onset, and higher glass transition temperature, T-g, increasing up to 20 degrees C and 6 degrees C, respectively, relative to the neat acrylate. Strikingly, the dynamic elastic modulus E' increased over two orders of magnitude at only 3 wt% concentration of bentonite. Furthermore, the et relaxation, denoted by maximum tan 8 (=E'/E') was shifted to higher temperatures and its strength significantly attenuated thus reflecting a decrease in toughening, and evidencing the slowdown of long range molecular motions associated to the glass transition. The mechanical reinforcement was confirmed by uniaxial tensile tests, the Youngis modulus E exhibited a 5-fold increase at only 1 wt% bentonite content."
According to the news editors, the research concluded: "The modification of long range molecular motions evidenced by dynamic mechanical analysis would be associated to the restricted motions of the macromolecules confined within the clay nanoplatelets."
For more information on this research see: Waterborne layered silicate/acrylate nanocomposites by in-situ emulsion polymerization: Thermal and mechanical reinforcement. Progress in Organic Coatings, 2016;101():59-70. Progress in Organic Coatings can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Progress in Organic Coatings - www.journals.elsevier.com/progress-in-organic-coatings/)
Our news journalists report that additional information may be obtained by contacting A. Romo-Uribe, Johnson & Johnson Vis Care Inc, Adv Sci & Technol Div, Jacksonville, FL, United States. Additional authors for this research include K. Santiago-Santiago, G. Zavala-Padilla, A. Reyes-Mayer, M. Calixto-Rodriguez, J.A. Arcos-Casarrubias and J. Baghdachi.
Keywords for this news article include: Jacksonville, Florida, United States, North and Central America, Emerging Technologies, Inorganic Chemicals, Aluminum Silicates, Silicon Compounds, Oxygen Compounds, Silicon Dioxide, Nanotechnology, Acyclic Acids, Nanocomposite, Silicic Acid, Acrylates, Bentonite, Minerals, Oxides, Johnson & Johnson.
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2016, NewsRx LLC