TY - JOUR
AU - Herk, Alex
AB - This paper demonstrates that a covalent bonding between clay platelets and polymer chains is not necessary for a successful encapsulation of the inorganic compounds through emulsion polymerization. In the work described in this paper, the chemical modification of clay was performed using two kinds of titanate coupling agents: titanium IV, (2-propanolato)tris(2-propanoata-O), 2-(2-methoxyethoxy) ethanol and titanium IV, 2-propanolato,tris(isooctadecanoato-O), where the former is saturated and the second has unsaturated alkyl groups. The hydrolytic stability of the organoclays thus synthesized was thereafter investigated. It was found that the titanate modifiers were highly sensitive towards hydrolysis as evidenced by Fourier transform infrared and thermal gravimetry analyses. The effect of a chemical modification step on clay encapsulation was studied by comparing the results obtained between reactions using the synthesized organoclays and the ones using native clay platelets. It was found that the incorporation of polymerizable double bonds on clay platelets was unnecessary to achieve successful encapsulation and that, surprisingly, the chemical modification step could be omitted for the synthesis of clay-containing latex particles. The effects of monomer feed composition, i.e., monomer mixtures consisting of different weight ratios methyl methacrylate/butyl acrylate, and process types on clay encapsulation were also investigated. Both parameters were found to have a strong influence on clay encapsulation. Finally, the surfactant concentration and the surfactant type were statistically found to have a significant effect on the clay/polymer interaction as evidenced by the results of glass transition temperatures of dried latex/clay nanocomposites powders.
TI - Encapsulation of non-chemically modified montmorillonite clay platelets via emulsion polymerization
JF - Colloid  Polymer Science
DO - 10.1007/s00396-012-2732-9
DA - 2012-07-22
UR - https://www.deepdyve.com/lp/springer-journals/encapsulation-of-non-chemically-modified-montmorillonite-clay-r6u3pU1mxj
SP - 501
EP - 513
VL - 291
IS - 3
DP - DeepDyve
ER -