[Blueboard] Seminar: Core Shell Latex System for Paints

Nina Rosario L. Rojas, Ph.D. nrojas at ateneo.edu
Mon Apr 25 11:32:09 PHT 2005

The Chemistry Department invites you to the 3rd lecture in the Chemistry
Department Seminar Series for Summer Term 2005:


By:  Gilbert U. Yu (M.S. Chemistry, March 2005)
Adviser:  Mr. Jerry T. Dy
Department of Chemistry, Ateneo de Manila University

26 April 2005, Tuesday, 5:30 p.m.
Schmitt Hall CH 109


In this study, a core-shell system based on poly (butyl acrylate (BuA)-
methyl methacrylate (MMA)- methacrylic acid (MAA))- poly (methyl
methacrylate (MMA)) was synthesized based on a modified procedure. The
formulation of the poly (BuA- MMA- MAA) core was also varied by changing
the core composition of the synthesis mixture to form three cores of
different methyl methacrylate (MMA): methacrylic acid (MAA) mole ratios.
The resulting latexes produced opaque white films when dried implying a
core-shell system had been formed. This successful synthesis was also
verified and corroborated by several techniques including infrared
spectroscopy (IR), differential scanning caloriemetry (DSC), and optical
and atomic force microscopy (AFM). True "core-shell" morphology was
proven true when the latexes were reacted with a base such as ammonium
hydroxide (NH4OH) and no swelling occurred. The modification of the
composition of the cores of the various core-shell systems was shown
through the use of IR and DSC experiments. Forced-swelling of the
different latexes by subjecting these with NH4OH at high temperature
resulted in differences in the opacity (absorbance readings) of the said
materials. Optical densitometry results of the study showed increasing
absorbance with increasing methacrylic acid concentration in the core.

Nina Rosario L. Rojas, Ph.D.
Associate Professor
Chair, Department of Chemistry
Ateneo de Manila University
School of Science and Engineering
Loyola Heights, Quezon City
1108 Philippines
Telefax: +63-2-426-1323
Phone: +63-2-426-6001 x5620
nrojas at ateneo.edu

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