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Nanoparticles of Latexes from Commercial Polystyrene

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Abstract:

Nanoparticles of polystyrene (PS) (Mw = 1.0-3.0 × 106 g/mol) latexes have been successfully prepared from their respective dilute PS (commercial) solutions in cyclohexane, toluene/methanol, or cyclohexane/toluene at each theta temperature. The cationic surfactant cetyltrimethylammonium bromide (CTAB) was used to stabilize the formed PS latex particles. By varying different concentrations of CTAB and PS solution of various Mw, we have successfully produced, for the first time, stable bluish-transparent latex particles ranging from about 10 to 30 nm in diameter (Dw). The number of polymer chains per latex particle (np) is directly proportional to the volume occupied by each latex particle and hence associated to its Dw. The characteristics of these preformed PS latex particles are quite similar to those obtained from the microemulsion polymerization of styrene as reported in literature. These PS latex particles could be further grown by seeding polymerization of styrene to about 50 nm (Dw) with a monodisperse size distribution of Dw/Dn = 1.08.

Keywords: NANOPARTICLES OF LATEXES; POLYSTYRENE SOLUTION; SEEDING POLYMERIZATION OF STYRENE; THETA TEMPERATURE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2002.066

Affiliations: 1: Department of Chemistry, National University of Singapore, Singapore 119260 2: Institute of Materials Research and Engineering (IMRE), Singapore 117602

Publication date: February 1, 2002

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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