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Effect of emulsifier type on the copolymerization of styrene and acrylic acid

✍ Scribed by S. Corona-Galvan; A. Martinez-Gomez; J. Castañeda-Perez; J. E. Puig; P. C. Schulz; J. M. Dominguez; A. Ruano

Publisher
Society for Plastic Engineers
Year
1991
Tongue
English
Weight
592 KB
Volume
31
Category
Article
ISSN
0032-3888

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✦ Synopsis

Abstract

In this work we report the emulsion copolymerization of styrene and acrylic acid using a cationic (cetyltrimethylammonium bromide or CTAB) or an anionic (sodium dodecylsulfate or SDS) emulsifier. Latexes were stable and monodisperse with spherical particles of ∼100 nm for the CTAB latex and of ∼70 nm for the SDS latex. However, a random copolymer was produced with CTAB whereas a “blocky” copolymer was obtained with SDS. Here we propose a mechanism to explain these structural differences in terms of the relative reactivities of styrene and acrylic acid and of their initial location and distribution in the SDS and CTAB emulsions.

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