Preparation of styrene/acrylic acid copolymer microspheres: polymerization mechanism and carboxyl group distribution |
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| Authors: | P H Wang C-Y Pan |
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| Institution: | (1) Department of Polymer Science and Engineering, Hefei University of Technology, Hefei Anhui 230009, China, CN;(2) Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei Anhui 230026, China e-mail: pcy@ustc.edu.cn, CN |
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| Abstract: | Poly(styrene-co-acrylic acid) (St/AA) copolymer microspheres were prepared by batch emulsifier-free emulsion copolymerization of St with
AA. The monomer conversion, the morphology and the composition of the particles along the polymerization process were monitored
by a gravimetric method, transmission electron microscopy observation and Fourier transform IR analysis, respectively. A shift
of the polymerization locus from inside the particles to “outside” the particles in the postnucleation stage was proposed.
The results of the study of the distribution of carboxyl groups by a combination of elemental and X-ray photoelectron spectroscopy
analyses implied a core/shell structure for the St/AA copolymer microspheres. By chemical metal deposition, nickel particles
were formed and deposited on the surface of St/AA microspheres, forming polymer/metal composite particles.
Received: 16 February 2001 Accepted: 8 August 2001 |
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| Keywords: | Styrene/acrylic acid copolymer microspheres Polymerization locus Core/shell structure |
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