Formation mechanism of micron-sized monodispersed polymer particles having a hollow structure |
| |
Authors: | M Okubo H Minami |
| |
Institution: | (1) Department of Chemical Science and Engineering Faculty of Engineering Kobe University Rokko, Nada, Kobe 657, Japan, JP |
| |
Abstract: | Recently, the authors reported that micron-sized monodispersed cross-linked polymer particles having a single hollow in the
inside were produced by seeded polymerization for the dispersion of (toluene/divinylbenzene)-swollen polystyrene (PS) particles
prepared utilizing the dynamic swelling method which the authors had proposed. In this article, the particles at various conversions
of the seeded polymerization were observed with an optical microscope in detail. From the obtained results, the formation
mechanism of the hollow structure is suggested as follows. As seeded polymerization proceeds, poly-divinylbenzene (PDVB) molecules
precipitated in the swollen particle are trapped near the interface and gradually pile at the inner surface, which results
in a cross-linked PDVB shell. PS which dissolves in the swollen particles is repelled gradually to the inside. After the completion
of the polymerization, toluene in the hollow evaporates by drying, and PS clings to the inner wall of the shell uniformly.
Received: 14 February 1997 Accepted: 16 April 1997 |
| |
Keywords: | Dynamic swelling method hollow micron-size monodisperse cross-linking formation mechanism |
本文献已被 SpringerLink 等数据库收录! |
|