Effect of molecular weight on preparation of nanoparticles by particle dissolution method from submicron-sized ionized styrene–methacrylic acid copolymer particles in nonionic emulsifier solution
✍ Scribed by M. Okubo; N. Fukami; A. Ito
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 127 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
Styrene-methacrylic acid copolymer [P(S-MAA)] (92/8, molar ratio) nanoparticles were prepared by a dissolution of submicron-sized P(S-MAA) particles with various molecular weights in a polyoxyethylene nonylphenylether nonionic emulsifier aqueous solution at pH 13.0 and above 90ЊC. The latter particles were produced by emulsion copolymerization in the presence of various concentrations of n-octyl mercaptan. The effect of molecular weight on the dissolution behavior was examined at various conditions and using various kinds of the nonionic emulsifier. It was clarified that a decrease in the molecular weight led to the production of the nanoparticles at mild treatment conditions.