Fabrication of polyimide microspheres with high precursor polymer concentration

Author

Jianjun Lu ; Xiaoxia Zhang ; Miaoqing Liu ; Li Chen ; Xingnan Li ; Huimin Li ; Peitong Xie ; Li Lin

Author_Institution

Key Lab. of Coal Sci. & Technol., Taiyuan Univ. of Technol., Taiyuan, China

Volume

6

Issue

4

fYear

2011

fDate

4/1/2011 12:00:00 AM

Firstpage

236

Lastpage

239

Abstract

Polyimide (PI) microspheres with high precursor polymer concentration were successfully prepared using non-aqueous reverse emulsion polymerisation. The emulsion was composed of N, N-dimethyl formamide and liquid paraffin, in which Span85 was used as surfactant. The effect of Span85 concentration on the resulting PI product has been investigated. The results indicated that with the increase in Span85 concentration, the average diameter declined, and the size distribution became narrow. When the concentration of surfactant Span85 was around 0.15 w/w, a yellow-to-brown-coloured powder of PI microfine spheres was obtained, with an average particle size of 25.6 m. As an emulsifier and a chain termination agent, surfactant Span85 chemically bonded to the growing polymer chains, and not only formed stable non-aqueous inverse emulsion but also increased precursor polymer concentration.

Keywords

emulsions; materials preparation; particle size; polymerisation; polymers; N, N-dimethyl formamide and liquid; chain termination agent; emulsifier; emulsion; high precursor polymer concentration; liquid paraffin; nonaqueous reverse emulsion polymerisation; particle size; polyimide microspheres; surfactant; yellow-to-brown-coloured powder;

fLanguage

English

Journal_Title

Micro & Nano Letters, IET

Publisher

iet

ISSN

1750-0443

Type

jour

DOI

10.1049/mnl.2010.0236

Filename

5771632