Premium
Using a polyelectrolyte to fabricate porous polyimide nanoparticles with crater‐like pores
Author(s) -
Zhao Gufan,
Ishizaka Takayuki,
Kasai Hitoshi,
Hasegawa Masatoshi,
Nakanishi Hachiro,
Oikawa Hidetoshi
Publication year - 2009
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1278
Subject(s) - materials science , polyimide , polyelectrolyte , porosity , nanoparticle , chemical engineering , nanometre , thermal stability , solvent , polymer chemistry , polymer , nanotechnology , composite material , layer (electronics) , organic chemistry , chemistry , engineering
We have used the reprecipitation method and subsequent two‐step imidization to fabricate highly porous polyimide (PI) nanoparticles possessing crater‐like surface pores (depths, diameters: tens of nanometers) from poly(amic acid) (PAA) derivatives in the presence of poly(sodium‐4‐styrenesulfonate) (PSS) as a polyelectrolytic porogen. The porous structures arose presumably through segregative microphase separation of PAA and PSS (i.e. repulsion between PAA and PSS in the presence of a common solvent) and subsequent removal of PSS. The addition of this strong polyelectrolyte improved the degree of porosity of the resulting PI nanoparticles and allowed controllable release of the porogen. The resulting porous PI nanoparticles exhibited a high thermal stability (5% weight loss at temperature 450°C). This technique is suitable for the preparation of novel low‐ k materials and their surface‐related applications. Copyright © 2008 John Wiley & Sons, Ltd.