Titelangaben
Chen, Yiwang ; Wang, Wencai ; Yu, Weihong ; Yuan, Zeliang ; Kang, En-Tang ; Neoh, Koon-Gee ; Krauter, Berit ; Greiner, Andreas:
Nanoporous low-κ polyimide films via poly(amic acid)s with grafted poly(ethylene glycol) side chains from a reversible addition-fragmentation chain-transfer-mediated process.
In: Advanced Functional Materials.
Bd. 14
(2004)
Heft 5
.
- S. 471-478.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.200305050
Abstract
Thermally-initiated living radical graft polymerization of poly(ethylene glycol) methyl ether methacrylate (PEGMA) with ozone-pretreated polyN,N'-(1,4-phenylene)-3,3',4,4'-benzophenonetetra-carboxylic amic acid] (PAmA) via a reversible addition-fragmentation chain-transfer (RAFT)-mediated process was carried out. The chemical compositions and structures of the copolymers were characterized by nuclear magnetic resonance (NMR) spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and molecular weight measurements. The ``living'' character of the grafted PEGMA side chains was ascertained in the subsequent extension of the PEGMA side chains. Nanoporous low-dielectric-constant (IOW-K) polyimide (PI) films were prepared by thermal imidization of the PAmA graft copolymers under reduced argon pressure, followed by thermal decomposition of the side chains in air. The nanoporous PI films obtained from the RAFT-mediated graft copolymers had well-preserved PI backbones, porosity in the range of 5-17%, and pore size in the range of 30-50 nm. The pores were smaller and the pore-size distribution more uniform than those of the corresponding nanoporous PI films obtained via graft copolymers from conventional free-radical processes. Dielectric constants approaching 2 were obtained for the nanoporous PI films prepared from the RAFT-mediated graft copolymers.
Weitere Angaben
Publikationsform: | Artikel in einer Zeitschrift |
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Begutachteter Beitrag: | Ja |
Keywords: | FREE-RADICAL POLYMERIZATION; RAFT POLYMERIZATION; OZONIZED POLYETHYLENE; SURFACE MODIFICATION; COPOLYMERS; POLYMERS; NANOCOMPOSITES |
Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II > Lehrstuhl Makromolekulare Chemie II - Univ.-Prof. Dr. Andreas Greiner Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Makromolekulare Chemie II |
Titel an der UBT entstanden: | Nein |
Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
Eingestellt am: | 08 Apr 2015 13:12 |
Letzte Änderung: | 24 Okt 2023 13:46 |
URI: | https://eref.uni-bayreuth.de/id/eprint/9713 |