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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

Title data

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. Vol. 14 (May 2004) Issue 5 . - pp. 471-478.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.200305050

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: FREE-RADICAL POLYMERIZATION; RAFT POLYMERIZATION; OZONIZED POLYETHYLENE; SURFACE MODIFICATION; COPOLYMERS; POLYMERS; NANOCOMPOSITES
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 08 Apr 2015 13:12
Last Modified: 08 Apr 2015 13:12
URI: https://eref.uni-bayreuth.de/id/eprint/9713