Abstract
A discussion of various strategies for the intrazeolite encapsulation of polymer filaments is given. Two examples are discussed in more detail: Poly(2-ethylaniline) and pyrolyzed polyacrylonitrile in zeolite hosts. Poly(2-ethylaniline) chains were synthesized within the three-dimensional channels of dehydrated zeolites X and Y via oxidation of the intrazeolite monomers with aqueous (NH4)2S2O8. The steric demands for the polymerization are illustrated by the inability of the polymer to form in the one-dimensional channel system of mordenite. Since protons are not necessary for the polymerization to occur, the polymer is formed in the acid form of the zeolites as well as in the Na-forms. The intrazeolite polymer chain length peaks at about 0.1 μm (determined from gel permeation chromatography), and is greater than that obtained in bulk polymerizations. Intrazeolite polyacrylonitrile (PAN) was formed from preadsorbed acrylonitrile in zeolite Y and mordenite on reaction with radical initiators. Chain length analysis with gel permeation chromatography revealed a peak molecular weight of 19,000 for PAN in NaY, and about 1,000 for the polymer in mordenite. When intrazeolite PAN was pyrolyzed under nitrogen, black encapsulated material resulted that had lost the nitrile groups and hydrogen. After removal from the zeolite hosts, the pyrolyzed polyacrylonitrile showed electronic DC conductivity at the order of 10−5 Scm−1.
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Bein, T., Enzel, P. (1993). Inclusion of Conducting Polymers in Inorganic Hosts: Towards Conducting Nanostructures. In: Aldissi, M. (eds) Intrinsically Conducting Polymers: An Emerging Technology. NATO ASI Series, vol 246. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1952-0_6
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DOI: https://doi.org/10.1007/978-94-017-1952-0_6
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