Aromatic poly(oxadiazole)s ‐ new aspects of their synthesis, structures and properties

Abstract

Aromatic poly(oxadiazole)s are a class of heterocyclic polymers that show excellent thermal and chemical stability. Also, their electrical and optoelectrical properties are of interest. Here, a short review is given about recent results in the field of aromatic poly(oxadiazole)s elaborated in our research groups that emerged from the former Institute of Polymer Chemistry in Teltow‐Seehof. New aspects are described regarding the technology of poly(oxadiazole) synthesis via the oleum route. In detail the structures of poly(p‐phenylene‐1,3,4‐oxadiazole) in solution as well as in solid state are described. Moreover, the electrochemical behaviour and the dynamic‐mechanical properties are discussed.

A survey on the distant activity of short period comets

“…In this section we will present one example of the study of SPC dynamical evolution: the comet 67P/Churyumov-Gerasimenko, particularly interesting for its role as a target for the ongoing Rosetta ESA space mission (Schwehm & Schulz 1999;Schulz 2009), launched on March 2004 and presently on its way to the target, to be reached in 2014. Comet 67P/Churyumov-Gerasimenko (hereafter 67P) was discovered by K. I. Churyumov and S. I. Gerasimenko in mid-1969, on photographic plates taken at the Alma-Ata Astrophysical Institute (see Churyumov 2004).…”

“…In the future, the Rosetta mission (Schwehm & Schulz 1999;Schulz 2009), launched in 2004, will reach the comet 67P/ChuryumovGerasimenko and extensively study its nucleus and the onset of its cometary activity. The majority of cometary nuclei studies comes from direct imaging (from ground and/or space telescopes), when the comet is at large heliocentric distance r h and so it is presumably inactive.…”

Synthesis and Properties of Novel Cardo Aromatic Poly(ether oxadiazole)s and Poly(ether-amide oxadiazole)s

“…Moreover, it was found that most of the oxadiazole polymers were also soluble in the solvent system consisting of a nitroalkane and a Lewis acid, such as nitromethane containing 10 wt.-% AlCl 3 , similar to the results reported in literature. [30] This is an indication that interactions may exist between the nitrogen atoms of the oxadiazole ring and the Lewis acid. Table 1, all the hydrazide polymers except 3 a could be solution-cast into flexible and creasable films.…”

Synthesis and Properties of Novel Cardo Aromatic Poly(ether oxadiazole)s and Poly(ether-amide oxadiazole)s

“…Moreover, it was found that most of the oxadiazole polymers were also soluble in the solvent system consisting of a nitroalkane and a Lewis acid, such as nitromethane containing 10 wt.-% AlCl 3 , similar to the results reported in literature. [30] This is an indication that interactions may exist between the nitrogen atoms of the oxadiazole ring and the Lewis acid. As described in Table 1, all the hydrazide polymers except 3 a could be solution-cast into flexible and creasable films.…”