Poly germane

Polysilylenes and polygermylenes (also described as polysilanes and poly-germanes) are linear a-bonded Si or Ge polymers that contain a variety of C-based pendant groups. For charge transport, the role of the pendants is secondary and transport occurs by hopping between ordered main-chain segments between 15 to 30 repeat units separated by disordered links (Abkowitz and Stolka, 1988, 1988a, 1996). 

Table 15.2 Some properties of a methyl methacrylate-acrylonitrile copolymer compared with a general purpose poly(methyl methacrylate) compound at 23°C and 50% R.H (German DIN tests)...

Poly(vinyl pyrrolidone) (PVP) was introduced by the Germans in World War II as a blood plasma substitute.A water-soluble polymer, its main value is due to its ability to form loose addition compounds with many substances. 

Acrylic acid, the main precursor to acrylic adhesives had been synthesized in the mid 1800s and the first acrylic acid esters were made and characterized at the turn of the century [62]. The first commercial launch of acrylic polymers in the form of poly(methylmethacrylate) took place in 1927 when the German company Rohm and Haas AG introduced this new plastic to the market. Soon after, other companies such as BASF introduced acrylic dispersions. 

H. Spreitzer, W. Kreuder, H. Becker, H. Schoo, and R. Demandt, Aryl-Substituted Poly(p-Arylene Vinylenes), Method for the Production and Use Thereof in Electroluminescent Components, PCT Patent Appl. WO 98/27136, June 25, 1998 (in German). 

A paper on The rheological properties of poly(fluorophenylene germane) dendrimers was published by Myasnikova and co-workers in the Russian journal Polym. Sci., Ser. 

Carl Auer, Baron von Welsbach, was bom on September 1, 1858, at Vienna (4). After completing the courses at the gymnasium and Poly-technicum of his native city, he went to Heidelberg to study under Robert Bunsen. The quiet, industrious, unsociable boy from Austria soon became a favorite of the great German master. Auer was deeply interested in inorganic chemistry, and especially in minerals. The rare earth minerals of the north attracted him so much that he began to search for specimens. 

Poly(isobutylene) (PIB) is the earliest polyolefin that has been produced on a technical scale. A German patent was filed in 1931 (1), which was eventually published in 1937. Other patents followed (2). In 1938 PIB was marketed as Oppanol B by BASF. Oppau is a district of Ludwigshafen (3). 

Some simple organometallics have been studied. Poly(silanes) and germanes exhibit very interesting behavior, since they are photochromic and appear to possess excitonic, charge delocalized excited states involving the sigma electrons of the organometallic backbone. 112) THG measured susceptibilities of up to 1 x... 

The anionic polymerization of tris(pentafluorophenyl)germanium halide (49) was reported by Bochkarev et alJ58 to give Ge-based polymers (50 Scheme 6.14), a 9-Cascade germane[3] (2,3,5,6-tetrafluorogermanylidyne) pentafluorobenzene. These poly-... 

TABLE 1. Representative examples for the preparation of poly(dialkyl)germanes by Wurtz-type coupling31,32... 

In solution, the UV absorption characteristics of polygermanes may be different from those in the solid state. Poly(dihexyl)germane in solution has a kmax value of 327 nm, whereas the same polymer fraction deposited as a thin film on a quartz plate exhibits two... 

---