Poly inorganic-organic polymers

Poly(siloxanes) are inorganic-organic polymers that have a backbone formed from alternating oxygen and silicon atoms of the form l-o-si-] . Various substituents are... 

In the past 30 years, since H. Hoegl discovered photoconductivity in the organic polymer poly(N-vinylcarbazole) (PVK) (Fig. 1.2) [5, 6], organic materials have almost completely replaced their inorganic counterparts, although the effective mobility in these systems is typically 5 orders of magnitude lower as compared to a-Se. 

Other organic—inorganic hybrids include poly(ethyloxazoline)—siUca, poly(vinyl alcohol)—siUca, poly(arylene ether) ketone—siUca, polyimide—siUca, polyozoline—sihca, poly(ethylene oxide)—siUca, and polymers—modified alkoxysilane. 

Three approaches have been tested, as already described above for inorganic supports. The first attempts concern the direct reaction of transition metal carbonyls with unmodified organic polymers like poly-2-vinyl-pyridine.61 62 However, this kind of anchoring is restricted to only a few complexes. Various polymers have been functionalized with donor groups 63-72 ligand displacement reactions using these afforded the corresponding immobilized complexes. Finally, tests with modified complexes and unmodified polymers are scarce because of the low stability of these complexes under the conditions of reactions. 

Matyjaszewski, K. Miller, P. J. Kickelbick, G. Nakagawa, Y. Diamanti, S. Pacis, C. Organic-Inorganic Hybrid Polymers from Atom Transfer Radical Polymerization and Poly(dimethylsiloxane). In Silicones and Silicone-Modified Materials Clarson, S. J., Fitzgerald, J. J., Owen, M. J., Smith, S. D., Eds. ACS Symposium Series 729 American Chemical Society Washington, DC, 2000 pp 270-283. 

They are fabricated from a variety of inorganic, organic, and naturally occurring materials and generally contain pores that are greater than 50—100 A in diameter. Materials such as nonwoven fibers (e.g. nylon, cotton, polyesters, glass), polymer films (e.g. polyethylene (PE), polypropylene (PP), poly(tetrafluo-roethylene) (PTFE), poly (vinyl chloride) (PVC)), and naturally occurring substances (e.g. rubber, asbestos, wood) have been used for microporous separators in batteries that operate at ambient and low temperatures (<100 °C). The microporous polyolefins (PP, PE, or laminates of PP and PE) are widely used in lithium based nonaqueous batteries (section 6.1), and filled polyethylene separators in lead-acid batteries (section 7.3), respectively. 

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