Interaction of Polymers with Nitric Oxide

Nitric oxide (NO) has a key role in many bioregulatory systems, including immune stimulation, platelet inhibition, neurotransmission, and relaxation of smooth muscle [1]. Its biosynthesis derives from nitric oxide synthases which catalyse the conversion of L-arginine to L-citrulline, resulting in NO release. Among the proposed NO storage components are protein-bound thionitrosyls and protein-bound dinitrosyl iron complexes (DNIC) [2,3]. The latter are derived from iron-sulphur 

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Interaction of Polymers with Nitric Oxide macromolecules with methoxycarbonyl radicals ... 

This chapter is devoted to a consideration of the results obtained in studies of the interactions of nitrogen oxides with polymers. There are eight nitrogen oxides, but only NO, NO2 and N-,04 are actually important as pollutants. Nitric oxide (NO) exists as a free radical, but it is reasonably stable in reactions with organic compounds. The paramagnetic nitrogen dioxide (NO2) is more active compared with NO. This gas is universally present in equilibrium with its dimer molecule ... 

The loss of plasticizer may be accelerated by the decomposition of cellulose nitrate which produces nitrous oxides that then combine with water to form nitrous and nitric acids. Acids affect the stability of plasticizers and their interaction with the polymer. 

The surface of carbon fibers is usually oxidized to increase the adhesion with the resin matrix. Oxidizing treatments include wet chemical treatments with sodium hypochlorite or nitric acid. Such treatments generally produce two effects with epoxy resins first, an outer, defect-laden fiber surface layer is removed second, surface oxygen groups are added, which can interact with the resin matrix. In addition to oxidative surface treatments, there may be surface treatment with finishes or sizings to enhance compatibility of the fibers with the polymer matrix. 

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