Decomposition structural polymers, organism

The preparation of porous hollow silica nanoparticles for a drug delivery applications was described by Chen et al. The authors used the time release profile of cefradine as a test example. Caruso et al. " prepared hollow silica spheres and silica-polymer layered composite spheres. A controlled pore structure remained after decomposition of the organic material and possible applications in medical and pharmaceutical applications are described in their publication. Another drug release example was described by Chamay et al., ° who incorporated ibuprofen, a well... 

The polymerization proceeds under photo- [49,50],X-ray [51], and y-ray [52] irradiation in the dark in vacuo, in air, or even in water or organic solvent as the dispersant (nonsolvent) for the crystals, similar to the solid-state polymerization of diacetylene compounds [ 12]. The process of topochemical polymerization of 1,3-diene monomers is also independent of the environment surrounding the crystals. Recently, the thermally induced topochemical polymerization of several monomers with a high decomposition and melting point was confirmed [53]. The polymer yield increases as the reaction temperature increases during the thermal polymerization. IR and NMR spectroscopies certified that the polymers obtained from the thermally induced polymerization in the dark have a stereoregular repeating structure identical to those of the photopolymers produced by UV or y-ray irradiation. 

The use of PLD to deposit these materials is complicated by the fact that their structures cannot be subjected to a laser-induced pyrolyhc decomposition and re-polymerizahon process that works for addition polymers. In fact, the perfect reconstruction upon deposition of the organic molecular structures for these materials is never observed once ablated at laser fluences higher than their ablation threshold. However, PLD is possible at laser fluences near the ablahon thresholds of these materials and some examples are given next. 

In oxidation and dehydrogenation correlations were found with the redox properties of the solid. In the decomposition of nitrous oxide the paramagnetic properties, and with them, the catalytic activity, of organic polymers could be changed at will by modifications in the polymer structure, and in acid catalysis activity could be regulated by changing the type of acidic group and by selective neutralization. 

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