NEW RESULTS REGARDING THE MICRO/NANO/BIOAPPLICATIONS OF SOME NATURAL OR SYNTHETIC POLYMERS
G. C. CHITANU, G. MOCANU, E. C. BURUIANA, L. SACARESCU

Abstract. Recent results concerning the use of new synthetic or functionalized natural polymers for nano/bio/applications are presented. The first chapter presents novel polysaccharide microparticles obtained from pullulan and carboxymethylpullulan by using a new crosslinking agent – [3-(glycidoxypropyl) trimethoxysilane]. They presented interesting properties of interaction with biologically active substances, which recommend them as supports for controlled release drug systems. The second chapter gathers the newest results on the synthesis of NLO-molecules build on polysilane structures enclosing various electro-active groups. The structural influence of the Si-H functionality on the low temperature restructuration processes is discussed in relation with the electronic spectrum profile and fluorescence properties. Further, new polysilanemetal complexes structures were obtained by the polycondensation reaction of α,ω- bis(chloromethyl)-polymethylphenylsilane with the Ni (II) complex of bis(salicylidene) ethylenediamine. The chloro-functionalized polysilane was obtained by a modified Wurtz coupling procedure at low temperatures. To obtain the polymer-metal complex the resulted macroligand was complexed with metal cations. This structure is characterized by a highly localized electro-activity in the redox moiety combined with a specific ? conjugative effect in the polysilane chain. UV-VIS and FL spectral analyses as were used to investigate the optical properties of the polysilanes in relation with their chemical structure.
The paper present also results regarding the biomedical applications of maleic copolymers and polyacrylates with photosensitive groups, that outline new applications fields for the polymers in nanotechnology.