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