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One step polymerization of [2-(methacryloyloxy)-ethyl trimethyl ammonium chloride] (METAC) onto the surface of silicon dioxide nanopowder (SDNP) has been carried out to achieve quaternized polymer/nano-Silicon Dioxide composite. Various aspects of a quaternized polymer (such as anion selectivity, ion exchange capacity, biocompatibility and antibacterial activity) have been evaluated for the possible applications in analytical and biomedical fields. The composite has been characterized by FTIR, TGA, TEM, and chemical and biochemical analysis. The role of SDNP in polymerizing METAC has been elucidated. The core-shell structure of the composite favors chromate selectivity and desireable bioactivity.

Quaternized polymer and its nanocomposite with Silicon Dioxide have attracted potential research interest recently for their widespread application in many fields such as analytical chemistry (ion exchange separation, chromatographic sorbents, and industrial wastewater purification), biomedical research (humidity sensor, gene therapy), catalysis (phase transfer catalyst) and polymeric surfactant (production and stabilization of metal nanoparticles).

By tetraethyl orthosilicate (TEOS) in a polyamic acid (PAA) of N, N 'catch methylacetamide (DMAc) solution of a sol-gel material prepared by the reaction of the different Silicon Dioxide contents polyimide / silica (PI / SiO2) composite film material. Less than 10wt% silica content sample was transparent light yellow film; silica content of greater than 10wt% of the samples were opaque brown film. Tested by infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis, dynamic mechanical analysis, thermal expansion coefficient, results show, PI / SiO2 nanocomposites polyimide having relatively higher thermal stability and higher modulus; linear expansion coefficient significantly reduce; tensile strength and elongation at break with the silica content changes were a maximum value in the vicinity of 10wt% and 30wt%.



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