Synthesis And Characterization Of Nano Silver (Gallium)/P(DMAEMA-AMPS) Composites

Polymer-based metal composites has been an extremely important role in the current nanomaterials research due to their special properties, such as sensing properties, optical properties, catalytic properties, electromagnetic properties and so on. The polymer matrix may be hydrogel with a three-dimensional network structure or powder with random copolymer stucture.(1)With2-(Dimethylamino)ethyl methacrylate (DMAEMA) and2-Acrylamide-2-methylpropanesulfonic acidas (AMPS) as monomers, polyethylene glycol400(PEG400) as the pore-forming agent, N,N’-Methylenebisacrylamide (BIS) as cross-linking agent, nano-silver/P(DMAEMA-g-AMPS) hydrogels were prepared by ultraviolet irradiating, in which Ag+ions were reduced and composited with polymers. The microscopic structure, the interaction between nanoparticles and polymer matrix were characterized by various techniques including FT-IR, XRD, XPS, SEM and TEM. The results showed that silver nanoparticles displayed a face-centered cubic crystal structure with the length of50nm or less in diameter were dispersed highly and homogeneously in P(DMAEMA-g-AMPS) matrix which was three-dimensional network structure due to the coordination effect between nano-silvers and acylamino.(2)The thermal stability, the swelling ratio, lower critical solution temperature (LCST) and the factors influencing the response performance of temperature and pH were measured by TG and DSC. The results showed that under the condition of n(DMAEMA):n(AMPS):n(AgNO3)=1:1:1, the swelling ratio was decreased from171.69to41.49due to silver nanoparticles; thermal decomposition temperature was decreased from253℃to175℃; LCST was still kept about66℃; the optimal conditions of response to the change of temperature and pH were that n(DMAEMA):n(AMPS)=3:1, the content of PEG400was20%of the total amount of monomers, the contents of silver nanoparticles were1%and5%of the total amount of monomers, respectively.(3)Nano silver-gallium/P(DMAEMA-co-AMPS) composites were prepared in-situ ultrasonic radiation method with2-(Dimethylamino)ethylmethacrylate (DMAEMA) and2-acrylamido-2-methyl-l-propanesulfonic acid (AMPS) as monomers, with silver nitrate and gallium element as source of metal The microscopic structure, the interaction between nanoparticles and polymer matrix and the thermal stability were characterized by various techniques including FT-IR, UV-Vis, XRD, XPS, TEM and TG. The results showed that nano silver-gallium alloy particles showed spherical with the length of5～30nm in diameter were dispersed highly and homogeneously on gray polymer matrix. Nano silver-gallium alloy particles and amide groups existed ligand effect. The combined effects of silver-gallium alloy particles on the thermal stability were not obvious, but a new decomposition temperature was emerged owing to synthesis of a new substance possibly. The more the content of nano silver-gallium alloy particles, the higher the UV absorption peak at425nm.