Study On The Preparation And Property Of Polyester Composites Modified By Nano-copper Oxides

Due to good heat resistance, broad-spectrum antibacterial, low toxicity and noresistance, inorganic antibacterial agent has become a hot research topic in the field ofantibacterial. Ag+is the best inorganic antibacterial agent, because of its activechemical properties, worse discoloration property or easy to be reduced to black silverunder the condition of UV. This characteristics not only influence the quality ofproduct, but also affect the antibacterial properties. Copper ions is betterantibacterial material for the functional polymer composites and polyester products.Cuprous oxide, titanium dioxide and zinc oxide have antimicrobial properties.Thereinto titanium dioxide can improve the performance of strands in the spinningprocess. Silicon dioxide is advantageous to the dyeing and finishing process for thefunction of making the fiber have better spinnability and tensile properties because ofits property which makes the silk surface appearing groove. It is the first time forpreparation of doped inorganic antibacterial agent with cuprous oxide, titaniumdioxide, silica and zinc oxide, and added to the PET by melt blending. Modifing theinorganic nanoparticles improved the compatibility of PET and inorganic particles.The results achieved in this paper were listed as follows:1. This method is based on the reduction of CuSO4with ascorbic acid by a facilesolution-phase route. In this process, titanium dioxide, silica and zinc oxide wereadded. The morphologies and structure of nanoparticles were analyzed by FourierTransform Infrared (FT-IR), Scanning Electron Microscope(SEM) and X-RayDiffraction(XRD). We screened the appropriate modifier to modify the inorganicparticles and the dosage of silane coupling agent, modified time and stirring speed,which influence the modification effect, have also been studied. And the bestexperiment condition we get is that the dosage of modifier is2%, the reaction time is2hours under the high-speed mechanical agitation.2. According to the standard of GB/T21510-2008, antibacterial tests wereconducted. The antibacterial activity of the samples were evaluated against S. aureusand E. coli. Herein, when the concentrations of cuprous oxide and composite particles were10μg/ml, Cu2O crystals had better antibacterial ability than compositeparticles.3. Furthermore, the modified composite particles and dry polyester chips wereextruded by twin-screw extruder. The dispersibility of composite particles in PETmatrix was evaluated by means of SEM and polarizing microscope. The resultsshowed that the dispersibility of the modified composite particles were better thanthe unmodified composite particles. The kinetics of thermal degradation andcyrstallization behavior of PET and nanocomposites were characterized via TGAanalysis and DSC analysis. The results showed that nanoparticles enhanced theactivation energies of different stages of thermal degradation except the initial stepof thermal degradation, which showed that nanoparticles improved the thermalstabilities of nanocomposites.