| 초록 |
Toxic dioxins, i.e. polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), could be formed in the dispose of incineration process such as poly(vinyl chloride) (PVC). TiO2 nanoparticle/PVC composite is designed to suppress the emission of dioxins and its precursors in the disposal process. First, anatase TiO2 nanoparticle with size of about 5nm was prepared by a sol-gel process, and the size was evaluated using dynamic light scattering (DLS) analysis. It was compared with value from a Scherrer formular by wide angle X-ray diffraction (WXRD). Hyperbranched poly(ε-caprolactone) (HPCL) with terminal carboxylic acid groups were synthesized to facilitate the molecular self-assembly of TiO2 on to HPCL. The HPCL synthesis was confirmed with 1H-NMR and 13C-NMR, and the formation of nanohybrid were demonstrated using X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscope (FE-SEM) equipped with energy dispersive spectrometry (EDS). Nanohybrid/PVC blend was incinerated at 350oC, and compared with neat HPCL/PVC. The gas chromatography mass spectrometer (GC-MS) analysis was used to investigate the amounts of dioxins and its precursor emitted from the incineration. Calibration curves were constructed for quantitative analysis of the emission of toxic compounds. The emission was suppressed up to 60%. The high suppressing efficiency of the toxic compounds is regarded as the effect of TiO2 and good dispersion caused by a novel nanohybird. |
