| 초록 |
A graft copolymer of poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM), was synthesized via atom transfer radical polymerization (ATRP), while fumed silica (SiO2) nanoparticles were modified by grafting POEM via a three-step synthetic approach. The resultant graft copolymer and modified SiO2 nanoparticles were blended to prepare PVC-g-POEM/SiO2-POEM nanocomposite membranes. Uniform distribution of SiO2-POEM nanoparticles in membranes and microphase-separated morphology were confirmed by transmission electron microscopy (TEM). X-ray diffraction (XRD) analysis revealed increased randomness of the amorphous phase in graft copolymer and continuous decrease in the interchain d-spacing with increased modified-SiO2 content, indicating a more closely packed nanocomposite membrane structure. The mechanical properties of PVC-g-POEM/SiO2-POEM films were superior to that of graft copolymer itself, resulting from strong interfacial interactions in the membranes due to the segregation and entanglement among the POEM chains. |
