| 초록 |
To synthesize reactive type flame retarding PET, phosphorus based flame retardant triphenyl phosphate (TPP) was grafted to the poly(ethylene terephthalate) (PET) backbone by radical initiating pathway. And structural and thermal characteristics of these PET-TPP graft copolymers were performed by using solid-state 31P-NMR, FT-IR, GPC, and TGA. From the existence of peak for phosphorous atoms of solid-state 31P-NMR measurement, grafting of TPP on PET backbone was confirmed. This was also convinced by the FT-IR measurement showing phosphorusoxygen single bond (P-O-Ar) stretching vibration peaks from 625-570 cm-1 and by the increases in molecular weight of PET-TPP graft polymers measured by GPC. These grafted TPPs were suspected of playing catalytic role in char formation of PET under flame and it was confirmed by TGA thermograms showing the increased char yields of PET-TPP graft copolymer. Char yield increased from 10.82% (pure PET) up to 46.68% (PET-TPP graft copolymer). |
