End-capped polyethylene terephthalate having superior carbonaceous char yield |
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| Authors: | Minkwan Kim Han Do Ghim |
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| Institution: | 1369. Department of Advanced Organic Materials Science and Engineering, Kyungpook National University, Daegu, 702-701, Korea
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| Abstract: | End-capping of PET with triphenyl phosphate (TPP), bisphenol A bis(diphenyl phosphate) (BDP), or resorcinol bis(diphenyl phosphate) (RDP) as phosphorous containing flame retardants was performed by using benzoyl peroxide as initiator. 31P NMR and FT-IR spectroscopy were used to evaluate end-capping of PET and structural changes of specimens. From thermal characteristics evaluated by differential scanning calorimetry and thermogravimetric analysis, BDP and RDP end-capped PETs show flame retarding mechanisms similar to those of blended counterparts. However, TPP end-capped PET presented superior carbonaceous char yields of up to 46.7 %, which was attributed to the condensed-phase action of TPP anchored at the ends of PET. |
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