中文摘要：

通过本体聚合方法合成了一系列侧链含苯酰亚胺结构的聚对苯二甲酸乙二酯（PET）共聚酯.研究发现,苯酰亚胺单元的引入不仅提高了共聚酯的玻璃化转变温度（Tg）和高温成炭性,并且大大降低了共聚酯高温下的热分解速率.随着苯酰亚胺含量的增加,共聚酯表现出更高的氧指数（LOI）值和更好的阻燃抗熔滴效果.锥形量热测试结果表明,苯酰亚胺结构的引入可以有效地降低共聚酯的峰值热释放速率（p-HRR）、峰值烟释放速率（p-RSR）和总烟释放量（TSR）.通过对纯PET和共聚酯燃烧测试后残炭的结构和形貌分析,发现苯酰亚胺结构有助于共聚酯形成石墨化程度更高的致密炭层,这些炭层起到隔热隔氧和抑制有机可燃烟气挥发的作用,在不引入传统阻燃剂的情况下,赋予共聚酯很好的本征阻燃性及抑烟性.

英文摘要：

A phenylimide-containing monomer was first introduced into PET backbone by bulk copolymerization, and a series of inherently flame-retardant, anti-dripping and smoke-suppressed copolyesters, P（ET-co-BN）n, where n denotes the molar part of BN per hundred mole of dimethyl terephthalate（DMT）（namely, BN：DMT = n：100）, were successfully synthesized. Thermogravimetric analysis（TGA） indicated that the introduction of the phenylimide group not only increased the char residue of the copolyesters at high temperatures, but also greatly decreased the thermal decomposition rate of the copolyesters. The initial decomposing temperature（T（5%）） of the copolyesters showed a slight increase compared with that of PET, indicating that the original thermal stability was maintained. With increasing the proportion of phenylimide, the copolyesters exhibited higher glass transition temperature（Tg）. Further more, the higher was the phenylimide content, the higher was the limiting oxygen index（LOI）. When P（ET-co-BN）（20） was tested at a high oxygen concentration of 29%, flame propagation was obviously slowed and extinguished within 52 s. After LOI test, the top zone of P（ET-co-BN）（20） specimen was covered by intumescent char layer, and no dripping was observed. Compared with those of neat PET, the peak heat release rate（p-HRR）, peak release smoke rate（p-RSR） and total smoke release（TSR） of P（ET-co-BN）20, obtained from cone calorimetry, were reduced by 51.5%, 44.7% and 31.1%, respectively, indicating its inherently low flammability and smoke suppression. Raman spectroscopy indicated that the formation of a thermally stable graphitic structure was promoted by the phenylimide at high temperatures. It could also be proved by SEM that the char layer of the copolyester was compact and coherent, which took an active part in isolating the unburned polymer from heat source, cutting off oxygen and preventing the volatilization of flammable fragments, resulting in excellent inherent fla