In this manuscript, contradiction between the non-flammability and non-dripping of polyesters could be solved by copolymerizing terephthalic acid and ethylene glycol together with a pendent phenylethynyl-based monomer named 4-(phenylethynyl) di(ethylene glycol) phthalate (PEPE), which exhibited a cross-linkable nature at a proper temperature. TG-DSC simultaneous thermal analysis, FTIR, dissolution tests and rheological investigations proved the thermal cross-linking behavior of the copolyester, which was not active at the temperature of polymerization and processing but could cross-link rapidly at higher temperature before burning. LOI tests, cone calorimetry and small-scale flame tests further confirmed the self-extinguishment and inhibition for melt-dripping could be achieved through the cross-linking during burning, despite the absence of any flame-retardant element (say, bromine, chlorine, phosphorus, or nitrogen, etc.). Rheological analyses and the SEM microphotographs of the char showed P(ET-co-P)s exhibited a greater complex viscosity through the cross-linking at high temperature, leading to compact char residue, flame-retardant and anti-dripping effects.
在这份手稿中,聚酯的不燃性和不滴落性之间的矛盾可以通过将
对苯二甲酸和
乙二醇与一种名为4-(
苯乙炔基)二(
乙二醇)
邻苯二甲酸酯(PEPE)的
苯乙炔基单体共聚来解决,该单体在适当的温度下表现出交联性质。TG-
DSC同步热分析、FTIR、溶解度测试和流变学研究证明了共聚酯的热交联行为,该共聚酯在聚合和加工温度下不活跃,但在燃烧前的较高温度下可以快速交联。LOI测试、锥形量热法和小型火焰测试进一步证实,尽管没有任何阻燃元素(如
溴、
氯、
磷或氮等),但通过燃烧过程中的交联可以实现自熄灭和抑制熔滴。流变学分析和
炭黑的
SEM显微照片显示,P(ET-co-P)s在高温下通过交联表现出更大的复合粘度,从而形成致密的
炭黑残留物,具有阻燃和防滴落的效果。