A novel flame-retardant-free copolyester: cross-linking towards self extinguishing and non-dripping
作者:Hai-Bo Zhao、Li Chen、Jun-Chi Yang、Xin-Guo Ge、Yu-Zhong Wang
DOI:10.1039/c2jm34376b
日期:——
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。