Novel flame retardant poly(thiourea-sulfone-imide)s for high temperature applications: synthesis and characterization
作者:Ghulam WARIS、Humaira Masood SIDDIQI、Lance James TWYMAN、Rizwan HUSSAIN、Zareen AKHTER、Muhammad Saeed BUTT
DOI:10.3906/kim-1207-30
日期:——
The synthesis and polymerization of a novel diamine monomer, 1,1-(sulfonylbis (4,1-phenylene)) bis (thiourea) (SPT), with various aromatic dianhydrides were carried out. In addition, the fabrication of poly(thiourea-sulfone-imide)s (PTSIs) with noble thermal properties and flame retardancy was conducted. The structures of SPT and polymers were characterized by FT-IR, ^1H NMR, and ^13}C NMR spectroscopy along with elemental analysis. Crystallinity, organosolubility, inherent viscosity, and gel permeation chromatographic measurements were taken as well. The amorphous nature was exhibited by PTSIs containing C=S and --SO_2- moieties in the backbone that were readily soluble in highly polar organic solvents. The inherent viscosities of PTSIs were 0.89--1.13 dL g^-1} and molecular weights were 87,000--96,550 g mol^-1}, respectively. Their thermal stability was studied in terms of temperature at 10% weight loss, which ranged between 478 and 526 °C under inert atmosphere. Polyimides had a glass transition temperature around 253--268 °C depending on the dianhydrides used. The flame retardant properties of PTSIs were studied in terms of limiting oxygen index values and were measured in the range of 50--56.
研究人员进行了新型二胺单体 1,1-(磺酰基双(4,1-亚苯))双(硫脲)(SPT)与各种芳香族二酐的合成和聚合。此外,还制备了具有高热稳定性和阻燃性的聚(硫脲-砜-酰亚胺)(PTSIs)。通过傅立叶变换红外光谱、^1H NMR 和 ^13}C NMR 光谱以及元素分析,对硫脲砜和聚合物的结构进行了表征。此外,还进行了结晶度、有机溶解度、固有粘度和凝胶渗透色谱测量。骨架中含有 C=S 和--SO_2-分子的 PTSI 具有无定形性质,易溶于高极性有机溶剂。PTSIs 的固有粘度为 0.89-1.13 dL g^-1},分子量为 87,000-96,550 g mol^-1}。在惰性气氛下,它们的热稳定性以失重 10% 时的温度为单位进行了研究,温度范围在 478 至 526 ℃ 之间。根据所用二酐的不同,聚酰亚胺的玻璃化温度约为 253-268 ℃。根据极限氧指数值对 PTSIs 的阻燃性能进行了研究,测量值范围为 50-56。