【作者】 李光； 杨胜林； 金俊弘； 江建明；

【Author】 Li Guang, Yang Shenglin, Jin Junhong, Jiang Jianming (State Key Laboratory of Modification for Chemical Fiber and Polymer Materials, Donghua University, Shanghai 200051)

【机构】 东华大学纤维改性国家重点实验室；

【摘要】 <正> 聚对苯撑苯并二噁唑(PBO)自上世纪60年代初由Wolf发明后,作为耐高温聚合物受到重视,美国空军Wright实验室,Dow化学公司,日本东洋纺先后都参与了PBO的研究和开发。至1998年PBO高性能纤维在日本东洋纺中试成功,商品名Zylon。它的拉伸强度和模量分别是5.8GPa和300GPa,LOI为68,热分解温度650℃。作为先进复合材料的增强纤维,它优异的性能对减轻复合材料重量,拓展其应用领域具有重要的意义。它优异的阻燃性能和耐高温性能在消防和耐高温材料方面不可替代。更多还原

【Abstract】 Poly(p-phenylene-2,6-benzobisoxazole) (PBO) was synthesized from the polycondensation of diaminoresorcinol (DAR) and terephthalic acid (TPA) in polyphosphoric acid (PPA). The influence of the polymerization preferences such as the purity of DAR, the size of TPA, the P2O5 content in PPA and the shape of stirrer on the molecular weight of PBO was discussed. The PBO/PPA dope was spun into fibers by using screw extruder via the dry-jet, wet spinning techniques and the properties and structures of PBO fiber were investigated. It was found from the SEM observation that a compact, uniform structure would be obtained when the fibers were solidified lenitively in a diluted phosphoric acid solution. The break intensity and the thermal decomposition temperature of the PBO fibers could reach 4.38GPa and 600℃ respectively.更多还原