PBO纤维表面处理对EP/PBO复合材料性能的影响

通过自制的专用处理剂处理聚对苯撑苯并双恶唑(PBO)纤维表面,制备了环氧树脂(EP)/PBO纤维复合材料。通过傅立叶变换红外光谱仪和X射线光电子能谱仪对PBO纤维表面状态进行分析,采用扫描电子显微镜对经过剪切性能测试的NOL环试样破坏面形貌进行分析。结果表明,经过专用处理剂C处理后的PBO纤维表面浸润性得到提高,C、O、N三种元素的含量有较大变化,NOL环试样的剪切强度由文献中报道的15～18 MPa提高到27.83MPa,提高了约59%。     

高性能PBO纤维的开发和应用

主要阐述了世界PBO纤维的发展、东洋纺PBO纤维的生产和国内对PBO纤维的研究开发,以及PBO纤维在光缆增强材料、航海、航天航空、特殊工业等方面的广泛应用。     

PBO纤维表面空气冷等离子体改性

采用等离子体处理方法对PBO(聚对苯撑苯并二 口 恶 唑)纤维表面进行改性。用XPS和AFM测试分析等离子处理时间对PBO纤维表面组成和表面形貌的影响规律;首次采用浸润性测试和IR测试分析等离子体处理前后纤维浸润性和表面官能团的变化。用Microbond测试方法表征了纤维与树脂基体的界面剪切强度,并用SEM观察微复合材料破坏形貌。结果表明:等离子体处理后纤维浸润性得到改善,纤维表面苯环上引入了很多羟基。等离子体处理最佳条件下(170 W,10 min),纤维表面粗糙度最大,纤维表面O元素含量最大, O/C比率提高了50.5 %, IFSS值提高了64.7 %。     

Modifications of rigid rod poly(1,4-phenylene-cis-benzobisoxazole) fibers by gas plasma treatments

The surface modifications of poly(1,4-phenylene-cis-benzobisoxazole) fibers by gas plasma treatments have been investigated in this paper. Oxygen, nitrogen, argon, and ammonia were regarded as inlet gas, respectively. After the plasma treatments, the effects on the morphology of the fiber surface, the tensile strength, the surface free energy, and the polymer crystallization behavior in the interface were carefully studied. The results showed that the total surface free energy of the fiber was increased by 35.3%, from 47.6 to 64.4 mJ/m², after the oxygen plasma treatment for 15 min. The increase has been 32.4% for N₂ plasma, 28.8% for argon plasma, and 28.6% for NH₃ plasma. The interfacial crystallization behavior of thermoplastic polyether ether ketone was also presented.     

The effects of coagulants on the structure of PBO materials

PBO(poly(p-phenylene benzobisoxazole)),arigid-rod polymer containing an aromatic hetero-cyclicring,is characterized by high tensile strength,highstiffness,high thermal stability and other super proper-ties.It can be easily processed into fiber and film foruse in such fields as aerospace application,high tem-perature electrical insulation parts and protective gar-ments and so on[1-3].PBO materials are usually pre-pared through several steps in which polymerization,spinning or filming and coagu…     

高性能纤维的发展现状及特点与应用

介绍我国高性能纤维的发展现状以及聚对苯撑苯并二噁唑(PBO)纤维、聚苯硫醚(PPS)纤维、超高相对分子质量聚乙烯(UHMWPE)纤维三种常见的高性能纤维的应用,并采用了热性能分析(热重分析、热力学分析、动态力学分析)的测试方法介绍了PBO纤维、PPS纤维的特点。     

Heat resistance properties of poly(p-phenylene-2,6-benzobisoxazole) fiber

The high temperature properties of Poly(p-phenylene-2,6-benzobisoxazole) (PBO) fiber are examined and compared with those of the p-Aramid fiber. In particular, the temperature dependence of tensile strength of the PBO fiber is reported for the first time. The PBO fiber has 100°C higher decomposition temperature than the p-Aramid fiber, and the amount of toxic gases in combustion is much smaller than the p-Aramid fiber. Although the relative strength decreased proportionally in the range of room temperature to 500°C, the PBO fiber has 40% of the strength at room temperature even at a temperature of 500°C. After thermal treatment at 500°C for 60 s, the PBO fiber retained 90% of its original strength. The PBO fiber is expected to substitute for asbestos, which is still used as a heat resistant cushion material. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:1031–1036, 1997     

PBO纤维水解降解机理探讨

PBO纤维是非常强的合成纤维,是新一代的超高技术纤维,具有极好的力学性能和热性能,非常好的模量、强度和极强的耐化学品性,这些性能使PBO纤维成为高技术用的最佳材料。制造工艺对它的力学性能影响很大。PBO在高温和高相对湿度下将发生水解降解,压缩了它的应用范围。了解降解机理及其影响因素,对于更好地利用PBO是极为重要的。     

PBO纤维纸基复合材料的热老化及高温力学性能研究

本研究采用湿法成形技术制备了聚对苯撑苯并二噁唑（PBO）纸,将其浸渍聚酰亚胺（PI）树脂后,得到PBO纤维纸基复合材料（PBO/PI),随后对PBO/PI进行300℃的老化,并在300℃下测试了其拉伸性能。将PBO/PI与模拟蜂窝格壁的间位芳纶浸渍纸（PMIA/PI）进行对比,分析了老化和高温对PBO/PI和PMIA/PI力学性能的影响。结果表明,在300℃的高温老化下,由于材料微裂纹的产生及扩展,二者拉伸强度均呈下降趋势,但老化前后PBO/PI的强度均比PMIA/PI更强。动态力学性能显示,老化前后PBO/PI的储能模量大于PMIA/PI的储能模量,说明PBO/PI的刚性比PMIA/PI大,在高温下仍不易发生变形。在300℃的高温拉伸测试下,PBO/PI的拉伸强度和保持率均比PMIA/PI要高。PBO/PI在常温及300℃高温下的力学性能均优于PMIA/PI,PBO纤维制备的复合材料可用于需要高的抗变形和热稳定性的承重结构和蜂窝部件中。     

Effect of Surface Modification on Mechanical and Tribological Performance of Poly-p-phenylenebenzobisoxazole Fiber-Reinforced Polyimide Composite

This work examined the effect of coupling agent surface modification of Poly-p-phenylenebenzobisoxazole (PBO) fibers on mechanical and tribological performance of PBO fiber-reinforced thermoplastic polyimide (PBO/PI) composites. The results show that tensile strength and flexural strength are largely improved by coupling agent treatment. Under dry sliding conditions, coupling agent treatment is effective to reduce the wear of PBO/PI composite. The principle of improvement in interfacial adhesion between PBO fiber and PI matrix after coupling agent treatment was discussed. The surface characteristics of PBO fibers were characterized by X-ray photoelectron spectroscopy (XPS). It is found that the content of polar groups on the surface of PBO fiber treated by coupling agent increases compared with the untreated fiber. The presence of polar groups is probably leading to an increment of interfacial binding force between fibers and matrix in a composite system, and accordingly enhances the mechanical and tribological properties.