4,6-二胺基间苯二酚盐酸盐的合成工艺研究

4,6-二胺基间苯二酚盐酸盐(DADHB)是制备聚对苯撑苯并双噁唑(PBO)的单体之一,今以改进的1,2,3-三氯苯路线由硝化、水解、催化加氢反应制得了各步反应的中间体和最终单体,并对中间体和单体进行了FT-IR、元素分析、HNMR、^13CNMR等分析。用优化原料配比直接过滤出水解物的工艺方法,简化了乙酸乙酯提取工艺中难以操作的缺点：并用HAc介质路线彻底解决了传统HAc／NaAc加氢工艺中易引入无机盐杂质的问题。     

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.     

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     

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。     

PBO纤维的合成、纺制、微相结构与性能研究进展

PBO(聚对苯撑苯并双噁唑)纤维是新一代超高性能纤维，文中对PBO纤维研制开发中关于合成、纺制、微相结构与性能方面的研究作一较详细的概述。特别阐述了其结构与性能关系研究的一些最新成果。