聚对亚苯基苯并二噁唑(PBO)纤维的环境老化及防老化研究进展

综述了国内外聚对亚苯基苯并二噁唑(PBO)纤维老化的最新研究进展.重点介绍了国外研究PBO纤维水热老化和光照老化过程的方法以及对老化机理的推测和分析,指出通过改进纺丝工艺,完善纤维的结构以提高抗溶胀性能,选用合理的抗光氧化试剂以及对纤维进行化学改性,对纤维进行必要的物理防护等,将是今后PBO纤维抗老化的研究方向.     

聚对亚苯基苯并二噁唑（PBO）纤维的环境老化及防老化研究进展

综述了国内外聚对亚苯基苯并二噁坐（PBO）纤维老化的最新研究进展。重点介绍了国外研究PBO纤维水热老化和光照老化过程的方法以及对老化机理的推测和分析，指出通过改进纺丝工艺，完善纤维的结构以提高抗溶胀性能，选用合理的抗光氧化试剂以及对纤维进行化学改性，对纤维进行必要的物理防护等，将是今后PBO纤维抗老化的研究方向。     

聚对苯撑苯并双噁唑纤维改性技术的研究进展

介绍了近年来聚对苯撑苯并双噁唑(PBO)纤维的改性方法,并对今后PBO纤维的改性方向进行了展望。PBO纤维的改性主要是采用碳纳米管、石墨烯等纳米粒子及第三单体对PBO纤维进行共混复合及原位共聚改性,从而提高PBO纤维的力学性能、热学性能、表面性能及耐老化性能等。今后应加强改性体PBO基体的共聚改性机理及改性体对PBO聚合、纺丝过程的影响研究,探索多种改性技术的混合使用或新的改性技术,从而制备出更优异的高性能PBO纤维。     

PBO纤维光稳定性研究

研究了聚苯撑苯并二噁唑（PBO）纤维在自然环境中的光稳定性。PBO纤维对可见光和紫外光都十分敏感,波长范围400～450 nm的可见光即可导致PBO纤维力学性能下降,而波长范围200～400 nm的紫外光可以加速PBO纤维的老化过程,同时自然环境中温度、湿度的变化将会进一步加速PBO的光老化。PBO纤维经自然湿热老化3...     

PBO纤维的老化与防护

聚对苯撑苯并二噁唑(PBO)纤维在应用过程中老化现象严重,研究其老化机理与防老化措施具有十分重要的意义。对国内外PBO纤维老化的最新研究进展进行了综述,PBO纤维的老化主要是光老化、原子氧老化以及湿热老化,并提出了相应的老化机理及防护措施。建议今后PBO纤维的防老化研究应着重在PBO的合成过程中增加其立构规整性,使PBO的相对分子质量分布变窄,同时,改进PBO的聚合、纺丝及后处理工艺,另外,还需进一步探索高模量PBO纤维的老化机理及防护措施。     

PBO纤维及其改性的研究进展

简述了聚对苯撑苯并双噁唑(PBO)纤维的结构与性能;详述了PBO纤维的改性研究进展。PBO纤维的改性主要是改善其抗压性能和表面粘结性能。提高微纤间相互作用或交联等方法可提高PBO纤维的压缩强度;通过酸处理、偶联剂处理、等离子体处理及电晕处理等方法可提高PBO纤维的表面粘结性能。指出表面改性仍将是PBO纤维改性研究的重点。     

聚对苯撑苯并二嗯唑纤维展望

介绍了聚对苯撑苯并二嗯唑（PBO）纤维的性能特点、单体和聚合物合成及液晶纺丝制造工艺,综述了PBO纤维近30年来在国内外发展的技术进展及其应用前景,并对今后国内PBO纤维的发展提出了建议。     

PBO纤维界面改性研究

介绍了聚对苯撑苯并双噁唑(PBO)单体的盐酸盐合成及其优缺点;阐述了PBO的对苯二甲酸法、对苯二甲酞氯法、三甲基硅烷基化法、五氧化二磷调节法及预聚合法的合成方法及其优缺点;简述了PBO的纺丝方法。分析了PBO纤维的物理化学性能,对其各项性能做了比较;论述了PBO纤维界面改性界面理论及改性处理方法。指出PBO纤维的综合性能优异,应加大PBO规模的生产方法和界面改性研究,实现PBO纤维的规模化生产。     

聚对苯撑苯并二噁唑纤维展望

介绍了聚对苯撑苯并二噁唑(PBO)纤维的性能特点、单体和聚合物合成及液晶纺丝制造工艺,综述了PBO纤维近30年来在国内外发展的技术进展及其应用前景,并对今后国内PBO纤维的发展提出了建议.     

低温等离子体改性PBO纤维粘着性初步研究

采用低温等离子体技术处理聚对苯撑苯并双噁唑(PBO)纤维,并设计正交实验和剥离实验,通过测试改性前后PBO纤维与聚四氟乙烯(PTFE)膜之间的剥离强力和剥离功来反映粘结牢度,并验证了改性后PBO纤维粘着性的改善。研究发现:在实验条件下,改性后的PBO纤维与聚四氟乙烯膜之间的剥离强力和剥离功最大可提高58.7%和52.7%,粘结牢度增强,粘着性改善;并通过扫描电镜也观察到改性后PBO纤维粗糙程度增加,同时预测了表面粗糙程度与粘着性有一定的联系。     

Fabrication of uvioresistant poly(p-phenylene benzobisoxazole) fibers based on hydrogen bond

The poly(p-phenylene benzobisoxazole) (PBO) fiber with excellent performance is vulnerable to the irradiation of UV light, which significantly limits their application in advanced composites. Therefore, finding feasible and efficient ways to improve the uvioresistant properties of PBO fiber is of significance. In this work, a facile one-pot method is developed for continuously preparing the PBO/poly(2,5-dihydroxy-1, 4-phenylpyridimidazole) (PIPD) copolymer fiber to greatly enhance the anti-UV properties of PBO fibers. The experimental results demonstrate that the fabricated PBO/PIPD copolymer fiber (molar ratio of 7:1) with greatly improved surface wetting properties (the maximum increase can reach about 179%) possesses satisfactory and desired uvioresistant performance, which is 30.8% higher than that of pure PBO fibers after 480 h UV aging irradiation. The fabricated PBO/PIPD copolymer fiber with improved UV stability has the potential to be applied to many important application areas even in a severe and harsh environment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48432.     

Effects of light stabilizer on the ultraviolet stability of poly-p-phenylenebenzobisoxazole (PBO) fibers

A UV-resistant PBO fiber containing light stabilizer OB-1(2,2??-(1,2-ethenediyldi-4,1-phenylene) bis-benzoxazole) is reported. OB-1/PBO Fiber, which had excellent mechanical properties as PBO was prepared via in situ polymerization and dry-jet wet-spinning technique. Effects of the light stabilizer (OB-1) on UV stability of PBO fiber and possible degradation mechanism were investigated by tensile testing, intrinsic viscosity measurement, SEM, and ATR-FTIR analysis. Under UV-accelerated aging, the tensile strength of PBO fiber declined sharply. After exposed to UV 340-nm light for 310?h, the strength retention was only 44.17?%. SEM analysis showed the smooth and compact surface with well-oriented microfibrils was damaged. Meanwhile, the photostability of PBO fiber could be enhanced greatly by adding a small amount (0.05?C0.2?%) of OB-1. Under the same conditions, the strength retention of 0.2?%OB-1/PBO fiber increased to 64.84?%, which was 47?% higher than that of PBO fiber. SEM observation showed the surface of OB-1/PBO fiber was also damaged, but it was not as so severe as PBO fiber. After UV irradiation, the intrinsic viscosity of PBO and OB-1/PBO fiber decreased which implies that mild chain scissions occurred. ATR-FTIR analysis revealed that oxazole rings in PBO and OB-1/PBO backbone were disrupted and formed amide linkages. These results indicated the loss of strength is mainly due to the break of microfibrils and fiber morphology, mild chain scission, and the disruption of oxazole rings.     

热处理温度对PBO纤维性能的影响

PBO纤维因其具有高强度、高模量、高耐热性以及高化学稳定性等性能而被公认为目前综合性能最好的有机纤维。对自制的初生PBO纤维分别在500℃、550℃、600℃、650℃和700℃进行高温热处理,并对处理后纤维的力学性能、耐热性能、表面形貌以及界面性能进行测试。结果表明,500℃下热处理后PBO纤维拉伸强度最大为4.72GPa,随着热处理温度升高,纤维的力学性能下降;600℃下热处理后PBO纤维的初始分解温度最高为641.3℃;随着热处理温度的提高,PBO纤维的表面粗糙度在增加,同时其界面剪切强度(IFSS)也随着温度的升高而增大。     

PBO纤维用于耐高温气体过滤材料的探讨

合成纤维过滤材料越来越多地被应用于高温烟气过滤器中。聚苯撑苯并二嗯唑（PBO）纤维具有强度大、模量高、耐热性能突出、密度小、耐化学性好等特点。对自制的初生PBO纤维进行了高温热处理并对其进行了耐热及耐酸性能的测试。热处理后,PBO纤维的拉伸强度由2．86GPa提高到了3．94GPa;长期使用温度达到600℃;纤维在60%浓度的浓硫酸和63％浓度的浓硝酸中浸泡60d以后,拉伸强度依然可以分别保持在2．71GPa和2．11GPa。同其它高温烟气过滤材料用纤维相比,PBO纤维具有明显的优势。     

聚对苯撑苯并二恶唑纤维发展概况与应用前景

介绍了聚对苯撑苯并二恶唑（PBO）纤维的性能特点、单体和聚合物合成及液晶纺丝制造工艺,综述了PBO纤维近30年来在国内外发展的技术进展及其应用前景,指出PBO纤维是一种高强度、高模量、高热稳定性和高耐化学腐蚀性的新型纤维,在高温过滤、电子电气、合成材料、安全防护、国防军工、交通运输、航空航天、桥梁工程、建筑建材等20多个工业领域都有广泛的应用,并对今后国内PBO纤维的发展提出了建议。     

UV-Aging Resistance of Packaging Waste PE Modified Asphalts

The recycled packaging waste PE was adopted to modify the asphalt and the UV-aging resistance of the modified asphalt was studied through the UV-aging experiment. The results showed that the changing trends of softening point aging index, penetration aging index, elastic recovery aging index and viscosity aging index at 135°C of the modified and unmodified asphalt are similar. FTIR analysis and the microscopic structure of the asphalt indicated that there existed two kinds of reactions taking place in the aging process of packing waste PE modified asphalt, the oxidation of raw asphalt and the aging of the polymer.     

聚苯并噁唑(PBO)的合成及其应用研究

聚苯并噁唑(PB0)因其具有的强度大、耐高温、耐氧化、耐潮湿以及优良的热稳定性等特点，自20世纪80年代以来一直是人们关注的热点之一。综述了PB0的合成方法，如多磷酸法、中间相聚合法、三甲基硅烷基化法、对羟基苯甲酸酯法，并介绍了PB0纤维的性质，对其应用前景作了展望。     

Study on photoaging of poly(p‐phenylene benzobisoxazole) fiber

As a kind of rig‐rod‐like polymer, poly(p‐phenylene benzobisoxazole) (PBO) has received great interest because of its excellent mechanical properties and good thermal stability. The use of PBO fibers, however, is limited due to its low sunlight stability. In this work, the photoaging of PBO fibers, as well as the effects of oxygen and moisture on their photoaging, is investigated by tensile strength measurements, infrared spectroscopy, molecular mass determination, and scanning electron microscopy. It is first time to find that the photoaging of PBO fibers includes two development stages. The physical aging is the dominate factor at the first stage of photoaging relative to the second stage, in which the chemical aging is the dominate factor. In the first degradation stage, long defects appear and develop parallel to the fiber axis. Little chemical change occurs in this stage. In the second degradation stage, the molecular mass of PBO decreases and chemical degradation occurs. Oxygen accelerates the occurrence of chemical degradation. It is also found PBO fibers are more stable for photoaging when moisture and oxygen are isolated. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

PBO纤维热处理技术及其应用研究进展

对国内外聚对苯撑苯并双恶唑(PBO)纤维热处理工艺技术、PBO纤维热处理工艺机理研究进展、高模量PBO纤维的性能及应用进行了综述,对比了国内外成果及研究差距。阐明了国内PBO纤维关于热处理工艺研究尚处于试验阶段,虽能够小批量制备PBO高模量纤维,但与Toyobo公司产Zylon-HM纤维相比,在强度保持率、模量增长率、性能稳定性、产量及类型等方面还有差距。PBO纤维具有高强度、高模量、耐高热等性能,在航空航天、国防军工等领域的增强材料、耐高温、耐烧蚀材料之中,具有良好的应用前景和较高的市场价值。