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...     

复合抗紫外剂对PBO纤维光稳定性的影响

通过在聚合过程中同时添加有机紫外吸收剂UVA和UVP的方法制备了PBO聚合物,并通过干喷-湿纺工艺制备了含紫外吸收剂(UVA+UVP)的PBO纤维。考察了纤维的力学性能、特性粘度及表面形貌在紫外老化过程中的变化,结果表明,单独添加紫外吸收剂UVA能改善PBO纤维的紫外稳定性,而添加紫外吸收剂(UVA+UVP)则使PBO纤维的紫外稳定性进一步提高,并且都未给聚合和纺丝带来不利影响。     

氧等离子体处理对PBO纸页性能的影响

研究了PBO(聚对苯撑苯并双噁唑)浆粕在氧等离子体不同处理条件下对PBO纸页性能的影响.实验结果表明,氧等离子体处理是PBO浆粕十分有效的改性手段;经过氧等离子体处理后,PBO浆粕增加了活性基团,从而改善了浆粕的分散性能,提高纸页匀度;同时,PBO纸页的强度也有大幅度提高,裂断长从3.5 km提高到5.7km,撕裂指数从4.36 mN·m2/g提高到6.47mN·m2/g,耐破指数从4.78 kPa·m2/g提高到5.97 kPa·m2/g.     

Surface Modification of PBO Fibers for Composites by Coaxial Atmospheric Dielectric Barrier Discharge (PLA-PLA)

In this work, the surface modification of poly (1, 4-phenylene-cis-benzobisoxazole) (PBO) fibers by O 2 /Ar coaxial atmospheric dielectric barrier discharge was investigated, as well as the interfacial adhesion properties of modified PBO fibers/epoxy composites. The results indicated that the contact angle decreased remarkably from 84.7 to 63.5 after 3 min O 2 /Ar plasma treatment. SEM and AFM images showed that the surface of the treated PBO fibers became rather rough. In addition, XPS results suggested that the polar functional group (O=C- O) was introduced on the surface of the treated PBO fiber. The interfacial adhesion test showed that the interfacial shear strength (IFSS) and the interlaminar shear strength (ILSS) increased significantly by 63.54% and 130%, respectively. Moreover, the excellent tensile property of the PBO fibres was well preserved     

等离子体技术对高性能有机纤维表面改性的研究

本文简要介绍了几种高性能有机纤维(芳纶、PBO、UHMWPE、PPS等)的性能及其应用,并阐述了低温等离子体技术对这些纤维表面性能的改性研究情况,发现等离子体处理可以对纤维表面产生物理刻蚀和化学改性作用,不仅能显著增加纤维的表面粗糙度,还能在纤维表面引入一些极性基团,降低纤维的表面能,从而提高了纤维与树脂基体的粘结性能;同时,等离子体技术操作简单,对环境污染少,因而是一种很有效的环境友好型改性技术,很适合运用在高性能有机纤维表面改性领域.     

PBO纤维及其表面处理技术

介绍了PBO纤维的制备、结构、性能及其应用。并针对该纤维作为复合材料增强体,与树脂界面粘合性差的特点,综合评述了国内外对PBO纤维的表面处理方法。     

Crystallographic texturing in single poly(p-phenylene benzobisoxazole) fibres investigated using synchrotron radiation

A micro-focus synchrotron beam has been used to investigate crystallographic texturing in poly(p-phenylene benzobisoxazole) fibres. By generating diffraction patterns across single fibres, it is possible to produce profiles showing scattering intensity as a function of beam position across the fibre. A straightforward model has been developed to allow the degree of texturing to be quantified for direct comparison between fibre types. The experimental results are found to fit a radial fibrillar-texturing model, which incorporates a distribution in radial orientation about the fibre axis. Previous studies reporting the a-axis of the PBO unit cell to be aligned radially within fibrils about the fibre axis are found to be correct.The degree of radial fibrillar texturing is in the same fibre order as tensile modulus and crystalline domain orientation for PBO fibres with different processing histories. It is proposed that the degree of radial fibrillar texturing is therefore related to fibre homogeneity. An extrapolation of tensile modulus to that of a perfectly homogeneous fibre results in a value in good agreement with the PBO crystal modulus. This further supports the proposal that the degree of radial fibrillar texturing is related to fibre homogeneity.     

表面处理对环氧树脂/PBO纤维界面剪切强度的影响

采用了磺化聚芳酰胺(SPA)和固化剂593分别对PBO纤维进行表面处理,用钢针将配好的环氧树脂基体溶液似微球状滴在固定在试样架上的PBO纤维上,考察了处理前后PBO纤维与环氧树脂界面剪切强度的变化。结果表明,两种表面处理对PBO纤维与环氧树脂基体的界面剪切强度都有贡献,其中固化剂处理能显著提高界面剪切强度,改变了界面破坏模式,使PBO纤维与环氧树脂基体的界面剪切强度最高可达19.41 MPa,比未处理时的界面剪切强度提高95%。     

PBO 纤维表面改性研究进展

简要介绍了聚苯并双恶唑(PBO)纤维的结构与性能,综述了利用等离子体、γ射线、化学试剂、超临界流体以及生物载体等进行表面改性的方法,分析了各种方法的优劣并对 PBO 纤维的应用前景进行了展望。指出利用这些介质对 PBO 进行表面处理各有利弊,因此 PBO 纤维的表面处理由以前的单一、间歇性的化学改性方法逐步向连续的、在线的以及多种手段共用的复合处理方向发展。     

导电PBO织物的制备及其吸波性能

以离子注入法制备了导电聚对苯撑苯并二噁唑(PBO)织物,并对其表面形貌、结构和导电性能进行了表征。以导电PBO织物制备了频率选择表面(FSS),研究了FSS对纳米碳纤维(CNF)复合材料吸波性能的影响。