PBO纤维表面改性及其与树脂基体界面性能研究

分别采用化学处理、等离子体处理、偶联剂处理、γ射线辐照等单一改性方法和“辐照+等离子体”、“辐照+等离子体+偶联剂”等综合改性方法对PBO纤维进行表面处理,之后对各种不同方法改性后的纤维进行了单丝拉伸强度、与树脂的接触角和单丝拔出性能测试.结果表明,经综合改性方法处理后的PBO纤维综合性能最优,单丝拉伸强度保持率为85.1％,与水的接触角达到74.15°;与未经表面处理的纤维相比,其与树脂基体间的粘结强度提高了48.6％.     

辐照改性PBO纤维/环氧树脂界面性能

通过纤维浸润试验、NOL环层间剪切试验和扫描电子显微镜(SEM)分析，PBO纤维经γ-射线辐照表面改性处理前后对纤维浸润性能及纤维／环氧树脂界面性能具有一定的影响。将试验结果与化学交联和等离子氧处理的结果进行了比较。结果表明，γ-射线辐照对PBO纤维表面的改性效果最好。经过辐照接枝改性的PBO纤维与环氧基体的NOL环层间剪切强度(ILSS)从10．2MPa提高到23．1MPa，提高幅度130％。     

PBO纤维表面改性的研究进展

聚对苯撑苯并双噁唑(PBO)由于其特殊的表层结构,与聚合物树脂基体复合时存在严重的界面不相容性。简要介绍了PBO纤维的结构与性能,综述了化学刻蚀、偶联剂处理、等离子体处理、电晕处理、辐射处理、酶处理、热处理、化学涂层和超临界液体处理等PBO纤维表面改性方法。     

高性能纤维的表面改性及其与橡胶基体的界面粘合性能研究进展

从化学改性、物理改性和仿生修饰三个方面介绍高性能纤维的表面改性方法,并阐述提高高性能纤维与橡胶基体的界面粘合性能的研究进展。化学改性是通过化学活化刻蚀和引入活性基团等方式改善高性能纤维与橡胶基体的界面粘合性能,但反应不易控制,且化学改性存在环境污染问题,不易实现工业化;物理改性是通过紫外光辐照接枝以及等离子体、超声波、高能射线等处理对高性能纤维表面进行改性,可有效提高纤维与橡胶基体的界面粘合性能,值得进一步研究;新型环保的绿色浸渍体系及仿生修饰方法将在未来发挥一定的作用。     

PBO纤维表面改性技术的研究进展

介绍了聚对苯基苯并二噁唑(PBO)纤维的合成、结构与性能;同时,综述了目前常见的对PBO纤维表面改性方法的研究进展,如以等离子体处理、辐射处理和电晕处理等为代表的物理方法,以酸处理、偶联剂改性、共聚改性和酶处理等为代表的化学方法。     

高性能纤维表面改性研究进展

高性能纤维具有优异的性能,广泛用于宇航和军事领域,但是其与树脂基体之间的界面粘接性能较差,复合材料的层间剪切强度较低。针对这一复合材料体系,全面论述了提高其性能的几种方法以及各种方法的优缺点,其中包括纤维表面接枝、偶联、聚合物涂层、冷等离子体、γ射线辐射和超声波处理等,同时介绍了改性纤维的性能表征方法。     

PBO纤维表面改性方法的研究

对PBO纤维表面性能的改善进行了研究,考察了混杂芳纶纤维、电晕处理、偶联剂处理及强酸处理等多种方法对PBO纤维与环氧树脂表面粘接强度及其复合材料层间剪切性能的影响程度,比较了各种方法的改性效果及各自优缺点。     

超高分子质量聚乙烯纤维黏结强度增强方法研究

为提高超高分子质量聚乙烯(UHMWPE)纤维复合材料中纤维与树脂基体之间的界面黏结强度,提出通过不同质量分数的硅烷偶联剂KH-570处理纳米SiO_2对UHMWPE纤维进行表面改性。对改性处理后的纤维与乙烯基酯树脂进行黏结强度试验,发现硅烷偶联剂处理纳米SiO_2能有效提高纤维的界面黏结强度,同时使纤维保持一定的断裂强度。     

碳纤维/聚芳基乙炔复合材料界面改性方法的研究

为了改善碳纤维/聚芳基乙炔复合材料的界面性能,采用表面氧化、表面接枝、偶联剂、表面涂层等方法对碳纤维进行表面处理,探讨了各种方法对非极性聚芳基乙炔树脂基复合材料的界面改性效果。研究表明,纤维表面氧化处理后有利于碳纤维/聚芳基乙炔复合材料界面性能的改善,在此基础上通过表面接枝及表面偶联剂处理在纤维表面引入可与基体树脂发生反应的基团,可以达到非极性树脂基复合材料界面改性的目的。极性的高碳酚醛树脂可以更好地浸润氧化后的纤维表面,并且与聚芳基乙炔树脂在结构上相似,因此作为涂层处理纤维表面后可以明显提高材料的界面性能,该方法适于进行3D织物的改性处理,是较为理想的处理方案。     

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。     

Carbon nanotubes grafting PBO fiber: A study on the interfacial properties of epoxy composites

To improve the interfacial performance of poly[p‐phenylene benzobisoxazole] (PBO) fiber and epoxy resin, a modified multiwalled carbon nanotubes (MWCNTs‐Ecp) were used to achieve this purpose through grafting onto PBO fiber surface using a gamma ray radiation method. Experimental results indicated that the equilibrium wetting rate and equilibrium adsorption amount of the modified PBO fiber for epoxy resin and acetone were all higher than that of as received PBO fiber. The interfacial shear strength (IFSS) of single fiber composite increased from 31.4 to 77.5 MPa after modification. The fracture models of composites are changed from pure interfacial failure to combination failure of interface and resin interlayer. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers     

PBO纤维复合材料的研究及进展

聚对苯撑苯并二恶唑(PBO)纤维表面化学惰性较强,应用方面受到了较大的限制。PBO纤维经表面改性后可与其它化合物形成复合材料,如PBO树脂基增强复合材料以及PBO纤维纳米复合材料等,PBO纤维复合材料凭借优异的力学及化学性能在各领域都获得了较大的应用及发展。介绍了PBO树脂基增强复合材料和PBO纤维纳米复合材料的应用及发展。近些年,PBO纤维复合材料已经逐步取代传统的金属材料。但是目前PBO纤维复合材料仍有较大的研究空间,其开发对于航空、航天和国防等高新技术领域材料及产品更新换代具有重要意义。     

Effect of grafting alkoxysilane on the surface properties of Kevlar fiber

This research applied the methodology of metalation and grafting alkoxysilane to modify the surface of Kevlar‐29 fiber. The surface properties of the modified Kevlar fiber were characterized by scanning electron microscopy, X‐ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, and Brunauer‐Emmett‐Teller isothermal adsorption analysis. The relationship between surface characteristics of Kevlar fiber and its interfacial adhesion of Kevlar fiber‐reinforced epoxy resin composites was also discussed. Compared with the untreated fiber, the surface of the modified Kevlar fiber was much rougher, its oxygen content increased by about 12%, the surface area enlarged about 10 times, and the wetting behavior improved. Due to the modification of the fiber, the adhesion between the fiber and the resin matrix was markedly improved and the Interlaminar Shear Strength of its epoxy composites increased by about 57%. POLYM. COMPOS. 28:412–416, 2007. © 2007 Society of Plastics Engineers.     

香蕉纤维的表面改性及其增强环氧树脂复合材料的性能研究

采用硅烷偶联剂(A-174)偶联、高锰酸钾接枝和乙酰化包覆等3种方法对香蕉纤维进行表面改性,制备了改性香蕉纤维增强环氧树脂复合材料,测试其拉伸、弯曲、压缩、冲击等力学性能。结果表明,偶联、接枝、包覆等表面改性均能明显改善香蕉纤维与基体树脂的相容性,提高复合材料的力学性能,其中偶联改性的效果最好。当改性香蕉纤维含量为10wt%时,与未改性的香蕉纤维比较,复合材料的拉伸强度、弯曲强度、压缩强度分别提高了1.8、1.0、2.6倍;随着纤维含量的增加,复合材料的力学性能明显提高。     

Study on long fiber–reinforced thermoplastic composites prepared by in situ solid‐state polycondensation

Long glass fiber–reinforced thermoplastic composites were prepared by a new process, in situ solid‐state polycondensation (INSITU SSP). In this process reinforcing continuous fibers were impregnated by the oligomer of PET melt, and then the impregnated continuous fibers were cut to a desired length (designated prepreg); finally, the prepreg was in situ polymerized in the solid state to form the high molecular weight matrix. SEM, FTIR spectra, short‐beam shear stress test, flexural strength test, impact strength test, and the intrinsic viscosity measurement were used to investigate the wetting and interfacial adhesion, the mechanical properties of the composite, and the molecular weight of matrix resin in the composite. The results showed that the molecular weight of PET in the matrix resin and mechanical properties could be adjusted by controlling the SSP time and that the high level of interfacial adhesion between reinforcing fibers and matrix resin could be achieved by this novel INSITU SSP process, which are attributed to the good wetting of reinforcing fibers with low molecular weight oligomer melt as the impregnation fluid, the in situ formation of chemical grafting of oligomer chains onto the reinforcing fiber surface, and the in situ formation of the high molecular weight PET chains in the interphase regions. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91:3959–3965, 2004     

Improvement of interfacial shear strengths of polybenzobisoxazole fiber/epoxy resin composite by n‐TiO2 coating

Smooth polybenzobisoxazole (PBO) fiber has limited interfacial interaction with resin matrix. In this article, nano‐TiO₂ coating on PBO fiber is applied to improve the interfacial adhesion between PBO fiber and epoxy resin. The test results suggest that the PBO fiber had good interaction with epoxy resin matrix after its treatment with n‐TiO₂ sol. Nano TiO₂ particle embedded onto PBO fiber surface, acting as a chock, which made fiber implanted into the resin better. This greatly improved the shear strengths (IFSS) of PBO fiber/epoxy resin composite. It has been found that a 56% increase in interfacial IFSS has achieved without sacrificing mechanical properties of fiber. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Wettability assessment of plasma-treated PBO fibers based on thermogravimetric analysis

Changes in the surface wettability of poly(p-phenylene benzobisoxazole) (PBO) fibers were investigated by thermogravimetric analysis (TGA) following an air dielectric barrier discharge (DBD) plasma treatment. The results were then supplemented and confirmed by scanning electron microscopy (SEM), dynamic contact angle analysis (DCAA), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) measurements. After exposure to the DBD plasma at a pre-determined power level, TGA analysis showed that the residual rates retained by the PBO composites decreased, which meant an increase in the amount of resin coating the PBO fibers in the composites. Observations by SEM confirmed that there was more resin adhering to the treated PBO fibers and the wetting behavior of resin on the fibers was greatly improved. Meanwhile, DCAA for the treated fibers showed a significant enhancement in fiber surface free energy. XPS and AFM were performed in order to reveal any variations in fiber surface activity and surface morphology resulting from the surface treatment. The resulting data showed that increases in oxygen-containing polar groups and surface roughness on the plasma-treated PBO fibers contributed to the above improved wetting behavior. With comprehensive analyses, it was concluded that TGA could be used as a supporting method assessing the surface wettability of PBO fibers before and after air DBD plasma treatment.     

聚对苯撑苯并双噁唑、芳纶纤维及其复合材料

研究了聚对苯撑苯并双口恶唑(PBO)和芳纶(F-12)2种纤维的结构、性能及其单向复合材料的性能。电子扫描电镜照片微观结构的研究表明,PBO纤维与F-12纤维相比较,其分子取向更高,表面更光滑,因而与树脂基体的粘接力较差;而F-12纤维因为分子表面不均匀,有微小的浅沟槽,与树脂基体的接触表面积较大,因而粘接力强。复合材料性能的研究表明,PBO纤维的单向复合材料比F-12芳纶纤维的具有更好的拉伸性能,其中拉伸强度高约34.7%,拉伸模量高约63.8%。但其层间剪切强度却很低,只有24.3 MPa。     

Enzyme‐mediated surface modification of jute and its influence on the properties of jute/epoxy composites

Surface modification of jute fibers is necessary to improve the adhesion and interfacial compatibility between fibers and resin matrix before using fibers in polymer composites. In this study, dodecyl gallate (DG) was enzymatically grafted onto the jute fiber by laccase to endow the fiber with hydrophobicity. A hand lay‐up technique was then adopted to prepare jute/epoxy composites. Contact angle and wetting time measurements showed that the surface hydrophobicity of the jute fabric was increased after the enzymatic graft modification. The water absorption and thickness swelling of the DG‐grafted jute fabric/epoxy composite were lower than those of the other composites. The tensile and dynamic mechanical properties of the jute/epoxy composites were enhanced by the surface modification. Scanning electron microscopy images revealed stronger fiber–matrix adhesion in composites with modified fibers. Therefore, the enzymatic graft modification increased the fiber–matrix interface area. The fiber–matrix adhesion was enhanced, and the mechanical properties of the composites were improved. POLYM. COMPOS., 38:1327–1334, 2017. © 2015 Society of Plastics Engineers