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空气等离子体处理芳纶纤维及其与天然橡胶/乳聚丁苯橡胶的黏合性能 总被引:2,自引:0,他引:2
考察了空气等离子体处理对芳纶纤维表面结构形态的影响,研究了空气等离子体和间苯二酚-甲醛-胶乳(RFL)浸胶处理芳纶纤维与天然橡胶(NR)/乳聚丁苯橡胶(ESBR)的黏合性能,并对经处理的芳纶纤维与NR/ESBR体系的界面层作了动态力学分析。结果表明,芳纶纤维经空气等离子体处理后,表面粗糙度增大,表面积增加,结晶度减小,但处理功率过大、处理时间过长时,芳纶纤维的表面又变得比较光滑、结晶度又呈增大趋势。随着等离子体处理时间的延长,芳纶纤维与NR/ESBR的黏合性能增强,但处理时间过长时,芳纶纤维与NR/ESBR的黏合性能下降;等离子体处理芳纶纤维经RFL进一步浸胶处理后,芳纶纤维与NR/ESBR的黏合性能大幅度提高。芳纶纤维与NR/ESBR的界面存在介于高模量芳纶纤维和低模量橡胶之间的过渡层。 相似文献
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通过研究芳纶纤维表面涂覆层的组成与涂覆层胶膜力学性能的关系,探讨了影响芳纶纤维涂覆层力学性能的因素,提出了适于芳纶纤维表面处理的间苯二酚甲醛胶乳(RFL)处理剂配方,并讨论了环氧树脂乳液、聚氨酯乳液和丙烯酸酯乳液对RFL胶膜的性能影响。 相似文献
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采用空气介质阻挡放电等离子体对国产芳纶ⅢA进行表面处理,优化了其处理工艺。用SEM、XPS等方法研究了处理前后纤维表面形态和化学状态的变化,通过短梁剪切试验评价了芳纶ⅢA/环氧复合材料的抗层间剪切强度。结果表明:经空气等离子体处理后芳纶ⅢA表面粗糙度增加,极性增强,纤维力学性能无明显变化,芳纶ⅢA/环氧复合材料的抗层间剪切强度提高了18%。 相似文献
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为改进芳纶Ⅲ增强树脂复合材料的层间剪切性能,采用1,6-己二异氰酸酯(HDI)对芳纶Ⅲ进行表面接枝改性处理;通过正交实验方法讨论了不同处理条件对芳纶Ⅲ复合材料层间剪切强度的影响;并对改性前后纤维的表面结构形貌及浸润性能进行表征。结果表明:最佳的接枝改性条件为HDI与催化剂质量比100∶1,反应时间24 h,反应温度20℃;芳纶Ⅲ经表面接枝处理后,纤维表面出现凸棱与凹槽,且接枝了活泼的—NH2基团,纤维与环氧树脂的接触角由处理前的73.6°减小至45.2°,芳纶Ⅲ对树脂的浸润性提高,从而提高其复合材料的层间剪切强度。 相似文献
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为了改善芳纶纤维复合材料的界面粘结性能,合成了一种新型树脂(AFR)作为基体,以未经任何表面处理的芳纶纤维作增强材料,制备了芳纶纤维/AFR复合材料。采用测定表面能、接触角、层间剪切强度、横向拉伸性能和扫描电镜观察形貌等方法,从宏观和微观等方面研究了芳纶纤维/AFR复合材料的界面粘结性能。结果表明,AFR树脂与芳纶纤维有相近的表面能,AFR树脂溶液与芳纶纤维的接触角为42.8°,而环氧树脂(EP)与芳纶纤维的接触角为68°,说明AFR树脂对芳纶纤维的润湿性优于EP树脂;芳纶/AFR复合材料的层间剪切强度、横向拉伸强度和纵向拉伸强度分别为74.64MPa、25.34MPa和2256MPa,比芳纶/EP复合材料的相应强度分别提高了28.7%、32.5%和13.4%,其复合材料破坏面的形貌也说明芳纶纤维与AFR树脂之间的界面粘结性能较好。 相似文献
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《高科技纤维与应用》2019,(2)
正本发明涉及一种芳纶绝缘拉杆及其制备方法。芳纶绝缘拉杆由浸渍有环氧树脂体系的纤维织物层形成,纤维织物层包括层叠设置的若干层芳纶纤维层和至少一层无机纤维层,无机纤维层的表面涂覆有偶联剂。应用本发明技术方案的芳纶绝缘拉杆,无机纤维层表面涂覆有偶联剂,使得无 相似文献
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预浸料要求树脂基体和增强纤维具有良好的匹配性,为了提高芳纶纤维/环氧树脂预浸料的界面相容性,本文从芳纶纤维表面改性及增韧技术两个方面进行综述,讨论了芳纶纤维物理改性和化学改性方法的优缺点,分析了界面增韧及环氧树脂基体的不同增韧途径,重点介绍了聚氨酯/环氧树脂互穿网络体系.认为芳纶纤维的偶联剂表面处理和聚氨酯增韧环氧树脂相结合,是提高芳纶纤维/环氧树脂预浸料层间剪切强度的的可行途径. 相似文献
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ABSTRACTThis paper describes the use of a combination of 4, 4’ bis(maleimido)diphenylmethane and ZnO as a high-temperature processable vulcanising agent for the short aramid and carbon fibre-filled bromo-isobutylene-isoprene rubber. The fibre breakage analysis, cure characteristics, mechanical, thermal and morphological properties of the composites were evaluated with different fibre loading. The fibre breakage analyses revealed that the aramid fibres have good length retention property compared to carbon fibres. The morphological analysis of the extracted aramid fibres showed severe surface roughness primarily due to fibrillation after shear mixing. The fibrillated aramid fibres lead to aggregation and poor dispersion of the fibres in the rubber matrix. However, fibrillation imparted surface roughness and increased surface area on the aramid fibres which improved the fibre–matrix interaction via mechanical anchoring. On the other hand, the carbon fibre-filled composite showed poor fibre–matrix interaction and inferior strength and modulus. 相似文献
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Isothermal DSC investigations on pure as well as glass, carbon, and aramid fibre-reinforced poly(phenylene sulfide) (PPS) were carried out in order to obtain informations on the crystallization kinetics, that is, the Avrami exponent, constant, half-time of crystallization, and (final) degree of crystallinity. PPS is a typical representative of semicrystalline polymers with a maximum degree of crystallinity of about 60%. The Avrami exponent reaches values from n = 2.1–2.7 depending on fibre type but independent of crystallization temperature. The system aramid fibre/PPS has a much shorter half-time of crystallization than the other three systems that could be attributed to the high nucleation effect of the aramid fibre surface to PPS. As a consequence of the high nuclei density a transcrystalline zone is built up around the aramid fibre. The relatively low value of the Avrami constant was discussed and a computer simulation attempt was made to understand the measured value quantitatively. © 1994 John Wiley & Sons, Inc. 相似文献
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Asbestos fibres, of the chrysotile variety, and chopped carbon fibres were pretreated by an in-situ polycondensation technique eventually resulting in a polyamide coating on the fibre surface. Ionomer based composites containing either carbon or asbestos fibres in random in plane fibre orientation were prepared, and the influence of this coating process on the tensile properties was investigated. It was found that for the asbestos-filled composites the presence of the nylon 6,6 interlayer improves the tensile performance, especially at moderate polyamide depositions. This is not the case with the pretreated carbon-filled composites for which carbon fibres with higher polyamide contents are preferred. Combinations of the treated asbestos fibres with carbon and/or aramid fibres may be used to reduce the asbestos content in asbestos-only based engineering plastics. 相似文献
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《塑料、橡胶和复合材料》2013,42(3):134-143
AbstractCarbon fibre reinforced polymer fabric specimens prepared from selectively stitched thick laminates have been tested under mode I (tension) and mode II (shear) loading, similar to already established tests used for thin unidirectional specimens. The respective interlaminar fracture toughness characteristics were derived for laminates of different stitching configurations. Results indicated significant interlaminar fracture toughness increase for all stitched samples compared with non-stitched samples, especially under mode I loading. It was concluded from parametric investigations that carbon thread stitching is more effective than its aramid counterpart in improving interlaminar fracture toughness. This is attributable to its higher stiffness and better bonding to the carbon fibre reinforced polymer system compared with the aramid thread. 相似文献
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Dan Sheng Yunli Wang Xin Wang Xuefeng Lu Shan Jiang Heng Pan Genyang Cao Weilin Xu 《Coloration Technology》2017,133(4):320-324
In this study, meta-aramid fibres were pretreated with 2-phenoxyethanol under different conditions to investigate the effect of 2-phenoxyethanol on the dyeing of aramid at low temperature (95 °C). Structural alteration of the pretreated fibres was reflected by thermogravimetry and Fourier transform infrared spectroscopy, indicating more H-bonds, lower crystallinity, and slightly lower thermal stability. The change in structure showed that 2-phenoxyethanol combined with the fibre macromolecules and resulted in swelling of the fibre. Creation of a biphasic system through the addition of 2-phenoxyethanol to the dyeing solution resulted in the cationic dye being partitioned more towards the 2-phenoxyethanol-rich phase than the aqueous phase. The cross-sections of the dyed fibre suggested that the meta-aramid fibre could be dyed more thoroughly with an appropriate concentration of 2-phenoxyethanol. The colour value of aramid fabric was tested by varying the concentration of 2-phenoxyethanol and the temperature of pretreatment, indicating a dramatic improvement in dyeing performance to aramid after 2-phenoxyethanol pretreatment. 2-Phenoxyethanol pretreatment and low-temperature dyeing can overcome the problems of chemical and energy waste while producing a satisfying colour. 相似文献
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综述了对位芳纶的树脂粉末、短切纤维和浆粕增强热塑性树脂的研究进展,包括与热塑性树脂的共混方法以及对增强热塑性复合材料的摩擦磨损和力学性能的影响。综述结果表明,对位芳纶树脂粉末增强热塑性树脂后具有优异的耐磨性能,但要求对位芳纶树脂粉末颗粒粒径在150 um以下,这种超细粉末对研磨加工要求较高;对位芳纶短切纤维的长度为1.5mm,并须对其表面进行改性处理,生产这种超短切纤维的短切机需进口且昂贵;对位芳纶浆粕可采取熔融共混后造粒和切断再熔融共混的方法避免团聚的产生。同时指出,国内对位芳纶企业在努力实现稳定规模化生产基础上,应积极进行下游产品的开发。 相似文献
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Short aramid fibers have been successfully used to reinforce the interface adhesive property between carbon fiber/epoxy composites and aluminum foam, and to form aramid‐fiber “composite adhesive joints.” In this study, to further improve the reinforcing effect of the aramid‐fiber‐reinforced adhesive joints, aramid fibers were ultrasonic treated to conduct different surface conditions. Critical energy release rate of the carbon fiber/aluminum foam sandwich beams with as‐received and treated interfacial aramid fibers were measured to study the influence of the surface treatment on aramid fibers. It was found that reinforcements in critical energy release rate were achieved for all samples with treated aramid fiber as measured under double cantilever beam condition. The interfacial characteristics of the short aramid fibers with different surface condition were investigated and discussed based on scanning electron microscopy observations. It is suggested that advanced bonding between aramid fibers and epoxy resin was conducted after surface treatment, and more energy was therefore absorbed through fiber bridging during crack opening and extension process. POLYM. COMPOS., 36:192–197, 2015. © 2014 Society of Plastics Engineers 相似文献
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Friedel–Crafts Reaction as a simple and convenient approach to the surface modification of aramid fiber was introduced in this paper. Epoxy chloropropane
was chosen as the treatment reagent to modify aramid fibers surface via Graft reaction. After the modification, the interfacial properties of aramid/epoxy composites were investigated by the single fiber pull-out
test (SFP), and the mechanical properties of aramid fibers were investigated by the tensile strength test. The results showed
that the interfacial shear strength (IFSS) value of aramid/epoxy composites was enhanced by about 50%, and the tensile strength
of aramid fibers had no obvious damage. The crystalline state of aramid fibers was determined by X-ray diffraction instrument
(XRD), and the results showed that there were not any distinct crystal type varieties. The surface elements of aramid fibers
were determined by X-ray photoelectron spectroscopy (XPS), the analysis of which showed that the oxygen/carbon ratio of aramid
fiber surface increased obviously. The possible changes of the chemical structure of aramid fibers were investigated via Fourier
transform infrared spectrum (FTIR), and the analysis of which showed that the epoxy functional groups were grafted into the
molecule structure of aramid fibers. The surface morphology of aramid fibers was analyzed by Scanning electron microscope
(SEM), and the SEM results showed that the physical structure of aramid fibers was not etched or damaged obviously. The surface
energy of aramid fibers was investigated via the dynamic capillary method, and the results showed that the surface energy
was enhanced by 31.5%, and then the wettability degree of aramid fiber surface was enhanced obviously too. All of the results
indicated that this novel chemical modification approach not only can improve the interfacial bonding strength of aramid/epoxy
composites remarkably, but also have no negative influence on the intrinsic tensile strength of aramid fibers. 相似文献
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Co60 γ‐ray radiation as a simple and convenient method for surface modification of Armos aramid fibers was introduced in this article. Two kinds of gas mediums, N2 and air, were chosen to modify aramid fiber surface by γ‐ray irradiation. After fiber surface treatment, the interlaminar shear strength values of aramid/epoxy composites were enhanced by about 17.7 and 15.8%, respectively. Surface elements of aramid fibers were determined by XPS, the analysis of which showed that the ratio of oxygen/carbon was increased. The crystalline state of aramid fibers was determined by X‐ray diffraction instrument. The surface topography of fibers was analyzed by atomic force microscopy and scanning electron microscope. The degree of surface roughness and the wettability of fiber surface were both enhanced by γ‐ray radiation. The results indicated that γ‐ray irradiation technique, which is a suitable way of batch process for industrialization, can significantly improve the surface properties of aramid fibers reinforced epoxy resin matrix composites. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献