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聚醚醚酮纤维的结构与性能 总被引:3,自引:0,他引:3
采用熔融纺丝法制得聚醚醚酮(PEEK)纤维,研究了纤维的结构与性能。结果表明:PEEK纤维纵向表面比较光滑,附着少量凝胶粒子,纤维断面近似圆形,内部致密无空洞;PEEK纤维经过热拉伸定型处理后,纤维结晶度和取向度提高,纤维聚集态结构更加完善稳定;其断裂强度大于3.5 cN/dtex,断裂伸长率为30%,干热收缩率为2%;PEEK纤维在300℃下连续使用7 d后,纤维的强度保留率大于70%;紫外光辐照6d后,其强度保留率为56.45%;PEEK纤维对化学溶剂具有很好的耐腐蚀性能。 相似文献
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聚醚醚酮纤维的拉伸定形后处理研究 总被引:2,自引:0,他引:2
通过熔融纺丝制得聚醚醚酮(PEEK)纤维,并采用差示扫描量热仪(DSC)、声速取向测量仪、热重分析仪、单纱电子强力仪分别研究了干热拉伸及热定形处理对PEEK纤维结晶和取向、热稳定性及力学性能的影响。结果表明:随着热拉伸倍数增大,PEEK纤维取向度、结晶度增加,纤维的断裂强度增加,断裂伸长减小;PEEK纤维的热拉伸温度应选在200~240℃,热定形温度应为220~260℃;PEEK纤维的重结晶主要是在热拉伸过程中完成,热定形则进一步完善纤维的结晶结构;经过后处理,PEEK纤维的断裂强度可达到6.12cN/dtex;且具有优异的热稳定性能,热分解温度高达505℃,后处理几乎不影响PEEK纤维的热稳定性。 相似文献
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研究了超细氧化钛纤维对PEEK摩擦磨损、耐热和结晶性能的影响,并与nano-TiO2粒子增强PEEK作对比,探讨了相关作用机理。结果表明:与nano- TiO2微粒相比,超细TiO2纤维具有更强的显微补强、显微耐磨作用,填充超细TiO2纤维的PEEK表现出更好的减摩耐磨特性和耐热性能。无论在较低载荷还是较高载荷下,超细TiO2纤维/PEEK复合材料的摩擦系数和磨损率均低于nano- TiO2/PEEK复合材料,且其磨损面、对偶面更加平整光滑。载荷200 N时,5%~10%相似文献
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聚醚醚酮复合材料摩擦学性能研究现状 总被引:1,自引:0,他引:1
介绍聚醚醚酮(PEEK)的基本物理化学性能,评述粒子填充、纤维增强、有机-无机共混和等离子处理PEEK复合材料的摩擦磨损性能研究进展,指出今后应加强对多因素协同作用下PEEK复合材料磨损机理、开展PEEK复合材料微观摩擦学及生物摩擦学方面的研究。 相似文献
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拉伸方式对聚醚醚酮纤维结构和性能的影响 总被引:1,自引:1,他引:0
采用进口聚醚醚酮(PEEK)树脂为原料,熔融纺丝制备了PEEK初生纤维,研究了一次拉伸和二次拉伸对PEEK纤维结构和力学性能的影响。结果表明:在150~270℃内,随着拉伸温度的提高,PEEK初生纤维的最大拉伸倍数增大,纤维的取向因子和力学性能提高;一次拉伸和二次拉伸时纤维的最大拉伸倍数相同,纤维的取向度、结晶度和力学性能基本相当,但二次拉伸纤维干热收缩率较低。二次拉伸时,总拉伸倍数相同,随着一段拉伸倍数的增大,纤维取向因子增大,力学性能提高;随着二段拉伸温度的提高,纤维结晶度增大,干热收缩率减小,取向因子基本相同,力学性能更优。 相似文献
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PEEK的改性及应用 总被引:2,自引:0,他引:2
综述对聚醚醚酮(PEEK)进行纤维增强、无机填料填充及有机材料共混等改性,提高其高温稳定性能、摩擦学性能和生物相容性等方面的最新研究进展简述了PEEK在航空航天、机械、汽车、生物食品工程、电子电气等对材料力学、热、化学、燃烧等性能有特殊要求的工程领域的应用. 相似文献
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Jiashuang Luan Shuling Zhang Zhi Geng Guibin Wang 《Polymer Engineering and Science》2013,53(10):2254-2260
A high‐temperature lubricant genioplast pellets (GPPS) was used in order to improve the processing behavior of poly(ether ether ketone) (PEEK) resin and high‐performance PEEK fibers were produced by melt‐spinning. The rheological properties of spinning material, morphology, mechanical, and thermal properties of PEEK fibers were characterized by using a polymer capillary rheometer, scanning electron microscopy, single fiber electronic tensile strength tester, wide‐angle X‐ray diffraction and thermal gravimetric analyzer, respectively. The results indicated that the introduction of lubricant GPPS decreased the melting viscosity of PEEK resin and improved spinnability of PEEK resin without sacrificing its thermal properties. The filaments are cylindrical with smooth surface and uniform diameter. The optimized content of GPPS was determined to be 1.0 wt% by balancing the decreased torque and changes of the mechanical properties. The strength and modulus of PEEK fibers were 420 MPa and 3.6 GPa, respectively. This should be due to the improvement in spinnability, followed by the enhancements in the orientation and crystallization of PEEK fibers in the process of drawing and annealing. POLYM. ENG. SCI., 53:2254–2260, 2013. © 2013 Society of Plastics Engineers 相似文献
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Effect of thermotropic liquid crystalline poly(ether ketone)arylates on the processibility and properties of poly(ether ether ketone)s fibers
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A series of composite fibers based on poly(ether ether ketone)s (PEEK) and a thermotropic liquid crystalline poly(ether ketone)arylates (PEKAR) have been prepared by melt spinning. The structure, compatibility, and properties of these composite fibers were investigated in detail by rheological measurements, differential scanning calorimetry, thermogravimetric analysis, wide‐angle X‐ray diffraction, scanning electron microscopy, orientation degree test, and mechanical properties test. The results showed that the addition of PEKAR could reduce the apparent melt viscosity of the blends obviously, which is beneficial in improving the processibility of PEEK at a relatively low temperature. After adding 1 wt % PEKAR to PEEK, the tensile strength of the post‐treatment fiber improved by 8.8%, whereas the crystallinity of the as‐spun fiber increased from 21.76% to 31.51%, and the orientation degree also increased with the addition of PEKAR. The result of morphology research suggested that PEKAR had a good compatibility with PEEK resin. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40595. 相似文献
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Mark F. Sonnenschein 《应用聚合物科学杂志》1999,72(2):175-181
A procedure for obtaining high performance large internal diameter (ID; >1 mm) hollow fiber microfiltration membranes from poly(ether ether ketone) (PEEK) is presented. A simple mixture of isomers of diphenylphthalate is a good solvent for employing the thermal‐phase inversion process to obtain PEEK membranes. Obtaining large ID hollow fibers with substantial transmembrane flux requires sufficient melt strength during spinning to prevent excessive draw of the extruding fiber. The use of a second leachable polymer to the blend satisfies the conditions, and polysulphone (PS) is found to provide superior membranes relative to either poly(etherimide) (PEI) or poly(ether sulphone) (PES) as a second polymer. PEEK membranes obtained by this process yield better chemical resistance to a concentrated warm surfactant/oil solution. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 175–181, 1999 相似文献
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K. H. Hsieh Y. C. Chern K. S. Hoe Y. Z. Wang B. W. Chan L. W. Chen 《Journal of Polymer Research》1996,3(2):83-88
A series of modified poly(ether ether ketone) (PEEK) polymers were synthesized by introduction of addition ether groups from dihydroxydiphenyl ether (DHDE) into the PEEK structure. The inherent viscosity of the DHDE-modified PEEK increased with reaction time at 320 °C. DSC thermograms showed the melting points of the obtained PEEK decreased with the increase of the DHDE content in the backbone. The degradation temperature (Td) was slightly decreased by the introduction of DHDE. The crystallinity as measured via the X-ray diffraction (XRD) increases with the introduction of DHDE into the modified PEEK. The crystalline structure was identified as an orthorhombic structure with lattice constants a = 7.72 Å, b = 5.86 Å, and c = 10.24 Å. Due to the glass transition temperature (Tg) and the melting temperature (Tm) decreasing with the increase of the DHDE content in the reaction system. the processability of the resultant PEEK could be improved through this DHDE modification. 相似文献
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J. V. Facinelli A. E. Brink S. Liu H. Li S. L. Gardner R. M. Davis J. S. Riffle M. Marrocco S. Harding 《应用聚合物科学杂志》1997,63(12):1571-1578
The physical form of polymers is often important for carrying out subsequent processing operations. For example, fine powders are desirable for molding and sintering compounds because they consolidate to produce void free components. The objective of this work is to prepare fine polymeric particulates suitable for processing into fiber reinforced polymer matrix composites. Micron size particles of poly(ether ether ketone) (PEEK) were prepared by rapidly quenching solutions of these materials. PEEK pellets were dissolved at temperatures near the PEEK melting point in a mixture of terphenyls and quaterphenyls; then the solution was quenched to a temperature between the Tg and Tm (≈ 225°C) by adding a room temperature eutectic mixture of diphenyl ether and biphenyl. A supersaturated, metastable solution of PEEK resulted, causing rapid nucleation. Fine PEEK particles rapidly crystallized from this solution. The average particle size was measured using transmission electron microscopy, atomic force microscopy, and by light scattering of aqueous suspensions which had been fractionated by centrifugation. The average particle diameter was about 0.6 μm. Three dimensional photomicrographs obtained via atomic force microscopy showed some aggregates in the suspensions. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1571–1578, 1997 相似文献
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综述了聚醚醚酮(PEEK)、聚醚酰亚胺(PEI)、聚四氟乙烯(PTFE)、热致液晶(TLCP)和聚醚砜(PES)等高性能工程塑料的共混改性研究进展,详细探讨了各种PEEK共混物的相容性、结晶行为、微观结构、热行为和力学性能等性能特征。PEEK与PEI在熔融和无定形状态下完全相容,常用于PEEK的结晶行为和微观结构的基础研究;与PTFE、TLCP、PES共混分别是提高PEEK的摩擦磨损性能、加工性能和热稳定性的有效手段。各种共混物的相容性好坏对其结晶行为和微观结构有重要影响,从而影响了共混物的力学性能。在此基础上,对PEEK共混改性领域进一步的研究方向和内容进行了讨论。 相似文献
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Jiashuang Luan Shuling Zhang Mei Zhang Zhi Geng Yang Wang Guibin Wang 《应用聚合物科学杂志》2013,130(2):1406-1414
High‐performance poly(ether ether ketone) (PEEK) fibers were prepared by melt‐spinning in the presence of thermotropic liquid crystalline poly(aryl ether ketone) copolymer (FPAEKLCP). The rheological and mechanical properties, birefringence, orientation, and crystallization of the resulting PEEK/FPAEKLCP fibers were characterized by using a melt flow indexer, capillary rheometer, single fiber electronic tensile strength tester, polarized light microscopy (PLM), and wide‐angle X‐ray diffraction (WAXD), respectively. The results indicate that the melt viscosity of PEEK significantly reduced by introducing FPAEKLCP, followed by the improvements in the spinnability and the quality of as‐spun fibers. The tensile properties of PEEK/FPAEKLCP fibers mainly depend on the content of FPAEKLCP, drawing temperature, drawing ratio, and annealing processes. Moreover, the tensile strength and modulus of PEEK/FPAEKLCP fibers are obviously higher than those of neat PEEK fibers under the same processing conditions. This should be attributed to an enhancement in the orientation and crystallization of PEEK compounded with FPAEKLCP. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1406‐1414, 2013 相似文献
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Crystallization kinetics of short glass and carbon fiber composites of poly(ether ether ketone) (PEEK) under melt-strain conditions have been obtained for the first time, using in-situ wide angle X-ray scattering, and have been correlated to a model based on the Avrami equation in order to enable minimization of the processing time for injection molding of these materials. It has been demonstrated that increased flow rate of the melt in the mold and, consequently, increased shear rate accelerates the crystallization process of PEEK composites, analogous to similar trends observed previously in PEEK resin. Short glass fiber composites of PEEK crystallize slower than the resin under identical processing conditions, while short carbon fiber composites crystallize faster than the resin, except at the highest mold temperatures and the lowest flow rates. A model based on the Avrami equation has been proposed to fit the kinetics data obtained experimentally. The Avrami coefficient has been calculated and Arrhenius plots have been used to predict the crystallization kinetics at temperatures lower than those at which experimental data have been obtained here. Fiber orientation, flexural elastic modulus, and flexural fracture toughness of the composites have also been evaluated. 相似文献
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Tingjian Huang Gong Chen Zhongchen He Jianjun Xu Pengqing Liu 《Polymer International》2019,68(11):1874-1880
Poly(ether ether ketone) (PEEK) hollow fiber membranes were prepared by a thermally induced phase separation method with polyetherimide as diluent, and N‐methyl pyrrolidone (NMP), dichloromethane and a composite extractant composed of NMP, ethanolamine and water as extractant. The effects of the different solvents induced crystallization on the pore structure during extraction and the properties of the PEEK hollow fiber membranes were investigated in detail. The crystallization behaviors of the membranes were characterized by DSC and XRD. The effect of the extractants on the microscopic morphologies, pore structures, water fluxes and mechanical properties of the membranes were investigated. The results showed that the extraction ability of the composite extractant was the most significant, followed by NMP and dichloromethane. The crystallinity of the hollow fiber was 39.0% before extraction and was elevated to 39.2% after the extraction with NMP, 46.6% with dichloromethane and 46.7% with the composite extractant, which shows that dichloromethane and the composite extractant have strong ability to induce the crystallization of PEEK. The inner and outer surfaces of the membranes obtained after extraction by the composite extractant had the largest pore size and the highest surface porosity. The most probable pore diameter of the membranes obtained after extraction by NMP, dichloromethane and the composite extractant was 23.26 nm, 24.43 nm and 24.43 nm, respectively, which indicated that solvent‐induced crystallization was beneficial for the formation of larger pores. The pure water flux of the PEEK membrane prepared by the composite extractant was the largest, but the tensile strength was the lowest. © 2019 Society of Chemical Industry 相似文献