聚芳醚酮的改性研究

综述了特种工程塑料聚芳醚酮改性研究的进展,主要介绍了聚芳醚酮结构改性的三大类方法:主链上引入其他基团、主链上引入大侧基及共聚改性。研究表明,通过结构改性可以在保持聚芳醚酮高的耐热性能和力学性能的基础上有效地改善其加工性能和在有机溶剂中的溶解性。同时简介了聚芳醚酮与聚酰亚胺、聚醚砜、聚苯硫醚等高性能树脂以及不同种类的聚芳醚酮间共混改性的研究状况。     

聚芳醚酮化学改性研究进展

介绍了聚芳醚酮的物理化学性质,主要对近年来研究的热点超支化聚醚酮改性、化学改性和磺化改性等进行了综述.     

含二氮杂萘酮结构聚芳醚酮和聚芳醚砜研究进展

综述了含二氮杂萘酮结构的聚芳醚酮和聚芳醚砜的结构性能及其合成、改性、应用研究进展。     

碳纳米管复合材料的制备与电磁屏蔽性能分析

为提升聚醚醚酮的电磁屏蔽性能,本次研究通过碳纳米管、3,3’,5,5’-四甲基联苯二酚、N-溴代琥珀酰亚胺、叠氮化聚芳醚酮等材料制备PAEK-g-MWCNTs填料,并通过该填料对聚醚醚酮实施改性处理,进而制备出PAEK-g-MWCNTs/PEEK复合材料,在此基础上通过矢量网络分析仪对该复合材料的电磁屏蔽性能进行检测。经实验研究发现,PAEK-g-MWCNTs填料能够显著提升聚醚醚酮在X波段频率范围内的透射系数、吸收系数、反射系数以及综合电磁屏蔽效率,强化聚醚醚酮的电磁屏蔽性能。     

耐高温含氟聚芳醚酮和聚芳醚砜的合成与性能研究

通过三步反应合成新的含氟双酚单体3,4-二氟苯基对苯二酚,由该含氟双酚单体、4-氟苯基对苯二酚、邻苯基对苯二酚分别与4,4′-二氟二苯酮、4,4′-二氯二苯砜经亲核缩聚反应,制备了一系列新型聚芳醚酮和聚芳醚砜。采用 FT-IR、DSC、TGA及XRD手段等对聚合物的结构和性能进行了表征和研究,结果表明：合成的聚芳醚酮和聚芳醚砜具有优异的耐热性能,玻璃化转变温度分别在150~159 ℃和177~196 ℃之间,氮气中5 %热失重温度分别在527 ℃和507 ℃以上。合成的聚芳醚酮和聚芳醚砜具有良好的溶解性,室温下能溶解在N-甲基吡咯烷酮、二甲基乙酰胺、氯仿等有机溶剂中。     

聚醚醚酮／聚醚砜共混物的研究

采用熔融共混技术制备聚醚醚酮/聚醚砜共混物,研究了共混物的性能。在K_2CO_3和Na_2CO_3等比混合盐存在下,在二苯砜溶剂中4,4′-二氟苯酮与对苯二酚熔融缩聚,然后加入用二苯砜熔融的聚醚砜即得到共混物。研究发现两者有较好的相容性,共混物力学性能相当于两者的加和值,与聚醚醚酮相比,共混物Tg提高了50～75℃,压片温度降低了约100℃,结晶度随聚醚醚酮含量增加而增大,表明改性后的聚醚醚酮加工性有了明显改进。     

新型聚芳醚酮的研究进展

介绍了聚芳醚酮的合成路线与性质,并讨论了其改性的研究方向和进展,例如利用共聚共混对其改性,在聚 芳醚酮的主链中引入大的侧基破坏其规整性,以及研制含氟的新型聚合物。     

聚芳醚酮的表面修饰及其在生物医用领域的应用

综述了特种工程塑料聚芳醚酮的表面修饰方法及其在生物医用领域的应用。重点介绍了选择性湿化学法和等离子体处理等聚芳醚酮表面改性方法及通过固定细胞外基质的生物功能化途径;最后,介绍了聚芳醚酮及改性聚芳醚酮在细胞培养基体、椎间融合器、关节摩擦面等临床植入体方面的应用进展,并对聚芳醚酮在生物医用领域的发展前景进行了展望。     

新一代耐高温多功能重防腐涂料用树脂——聚芳醚酮的国内外发展历程及现状

聚芳醚酮(PAEK)类树脂属于耐高温、高强度的热塑性工程塑料,作为化工设备重防腐领域中搪玻璃制品的代替品,它已被日本和欧美等国家广为采用。本文从产品开发、应用领域和涂覆工艺等方面论述了PAEK类树脂的发展历程。介绍了国内在PAEK类树脂合成方面所取得的突破:在第一代产品聚醚醚酮(PEEK)的合成中,以新的溶剂环丁砜取代二苯砜,降低了聚合温度,缩短了聚合周期,减少了溶剂消耗,生产效率提高了一倍;在第二代、第三代产品的研发中,立足于国产原料,合成了具有更高耐热等级的PEEKK和PEDEK产品,它们的耐热性比国外产品更好,但成本大幅度下降。     

新一代耐高温多功能重防腐涂料用树脂——聚芳醚酮的国内外发展历程及现状

聚芳醚酮(PAEK)类树脂属于耐高温、高强度的热塑性工程塑料,作为化工设备重防腐领域中搪玻璃制品的代替品,它已被日本和欧美等国家广为采用.本文从产品开发、应用领域和涂覆工艺等方面论述了PAEK类树脂的发展历程.介绍了国内在PAEK类树脂合成方面所取得的突破:在第一代产品聚醚醚酮(PEEK)的合成中,以新的溶剂环丁砜取代二苯砜,降低了聚合温度,缩短了聚合周期,减少了溶剂消耗,生产效率提高了一倍;在第二代、第三代产品的研发中,立足于国产原料,合成了具有更高耐热等级的PEEKK和PEDEK产品,它们的耐热性比国外产品更好,但成本大幅度下降.     

Dispersion of multi‐walled carbon nanotubes in poly(aryl ether ketone) obtained by in situ polymerization

BACKGROUND: Recently, much work has focused on the efficient dispersion of carbon nanotubes (CNTs) throughout a polymer matrix for mechanical and/or electrical matrices. However, CNTs used as enhancement inclusions in a high‐performance polymer matrix, especially in poly(aryl ether ketone) (PAEK), have rarely been reported. Therefore, multi‐walled carbon nanotube (MWNT)‐modified PAEK nanocomposites were synthesized by in situ polymerization of monomers of interest in the presence of pre‐treated MWNTs. RESULTS: This process enabled a uniform dispersion of MWNT bundles in the polymer matrix. The resultant MWNT/PAEK nanocomposite films were optically transparent with significant mechanical enhancement at a very low MWNT loading (0.5 wt%). CONCLUSION: These MWNT/polymer nanocomposites are potentially useful in a variety of aerospace and terrestrial applications, due to the combination of excellent properties of MWNTs with PAEK. Copyright © 2009 Society of Chemical Industry     

Next generation high‐performance carbon fiber thermoplastic composites based on polyaryletherketones

Interest in carbon fiber reinforced composites based on polyaryl ether ketones (PAEKs) continues to grow, and is driven by their increasing use as metal replacement materials in high temperature, high‐performance applications. Though these materials have seen widespread use in oil, gas, aerospace, medical and transportation industries, applications are currently limited by the thermal and mechanical properties of available PAEK polymer chemistries and their carbon fiber composites as well as interfacial bonding with carbon fiber surfaces. This article reviews the state of the art of PAEK polymer chemistries, mechanical properties of their carbon fiber reinforced composites, and interfacial engineering techniques used to improve the fiber‐matrix interfacial bond strength. We also propose a roadmap to develop the next generation of high‐performance long fiber thermoplastic composites based on PAEKs. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44441.     

Enhanced propylene/propane separation by carbonaceous membrane derived from poly (aryl ether ketone)/2,6-bis(4-azidobenzylidene)-4-methyl-cyclohexanone interpenetrating network

An innovative combination of a photosensitive crosslinker, 2,6-bis(4-azidobenzylidene)-4-methyl-cyclohexanone (Azide) with poly (aryl ether ketone) (PAEK) is utilized to form a semi-interpenetrating network (IPN) as the precursor for carbon membranes. Low temperature pyrolysis (450-650 °C) of this precursor produces carbon membranes with excellent olefin/paraffin separation performance that surpasses the conventional trade-off line. The carbon membranes have reasonably good flexibility since excessive closure of the micropores is avoided. This is evident from the mechanical properties of the carbon membranes obtained from nanoindention to the pore size distribution derived from CO₂ adsorption. By varying the composition of Azide/PAEK and optimizing the low-temperature pyrolysis protocol, it was found that PAEK/Azide (80:20) pyrolysed at 550 °C exhibits the best propane/propylene separation performance with C₃H₆ permeability of 48 barrer and ideal C₃H₆/C₃H₈ selectivity of 44. Due to strong competitive sorption of propane and propylene molecules, the C₃H₆ permeability is lowered to 3.6 barrer and the C₃H₆/C₃H₈ selectivity to 32 in mixed gas experiments. However, this separation performance is still above the trade-off line. Even though both Azide and PAEK cannot form useful carbon membranes, their IPN is a unique precursor that can produce carbon membranes with comparable performance.     

Microstructure Development,Wear Characteristics and Kinetics of Thermal Decomposition of Hybrid Nanocomposites Based on Poly Aryl Ether Ketone,Boron Carbide and Multi Walled Carbon Nanotubes

In the present study a high performance polymer poly aryl ether ketone (PAEK) is reinforced with micro and nano boron carbide (B₄C) and functionalized multi walled carbon nanotubes (F-MWCNT) to investigate the individual and hybrid effect of the fillers. Optical microscopy and transmission electron microscopy suggested the dispersion of micro and nano fillers respectively in PAEK matrix. The inclusion of B₄C nano fillers increased the hardness of the composites which aided the wear resistance of the composites. The morphological features of the worn surface of the samples are analyzed using scanning electron microscopy. It is found from the izod impact test analysis that the impact strength of the composite enhanced by the F-MWCNT inclusion. The thermal properties of PAEK in the composites are studied using differential scanning calorimetry and it revealed dominant effect of F-MWCNT influencing the thermal transitions than the B₄C particles. The kinetics of thermal degradation of various composites is analyzed using Coats–Redfern method. The positive influence of B₄C in the matrix indicates that the thermal degradation is delayed due to the higher activation energy it possesses. The overall results shows that the hybrid nanocomposite exhibits better properties compared to individual micro and nano composites.     

Synergistic modification of carbon fiber by electrochemical oxidation and sizing treatment and its effect on the mechanical properties of carbon fiber reinforced composites

In this article, The CF surface was modified by the synergistic modification of electrochemical oxidation and sizing treatment. Firstly, the electrochemical oxidation was carried out using fatty alcohol polyoxyethylene ether phosphate (AEOPK) as the electrolyte. The content of active groups on the modified CF surface increased by 235%. However, the strength of CF monofilament decreased due to the etching. Then, the electrochemically oxidized CFs were sized with the phosphate modified epoxy resin (PAEK). The etched defects on CF surface caused by the electrochemical oxidation were repaired by sizing agent molecules according to the AFM results. Furthermore, the spreadability of PAEK emulsion on the CF surface, the content of CF surface groups and the interaction of CFRC were characterized by using the monofilament contact angle, XPS and Raman spectroscopy. The results suggested that the synergistic modification could improve the CF surface activity, facilitate the spreading of PAEK on the CF surface, and increase the interaction between the CFs and the resin matrix. There were 20.3 and 22.6% enhancement in the breaking strength and elongation of CF monofilament. In addition, the interlaminar shear strength (ILSS) of CFRC prepared with synergistically modified CFs was increased from 12.81 to 33.04 MPa. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48028.     

改性聚芳醚酮增韧环氧树脂研究

以改性聚芳醚酮(PAEK)为增韧剂对环氧树脂进行改性。通过冷场发射扫描电镜分析和冲击强度测试研究了PEAK用量对PAEK/EPOXY浇注体冲击性能的影响及其增韧机理。结果表明,纯环氧和质量分数分别为5%、15%、25%、35%和50%的6种共混浇铸体的冲击强度分别为1.92 MPa、2.97 MPa、3.06 MPa、4.63MPa、4.69 MPa以及5.36 MPa,体系的冲击强度随PAEK含量增加而提高。随PAEK用量增加,PAEK/EPOXY共混体系主体呈现为海岛-双连续相-相反转逐步过渡微观结构,这影响了共混树脂体系的冲击裂纹扩展模式,从而使得冲击性能上升。     

“Ex situ” concept for toughening the RTMable BMI matrix composites,Part I: Improving the interlaminar fracture toughness

Aerospace‐grade bismaleimide matrix composites was toughened based on a novel ex situ resin transfer molding (RTM) technique using a special manufactured ES? carbon fabrics. The toughening mechanism and toughening effect by the technique are studied using thermoplastic PAEK as toughener. Mode I fracture toughness (G_IC) of the composites toughened by ex situ RTM technique increased up to three times higher than that of the control system, and Mode II fracture toughness (G_IIC) increased two times higher as well. The composite without toughening was denoted as control system. The microstructure revealed that a reaction‐induced phase decomposition and inversion happened in the interlaminar region, which resulted in a particles morphology that showed the thermosetting particles were surrounded with the PAEK phase. The plastic deformation and rupture of the continuous PAEK phase are responsible to the fracture toughness improvement. And the influence of PAEK concentration on toughness improvement was also investigated. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

New method for producing high-performance thermoplastic polymeric foams

A new method for the production of foamed thermoplastic polymers from blends of a poly(aryl ether ketone) (PAEK) and polyetherimide (PEI) is presented. The blowing agent for the foaming process is water which is produced at elevated temperatures in an extruder, via an in situ reaction between an amine end group on the PEI, and a ketone functionality on the backbone of the PAEK chain. The effect of composition, mixing, time, and temperature are investigated. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 1543–1550, 1997