聚醚醚酮纤维的发展现状与应用

综述了国内外聚醚醚酮(PEEK)纤维的研究发展现状;分析了制约我国PEEK纤维发展的原因;介绍了PEEK树脂的流变性能、纺丝技术;阐述了PEEK纤维的结构、物理化学性能及应用领域;提出我国应加大PEEK原料及其纤维的研发,实现PEEK纤维国产化。     

PEEK高强耐磨复合材料的制备与性能

采用微型注塑机制备了聚醚醚酮/玻璃纤维/碳纳米管(PEEK/GF/CNTs)复合材料,对PEEK/GF/CNTs复合材料的力学性能、导热性能、摩擦性能进行了研究。结果表明:室温(25℃)下,GF的加入使PEEK材料的拉伸强度提高了43.37%;随着温度的升高,PEEK及其复合材料的拉伸强度逐渐下降;随着CNTs用量的增加,PEEK/GF/CNTs复合材料的拉伸强度呈先增大后减小的趋势;在1 000N的载荷下,PEEK/GF/CNTs复合材料的耐摩擦性能最佳;CNTs的加入提高了PEEK材料的耐热性能;当CNTs质量分数为8%时,PEEK/GF/CNTs复合材料拉伸强度为168.64 MPa,导热系数为0.416 2 W/(m·K),结晶度为16.18%,综合性能最佳。     

聚醚醚酮/多壁碳纳米管复合材料力学及阻燃性能研究

通过熔融共混法将聚醚醚酮（PEEK）与多壁碳纳米管(MWCNT)混合,利用模压法制备了MWCNT增强型PEEK复合材料,研究了MWCNT对PEEK性能的影响。结果表明,添加一定比例的MWCNT能够提高PEEK的力学和阻燃性能;当MWCNT含量为5%（质量分数,下同）时,PEEK的弯曲强度提高了53%;当MWCNT含量为1%时,锥形量热法测得的热释放速率峰值最低,燃烧性能指数值最大,热重分析显示初始分解温度较纯PEEK提高了13℃,表明MWCNT有效地提高了PEEK的阻燃和热稳定性能。     

石墨烯和二氧化硅填料对聚醚醚酮性能的影响研究

通过熔融共混法制备了聚醚醚酮(PEEK)/碳基复合材料,比较了二氧化硅(SiO_2)和石墨烯纳米片(GNP)对PEEK性能的影响。结果表明:SiO_2堆积分布在PEEK基体中,而GNP在PEEK中形成了堆积片状结构;加入一定量的SiO_2和GNP均能有效提高PEEK的弹性模量,最大值分别为5.2 GPa和5.8 GPa;加入GNP可以有效提高PEEK复合材料的抗拉强度,而SiO_2的加入则会降低抗拉强度;随着SiO_2和GNP含量的增加,PEEK复合材料的弹性模量在不同温度下表现出不同的趋势;PEEK/SiO_2复合材料较PEEK/GNP复合材料具有较好的阻尼性能。     

特种工程塑料聚醚醚酮的热学改性

综述了特种工程塑料聚醚醚酮(PEEK)热学改性的研究现状及PEEK热性能的改性方法,指出各种改性方法的特点及其对改性体系热性能的影响;并探讨了不同改性方法影响PEEK热性能的微观作用机理。最后,指出聚芳醚酮类材料热学改性今后的发展趋势和研究方向。     

PEEK/GF/CNTs复合材料的制备及性能研究

采用模压法制备了PEEK/GF/CNTs复合材料,研究了复合材料的力学、电性能、导热、耐摩擦等性能。结果表明:当CNTs含量为8%时,PEEK/GF/CNTs复合材料的拉伸强度最大为80.63 MPa;其导热系数随着CNTs含量的增加而增加,当CNTs含量为10%时,导热系数最大,为0.354 8 W/(m·K);体积电阻率随着CNTs含量的增加而逐渐减小;当CNTs含量为8%时,PEEK/GF/CNTs复合材料摩擦系数最佳值为0.113;CNTs能有效阻止PEEK基体从PEEK/GF/CNTs复合材料表面翘起、剥落;CNTs的加入降低了PEEK的结晶性能。     

Cu粉粒径对PEEK/Cu导热复合材料性能的影响

以铜(Cu)粉为导热填料,采用模压法制备了聚醚醚酮(PEEK)/Cu导热复合材料,并研究了铜粉粒径对PEEK/Cu导热复合材料导热性能、力学性能及结晶性能的影响。结果表明:随着Cu粉粒径的增大,PEEK/Cu导热复合材料的力学性能逐渐下降;当Cu粉粒用量为30%、粒径为10μm时导热复合材料的导热系数达到最佳值0.396 W/(m·K),相比于纯PEEK提高了67.80%;熔融焓与结晶度随着Cu粉粒径的增大而逐渐减小,因而PEEK/Cu导热复合材料的结晶性能降低。     

汽车轻量化下聚醚醚酮迎来投资机遇

<正>聚醚醚酮(PEEK)是最耐高温的工程塑料之一,同时PEEK也是综合性能最好的塑料,其具有优异的耐高温性能、耐磨损性能,高力学强度,耐腐蚀,低蠕变,以及耐高温水蒸气的性能和优异的电性能。PEEK是20世纪70年代末研究开发成功的一种新型     

PEEK与CF/PEEK红外光谱检测及摩擦性能分析

为了了解掌握目前PEEK以及其增强复合材料的摩擦性能发展水平以及发展方向,本文对当前生产的PEEK以及CF/PEEK进行了基础性的研究和实验。首先采用红外线光谱测试了PEEK与CF/PEEK之间的成分差异。而后对材料进行了基础摩擦实验,分析了PEEK与CF/PEEK表面现象,由此对两者的摩擦机理及摩擦性能有了更进一步的升入了解。通过这些实验分析发现PEEK加入碳纤维之后吸收红外辐射引起的振动变化,以及PEEK和CF/PEEK的摩擦力矩与摩擦系数的变化趋势。对于今后PEEK的增强复合材料的研究具有指导意义。     

聚醚醚酮纤维的结构与性能

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。     

Effect of dihydroxydiphenyl ether on poly(ether ether ketone)

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 (T_d) 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 (T_g) and the melting temperature (T_m) 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.     

Spherulitic growth kinetics in miscible blends of poly(ether ether ketone) and poly(ether imide)

Growths of poly(ether ether ketone) (PEEK) spherulites from both pure melt and its miscible blends with poly(ether imide) (PEI) have been studied by polarized optical microscopy. The nucleation density of PEEK spherulites was depressed upon blending with PEI, which can be attributed to the reduction in degree of supercooling arising from equilibrium melting point depression. A modified Lauritzen-Hoffman (L-H) theory was adopted to analyze the growth kinetics. Regime III-II transition was observed with the transition temperature decreasing with increasing PEI composition. Assuming free rotations of the virtual bonds in PEEK molecule, the side surface free energy of 12.0 erg/cm² was calculated from the characteristic ratio. The fold surface free energy of 188 erg/cm² and work of chain folding of 12.3 kcal/mol were then obtained from the modified L-H analysis.     

复合成盐剂对聚醚醚酮合成与性能的影响

采用4,4′-二氟二苯甲酮、对苯二酚为原料,以不同比例的碳酸钾和碳酸钠为复合成盐剂,二甲苯为脱水剂,二苯砜为溶剂成功制备了一系列聚醚醚酮(PEEK)树脂。通过傅里叶红外光谱和X射线衍射对PEEK树脂结构进行了表征,证明合成的样品是对苯二酚型PEEK树脂。其次,对所制样品分别进行力学性能、特性黏度、热性能测试,详细地探讨不同钾/钠比例的复合成盐剂对PEEK性能的影响。结果表明,所有样品均展示了优异的力学性能和热性能,其熔点和初始分解温度分别大于330℃和520℃,拉伸强度介于77~101 MPa。此外,当碳酸钾和碳酸钠的物质的量比为7∶3时,PEEK树脂的综合性能达到最优。     

特种工程塑料PES、PEEK的成型加工特性

叙述了特种工程塑料的界定，详细叙述了特种工程塑料PES、PEEK的物理性能和优异耐热性，介绍了PES、PEEK在我国的应用开发研究、应用领域和一些典型的制品。着重论述了特种工程塑料PES、PEEK的加工特性和制品成型方法，对加工设备和加工工艺做了详细的论述，为PES、PEEK的成型加工提供了理论基础和经验指导。     

海洋环境下PEEK复合材料摩擦学研究进展

结合当前海洋装备的发展趋势,分析了海洋环境的特点,概述了国内外聚醚醚酮(PEEK)复合材料在海洋环境中的摩擦磨损研究及应用现状,着重介绍了PEEK与金属配副、PEEK与陶瓷配副、表面工程技术在PEEK作为关键摩擦副等在海洋环境下的摩擦学研究现状及发展趋势.     

PPS／PEEK熔融共混物DSC多次扫描研究

借助ＤＳＣ研究ＰＰＳ／ＰＥＥＫ共混物熔融时间，ＰＥＥＫ粒径及ＰＰＳ组分对共混物中ＰＥＥＫ结晶熔融行为的影响，结果表明，ＰＥＥＫ粒径由５００～１０００μｍ减小至２００～５００μｍ时，ＰＥＥＫ与ＰＰＳ相互作用增大，ＰＥＥＫ的结晶峰由单峰分裂为双峰，其高温结晶峰向高温移动，峰强随熔融时间延长而减弱，低温结晶峰向低温移动，峰强随熔融时间延长而增大，熔融时间延长时，退火后ＰＥＥＫ的低温熔融峰强增大，而高温熔     

Mechanical and Thermal Properties of Poly(phthalazinone biphenyl ether sulfone)/PEEK Blends

A series of blends with various compositions are prepared by melt extrusion on the basis of novel copoly(phthalazinone biphenyl ether sulfone) (PPBES) and poly(ether ether ketone) (PEEK). The melt flowability, mechanical and thermal properties of the blends are studied. The results show that the incorporated PEEK has a large influence on the melt viscosity and thermal stability of blends. The tensile strength of the blends remains at about 90 MPa at room temperature; PPBES improves the mechanical properties of PEEK at 150°C. The flexural strength and modulus of the PPBES/PEEK blends also increase with the addition of PEEK.     

Investigation on the crystallization behavior of poly(ether ether ketone)/poly(phenylene sulfide) blends

The morphology of nonisothermally crystallized poly(phenylene sulfide) (PPS) and its blend with poly (ether ether ketone) (PEEK) have been observed by polarized optical microscope (POM) equipped with a hot stage. The nonisothermal crystallization behavior of PPS and PEEK/PPS blend has also been investigated by differential scanning calorimetry (DSC). The maximum crystallization temperature for PEEK/PPS blend is about 15°C higher than that of neat PPS, and the crystallization rate, characterized by half crystallization time, of the PEEK/PPS blend is also higher than that of the neat PPS. These results indicate that the PEEK acts as an effective nucleation agent and greatly accelerates the crystallization rate of PPS. The Ozawa model was used to analyze the nonisothermal crystallization kinetics of PPS and its blends. The Avrami exponent values of neat PPS are higher than that of its blend, which shows that the presence of PEEK changed the nucleation type of PPS from homogeneous nucleation to heterogeneous nucleation. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Crystallization behavior and morphological characterization of poly(ether ether ketone)

The crystal structure and morphology of poly(ether ether ketone) (PEEK) was investigated using standard differential scanning calorimetry (DSC), flash DSC, optical microscopy, atomic force microscopy, and small angle X-ray scattering tools. The flash DSC results suggested that the double melting peaks phenomenon observed in conventional DSC work originated from the reorganization of PEEK crystals, which was due to the much faster recrystallization rate of PEEK than the DSC heating and cooling rate. A refined crystallization model to describe PEEK crystal structure formation was proposed. The refined crystallization model could help reconcile the discrepancy found between the bulk crystallinity measured by DSC and the linear crystallinity obtained from SAXS experiments by taking into account possible variation in crystal perfection within the lamellar structure. Simplified molecular dynamic modeling was carried out to support this model. Implications of the above findings to the fundamental understanding of structure–property relationships in PEEK were discussed.     

Crystallization and melting behavior of poly(ether ether ketone)/poly(aryl ether sulfone) blends

The crystallization and melting behavior of poly(ether ether ketone) (PEEK) in blends with poly(aryl ether sulfone) (PES) prepared by melt mixing are investigated by differential scanning calorimetry (DSC) and wide‐angle X‐ray scattering (WAXS). The presence of PES is found to have a notable influence on the crystallization behavior of PEEK, especially when present in low concentrations in the PEEK/PES blends. The PEEK crystallization kinetics is retarded in the presence of PES from the melt and in the rubbery state. An analysis of the melt crystallization exotherm shows a slower rate of nucleation and a wider crystallite size distribution of PEEK in the presence of PES, except at low concentrations of PES, where, because of higher miscibility and the tendency of PES to form ordered structures under suitable conditions, a significantly opposite result is observed. The cold crystallization temperature of the blends at low PES concentration is higher then that of pure PEEK, whereas at a higher PES concentration little change is observed. In addition, the decrease in heat of cold crystallization and melting, which is more prevalent in PEEK‐rich compositions than in pure PEEK, shows the reduction in the degree of crystallinity because of the dilution effect of PES. Isothermal cold crystallization studies show that the cold crystallization from the amorphous glass occurs in two stages, corresponding to the mobilization of the PEEK‐rich and PES‐rich phases. The slower rate of crystallization of the PEEK‐rich phase, even in compositions where a pure PEEK phase is observed, indicates that the presence of the immobile PES‐rich phase has a constraining influence on the crystallization of the PEEK‐rich phase, possibly because of the distribution of individual PEEK chains across the two phases. The various crystallization parameters obtained from WAXS analysis show that the basic crystal structure of PEEK remains unaffected in the blend. Further, the slight melting point depression of PEEK at low concentrations of PES, apart from several other morphological reasons, may be due to some specific interactions between the component homopolymers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2906–2918, 2003