聚醚酮酮和磺化聚醚酮酮物理性能的研究

研究了聚醚酮酮(PEKK)和磺化聚醚酮酮(SPEKK)的密度、吸水率、耐溶剂性能和电性能,用X—射线衍射研究了结晶度的大小,用差热分析、差示扫描量热分析和热失重法进行了热性能的研究,并对模压成型条件进行了探讨。与磺化聚醚酮酮相比,聚醚酮酮的密度略大,吸水率较小,耐溶剂性能好,结晶度大,熔点及热分解温度较高。     

聚醚酮酮的合成与性能研究

在温和条件下,以1,2-二氯乙烷为溶剂、无水三氯化铝为催化剂、二苯醚和对苯二甲酰氯为原料合成了高分子量的聚醚酮酮(PEKK),并找到了用浓盐酸脱除催化剂、乙醇提纯聚合物的有效途径。测试了PEKK的主要物理和化学性能,其中PEKK的特性粘度可达0.8～1.0,达到了工程材料的要求。     

离心静电纺丝法制备聚醚酮酮纳米纤维

用离心静电纺丝方法,将国产化的高性能工程塑料聚醚酮酮(PEKK)制备成PEKK纳米纤维。对PEKK离心静电纺丝的可纺性、纺丝规律以及最终纤维的性能进行了研究。结果显示,离心静电纺丝能很好解决溶液浓度高、溶剂挥发困难的问题,PEKK的离心静电纺丝可纺性很好,溶液浓度的控制对于纤维形貌和直径影响明显,纺丝纤维的热性能比原材料有所降低。该研究为PEKK纳米纤维的制备开辟了新方向。     

新型特种工程塑料聚醚酮酮的研究及应用进展

介绍了聚醚酮酮(PEKK)的合成方法,比较了不同合成方法的优缺点,同时对该聚合物的结构和性能特点进行了分析。综述了PEKK改性及PEKK基复合材料的研究进展,同时介绍了PEKK在航空航天和医学上的应用,指出制备性能优异的复合材料,是推广这种新型工程塑料的重要途径。     

高性能航天航空材料——聚醚酮酮

主要综述了聚醚酮酮(PEKK)的物理性能、合成方法和在航天航空领域的应用     

开展我国聚醚酮酮研究的建议

聚醚酮酮(PEKK)是继聚醚醚酮(PEEK)之后国外新开发的又一特殊结构型热塑性塑料。和PEEK比较,PEKK的玻璃化转变温度高10～12℃,拉伸模量高0.7GPa,断裂韧性虽低于PEEK,但和未增韧空间级环氧树脂比较则提高了10倍,用作碳纤维增强复合材料的基体树脂,具有很高的弯曲、剪切和压缩强度,而且对环境的适应性强,耐湿热性、耐燃性优良,有较高的极限氧指数,并具有较低的烟密度等。作者认为组织我国的技术力量,开发研究我国自己的这一具有上述引人注目特点的新型树脂——聚醚酮酮,以适应我国航空和宇航工业等高技术领域的需要,具有重要的意义。     

全球芳香酮聚合物市场需求将高速增长

据美国SRI咨询公司（SRIC）的最新研究报告显示，未来几年，全球芳香酮聚合物市场需求有望以年均8％的速度快速增长。芳香酮聚合物包括聚醚酮酮（PEKK）和聚醚醚酮（PEEK）。当前市场应用最为广泛的是PEEK，但PEKK比PEEK拥有更好的性能。     

亲电聚合路线合成含氯取代基的聚芳醚酮酮的研究

对苯二甲酰氯、2,5-二氯对苯二甲酰氯和二苯醚,在无水三氯化铝、1,2-二氯乙烷和N,N-二甲基甲酰胺存在下,通过傅-克(Friedel-Crafts)酰化缩合反应,合成了新型的含氯取代基的聚芳醚酮酮(简称PEKKC)。用红外光谱、X-射线衍射、扫描电镜、差示扫描量热、热失重及耐溶剂试验等对聚合物进行了表征。研究结果表明苯环上的氯取代基能显著降低聚合物的熔融温度、结晶度及表观形态的致密度,PEKKC具有和PEKK相似的耐热性及耐溶剂、抗化学腐蚀性。     

聚醚酮酮和磺化聚醚酮酮的热稳定性研究

用差热分析法,差示扫描量热法、换失重法,等热分析方法对聚醚酮酮和磺化聚醚酮酮的热稳定及其差异进行了研究,结果表明聚醚酮酮有更好的热稳定性。     

山东凯盛新材料股份有限公司聚醚酮酮(PEKK)高性能新材料成型加工项目完成竣工环境保护验收

<正>2019年10月13日,山东凯盛新材料股份有限公司公示了其聚醚酮酮(PEKK)高性能新材料成型加工项目竣工环境保护验收信息。据《聚醚酮酮(PEKK)高性能新材料成型加工项目竣工环境保护验收监测报告》,该项目需要的原辅材料为聚醚酮酮粗品879.13t/a,涂料助剂2.5t/a,改性造粒助     

静电纺丝制备聚醚酮酮超细纤维

用溶液静电纺丝方法制备了聚醚酮酮超细纤维,用扫描电子显微镜研究了实验过程中纺丝电压、纺丝距离、流量、纺丝液浓度对于聚醚酮酮纤维直径和形貌的影响,并对多个纺丝参数的影响规律进行了分析。实验结果表明,在一定条件下纺丝电压和纺丝距离对纤维直径影响较小,而流量和纺丝液浓度能显著影响纤维直径,在小流量、低浓度容易得到较细的纤维,并且纤维直径分布集中。     

Thermal conductivity and diffusivity of carbon-reinforced polyetherketoneketone composites

Heat transfer properties play an important role in processing of polyetherketoneketone (PEKK)/carbon fiber (CF) composites. Accordingly, thermal conductivity and diffusivity of PEKK, PEKK/glassy carbon (GC), and PEKK/CF composites have been studied. Observed increase in conductivity and diffusivity with carbon filler addition was analyzed using the Maxwell–Eucken model. PEKK/GC composites with low carbon fraction indicated good fitting experimental points of the model, indicating good dispersion of particles. For PEKK/CF composites, the thermal conductivity and diffusivity increase is a reflection of a decrease in porosity. Results as observed from the model points to a homogenous dispersion within the PEKK/CF composites as well. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47975.     

Effect of PEKK oligomers sizing on the dynamic mechanical behavior of poly(ether ketone ketone)/carbon fiber composites

Poly(ether ketone ketone) (PEKK)/unidirectional carbon fiber (CF) composites have a poor interface. Accordingly, PEKK oligomer (PEKKo) sizing with a chemical compatibility with PEKK is proposed for promoting interfacial interactions in order to enhance mechanical performances. The thermal stability until 500 °C has been shown by thermogravimetric analysis (TGA). In order to compare static and dynamic sizing methods, “lab sizing” and “pilot sizing” were carried out. Scanning electron microscopy images of freeze fractures of PEKK/unsized CF, PEKK/PEKKo lab-sized CF and PEKK/PEKKo pilot-sized CF show that the PEKKo sizing causes an improvement of fiber/PEKK interactions, regardless of the sizing method. Indeed, in both cases, there is a continuity of matter at the interface while we observe a poor wetting of CF by matrix in PEKK/unsized CF. Dynamic mechanical relaxations in shear were analyzed as a function of temperature. The increase of storage modulus upon sizing is observed for both methods but it is more important for PEKKo pilot sizing. In the same way, the mechanical energy loss increases, it reflects the optimization of stress transfer between matrix and fibers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48818.     

Morphology and dynamical mechanical properties of poly ether ketone ketone (PEKK) with meta phenyl links

Poly ether ketone ketone (PEKK) with different proportion of meta phenyl links were investigated by combining differential scanning calorimetry and dynamic mechanical analysis. The influence of the Terephthalyl/Isophthalyl isomers (T/I) ratio on the vitreous phase is mild, the shift of the glass transition is limited to a few degrees and the vitreous G′ is only sensitive to the content of the crystalline phase. Contrarily, the increase of meta isomers is responsible for a significant decrease of the melting temperature (T_m) by 60 °C, which considerably facilitates processing. The modification of interchain interactions in the crystalline phase might be implied. A series of thermal protocols evidenced that the difference of crystallization behavior is also dependent upon the T/I isomer ratio. A time and temperature dependence of annealing on the double melting behavior of PEKK was observed. Regarding the mechanical behavior, the observed reinforcing effect due to the crystalline phase was more prominent in the rubbery state than in the glassy state. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43396.     

Controlling Crystallization: A Key Factor during 3D Printing with the Advanced Semicrystalline Polymeric Materials PEEK,PEKK 6002, and PEKK 7002

Controlling the crystallization of advanced, high-performance polymeric materials during 3D printing is critical to ensure that the resulting structures have appropriate mechanical properties. In this work, two grades of polyetherketoneketone (PEKK 6002 and PEKK 7002) are used to print 3D specimens via a fused filament fabrication process. The samples are compared with polyetheretherketone printed under the same conditions. Two approaches for controlling the crystallization process are undertaken. The first involves adjustment of the chamber temperature between room temperature and 190 °C to create two regions where crystallization is governed by the slow diffusion process and elevated by limiting the nucleation process. The second approach involves selection of PEKK materials with varying crystallization kinetics, namely. Application of this method into 3D-printing process allows for printing semicrystalline materials with tailored mechanical, thermal, and chemical properties as either amorphous or in situ crystallized products. The studies undertaken here provide the basis to eliminate expensive and time-consuming post-processing of 3D fabricated parts. In particular, solutions for the avoidance of poor adhesion to the building plate and weak interlayer adhesion that can lead to warping are described. The materials are divided into three groups, slow, moderate, and too fast crystallization kinetics.     

加工温度与助剂对聚碳酸亚丙酯热降解性影响

通过特性黏度法研究加工温度与助剂对聚碳酸亚丙酯(PPC)热降解性的影响,并采用凝胶渗透色谱法评价特性黏度法结果的可靠性。结果表明:PPC对温度敏感,温度升高,特性黏度变低,相对分子质量变低。当加工温度从120℃升高到160℃,PPC的特性黏度从2.16 dL/g下降到1.31 dL/g,继续升高到200℃时,特性黏度从1.31dL/g下降到1.18 dL/g,说明温度越高,PPC特性黏度越低,热降解加剧,在120—160℃下降解速率较在160—200℃下快。在加工温度为140℃时,PPC的特性黏度为1.62 dL/g,PPC/MAH和PPC/AO1010的特性黏度比PPC的特性黏度分别提高了0.65 dL/g和0.25 dL/g,说明封端剂MAH、热稳定剂AO1010的加入能抑制PPC的热降解,提高PPC的热稳定性。采用特性黏度法研究PPC热降解的方法是可行的,且经济、方便、快捷,是研究PPC热降解性、可实现在线分析的一种良好方法。     

Synthesis and characterization of 4,5‐bis(4‐fluorobenzoyl)‐1‐methylcyclohexene and its polyethers

A new difluoride 4,5‐bis(4‐fluorobenzoyl)‐1‐methylcyclohexene (DFKK) has been prepared with fumaryl chloride, fluorobenzene, and 2‐methyl‐1,3‐butadiene as starting materials through two steps of reactions. This DFKK monomer undergoes reaction with 2,2‐(p‐hydroxyphenyl)‐iso‐propane (BPA) in the presence of excess anhydrous potassium carbonate in sulfolane to give a high molecular weight reactive poly(ether ketone ketone) (PEKK) that is very soluble in solvents such as chloroform and N,N‐dimethylformamide at room temperature, has glass transition temperature of 182°C, and is easily cast into flexible and bale ivory film with tensile strength of 64 MPa. The 5% weight loss temperature is 407°C. Ring‐closing reaction of PEKK with hydrazine gives cyclized PEKK (CPEKK) with improved thermal stability and reduced solubility. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1866–1871, 2002; DOI 10.1002/app.10454     

Effect of processing parameters on flexural properties of 3D-printed polyetherketoneketone using fused deposition modeling

Polyetherketoneketone (PEKK) is an engineering plastic with ultrahigh mechanical performance and has attracted considerable attention in the medical and technical fields. Printing parameters during fused deposition modeling (FDM) for PEKK have a significant impact on final part quality. In this study, a relationship between the process parameters and flexural properties of PEKK was investigated by conducting three-point bending tests, and scanning electron microscopy was employed to analyze the microstructure of fracture surfaces. Nozzle temperature, layer thickness, and infill density affected flexural properties by changing the porosity and interlayer bonding strength. Interlayer separation is the main failure mode of the upright orientation samples, while intralayer failure is likely to occur in the on-edge orientation samples. The flexural properties of FDM-printed PEKK under optimum parameters are comparable to those of mandibular bones, indicating that PEKK is a potential candidate for repairing mandibular defects. The results highlighted in this study are fundamental to the optimal design of complex ultralight, highly efficient structures.