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1.
联苯聚醚醚酮酮的合成与性能研究 总被引:9,自引:0,他引:9
用亲核取代路线合成了含亚联苯结构的新型聚醚醚酮酮(联苯PEEKK),并对其基本性能进行了测定。结果表明,联苯PEEKK的Tm比聚醚醚酮(PEEK)高77℃,其Tg比PEEK的高41℃,且保持了良好的力学性能,本文还对联苯PEEKK的晶体结构进行了初步探讨。 相似文献
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根据Flory热力学统计理论和比容-熔融热作国法,由DSC结果得到了不同联苯含量的聚醚醚酮酮-含联苯聚醚醚酮酮(PEEKK-PEBEKK)共聚物的熔融热,两种方法获得的结果吻合。在此基础上给出了PEEKK-PEBEKK共聚物不同联苯含量的熔点计算表达式。结果还表明,随着联苯含量nB,的变化,明显改变;当nB=0.35时,PEEKKPEBEKK共聚物的值最小。 相似文献
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聚醚醚酮酮等温结晶动力学的研究陈艳,王军佐,曹俊奎,那辉,吴忠文(吉林大学化学系,长春,130023)关键词聚醚醚酮酮,等温结晶动力学,差示扫描量热法聚醚醚酮酮(PEEKK)是在聚醚醚酮(PEEK)基础上开发成功的一种耐热高分子材料。它保持了PEEK... 相似文献
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一种含联苯的聚醚醚酮酮 总被引:7,自引:1,他引:6
聚醚醚酮酮(PEEK)是聚芳醚酮典型品种之一。由于它具有热固性塑料的耐热性,化学稳定性,又具有热塑性塑料的成型加工性,尤其是它的耐高温特性,使它在电子电器,机械仪表,交通运输宇航等领域得到应用。PEEK的T_g=143℃,T_m=334℃。我们用联苯二酚代替对苯二酚,同时加入间位的二氟化物。得到T_g=169℃,T_m=339℃的含联苯的聚醚醚酮酮。它有可能成为使用温度高于PEEK而加工条件与PEEK基本相同的耐高温树脂。 相似文献
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聚醚醚酮(PEEK)具有突出的耐高温水解和耐辐照性能以及良好的断裂韧性,现已在核能、宇航等高技术领域得到应用。研制新型聚芳醚酮是目前十分活跃的课题。本文采用亲核取代路线,以对苯二酚、联苯二酚、4,4′-二氟二苯酮为单体合成了一系列含亚联苯结构的新型聚芳醚酮,并对基基本性能进行了测定。 相似文献
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含联苯结构聚醚醚酮酮共聚物和共混物的制备及性能研究 总被引:8,自引:0,他引:8
聚醚醚酮(PEEK)是八十年代初投入市场的全芳香结构热塑性耐高温特种工程塑料,它的7’。一143“C,Tm一334C“‘,最大结晶度为48%,典型制品结晶度为20%~30%[”.PEEK可用通常的设备成型,其制件、纤维、涂料及复合材料在电子电器、机械设备、交通运输、宇航、原子能工程、军事等领域有广泛的用途[’j.聚醚醚酮酮(PEEKK)是继PEEK之后,由德国Hoechst公司开发出来的又一种全芳香结构热塑性耐高温特种工程塑料[‘j.为了研究该类聚合物的结构和性能的关系,我们在实验室中合成了PEEKK和含联苯结构聚醚醚酮酮(PE-*… 相似文献
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酚类在聚醚醚酮上的分离行为研究于剑锋,吴通好,孙家(吉林大学化学系,理论化学研究所,长春,130023)关键词:气相色谱固定相,聚醚醚酮,分离,酚类化合物聚醚醚酮[Poly(ether-ether-ketone),简称PEEK]是近年来推出的一种新型... 相似文献
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聚醚醚酮酮结晶度研究刘天西,王尚尔,张宏放,莫志深(中国科学院长春应用化学研究所高分子物理联合开放研究实验室长春130022)那辉,王军佐,吴忠文(吉林大学化学系长春)关键词聚醚醚酮酮,广角X射线衍射,结晶度新型特种工程塑料聚醚醚酮酮(PEEKK)具... 相似文献
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聚醚醚酮微结构及反应特性的量子化学研究 总被引:1,自引:1,他引:1
利用AM1对聚醚醚酮重复单元进行条件优化,得出了此分子的最优构型,明确了聚醚醚酮分子链的微观构象,并在此构象基础上进行量子化学计算,给出了健序、净电荷、前线轨道等信息,从理论上研究了聚醚醚酮的磺化反应及热分解反应的一些特性. 相似文献
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Rui Ma Luqian Weng Lin Fang Zhongkuan Luo Shenhua Song 《Journal of Sol-Gel Science and Technology》2012,62(1):52-56
Nano-hydroxyapatite (HA) particles were prepared by a sol–gel method and polyetheretherketone (PEEK) composite materials containing
a various amount of lab-prepared HA fillers had been successfully synthesized via an in situ synthesis process. The materials
structure was characterized by infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and
energy dispersive X-ray spectroscopy and the mechanical performance was investigated by a tensile strength test. The tensile
strength of HA/PEEK composites reaches an optimal 108 MPa at 6.1% HA content. The composites with HA content below 17.4% exhibit
a plastic break mode, while a brittle break mode above 17.4%. The results exhibit that the strong bonding between hydroxyapatite
fillers and PEEK matrix has been achieved. And it was proved that this strong bonding may be mainly attributed to the physical
factors, such as mechanical interlock between PEEK molecules and HA surface. The study clearly demonstrates that in situ synthesized
HA/PEEK composite materials have the potential for use as an alternative material for hard tissue replacement. 相似文献
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用WAXD、SEM及力学性能测试等研究热致液晶/PEEK/嵌段共聚物三元共混体系形态、结构和性能。结果表明嵌段共聚物的加入,使体系具有一定的相容性和较好的界面粘接,共混物的强度、模量有一定的提高,对共混物的结晶行为具有明显的影响,当热致液晶含量高时,基材与液晶两相间出现明显的分离现象,即“皮-芯”结构. 相似文献
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ZHOU Zheng ZHOU Fu-gui ZHANG Shu-ling MU Jian-xin YUE Xi-gui WANG Gui-bin 《高等学校化学研究》2012,28(5):907-911
Two types of antioxidants(a primary antioxidant and a secondary antioxidant) were used to improve the stability of poly(ether ether ketone)(PEEK). The effects of the antioxidants on the properties of PEEK and the stabilization mechanism were investigated by some characterization methods, such as rheometer, thermogravimetric ana- lysis(TGA), universal tester and electron spin resonance(ESR). The results indicate that the efficiency of the phosphorous antioxidant(DS) in improving the stability of PEEK was better than that of the phenolic antioxidant(DN) in both melting stability and thermal stability, and the thermal stability of PEEK sample containing 0.07%(mass fraction) DS was the best among all the samples due to the decrease of the free radicals density, as proven by ESR measurement. Additionally, no obvious changes could be observed in mechanical properties of PEEK containing antioxidants compared to those of virgin PEEK. 相似文献
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Jozef Lustoň Juraj Kronek Angela Kleinová Ivica Janigová Helena Valentová Jan Nedbal 《Journal of polymer science. Part A, Polymer chemistry》2012,50(19):3936-3943
A monomer of the AB‐type and a bifunctional comonomer of the AA‐type containing two 2‐oxazoline rings and a biphenyl structural unit were prepared from the corresponding carboxylic acids via their esterification and subsequent amidation with an aminoalcohol. The cyclization of an amide to 2‐oxazoline structure was achieved by treatment with thionyl chloride followed by liberation of the free base with sodium hydrocarbonate in an aqueous solution. The prepared monomers were used for the polyaddition polymerization of the AB‐type monomer having a 2‐oxazoline and phenol group bound on adjacent rings of the biphenyl structure in solution. The monomer of the AA‐type was used for AA+BB‐type polyaddition reactions with aliphatic dicarboxylic acids. Both types of polymerizations have been performed in melt and in solution. The structures of the polymers were determined, and the thermal properties of the polymers were evaluated. Liquid‐crystalline (LC) structures of the prepared polymers were observed by DSC measurements and optical microscopy. The polyaddition reactions of the monomers containing a 2‐oxazoline ring and a biphenyl unit represent a new efficient way for the preparation of a biphenyl unit containing poly(ether amide)s and poly(ester amide)s. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 相似文献
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Relevant secondary interactions (hydrogen-bond type), additional to the main anion-exchange mechanism, were found when a method for As, Se and Cr speciation was developed based on microLC-inductively coupled plasma mass spectrometry (ICP-MS) coupling. In order to get the claimed analytical performance characteristics of the microbore columns, microLC systems are equipped with very narrow bore fused silica capillaries. When a mobile phase of NH(4)NO(3) at pH 8.7 was used, a notable tailing was observed for As(III), As(V), MMA and Se(IV), species containing hydroxyl groups in its chemical structure at this pH value. However, additional interactions appeared neither when the fused silica capillaries of the capillary LC system were substituted for polyetheretherketone (PEEK) nor operating at pH below 8.5. A mechanism to explain the additional interaction observed is proposed and tested in this work. It seems that high pH values produce a partial hydrolysis of the siloxane groups of the fused silica capillaries. Under these conditions, degradation products of silica, containing ionized silanol groups, reach the column and interact with the anion-exchange resin. Then, ionized silanol groups, retained on the column, can interact with the hydroxyl moiety of the aforementioned analytes leading to severe peak tailing and broadening. Different strategies were evaluated to solve the problem. The addition of a salt containing hydroxyl groups in the mobile phase such as hydrogen phosphate, the diminution of the pH and the use of PEEK capillaries in the microHPLC system demonstrated to be suitable. Finally, two alternative microHPLC-ICP-MS separations, based on a gradient elution of NH(4)NO(3) at pH 8.0 and NH(4)NO(3)/NH(4)H(2)PO(4) at pH 8.7, were optimized and compared. Results showed better peak shapes for some species when hydrogen phosphate was added to the mobile phase. 相似文献
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Wen Qian Wenlong Li Charles Nguyen Tyler J. Johnson Joseph A. Turner 《Journal of polymer science. Part A, Polymer chemistry》2020,58(11):1544-1552
Understanding the internal structure and organization of semicrystalline polymers, especially at the nanoscale, has many challenges for researchers to date. In this article, we demonstrate a quantitative method for investigating the local viscoelastic properties (i.e., storage and loss moduli, as well as loss tangent) of semicrystalline polyether-ether ketone (PEEK) through the combination of contact resonance atomic force microscopy (CR-AFM) and in situ local heating with a thermal probe. Furthermore, the local viscoelastic properties of the crystalline and amorphous phases were decoupled by performing thermal CR-AFM array mapping near the glass transition temperature of PEEK (Tg, 143 °C). A distinct bimodal distribution of tip-sample interaction was observed for PEEK near its Tg, providing a means to estimate the Tg and the degree of crystallinity of PEEK. 相似文献
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Mechanical performance and in vivo bioactivity of functionally graded PEEK–HA biocomposite materials
Rui Ma Lin Fang Zhongkuan Luo Luqian Weng Shenhua Song Ruisheng Zheng Hongyuan Sun Huide Fu 《Journal of Sol-Gel Science and Technology》2014,70(3):339-345
A functionally graded material (FGM) of polyetheretherketone (PEEK)–hydroxyapatite (HA) with a symmetrical three-layer structure containing 8.7, 2.6 and 8.7 vol% HA, respectively, is successfully fabricated by hot pressing and evaluated by scanning electron microscopy and tensile testing. A good bonding between the HA particles and the PEEK matrix is achieved by virtue of an in situ method in fabricating each PEEK–HA composite layer. There are no apparent microcracks and microscopic interfaces within each layer of the FGM. The symmetrical PEEK–HA FGM does not fall apart or delaminate during loading with a tensile strength of 86.2 MPa, and its fracture energy is 56.5 kJ/m2. Furthermore, in vivo bioactivity of the FGM sample is also evaluated, showing that it has sound biocompability and bioactivity. Accordingly, the FGM in the future may be a promising biomaterial to be used as replacement implant of human bone through a proper design to balance mechanical properties and bioactivity. 相似文献
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Zheng Zhou Shuling Zhang Jianxin Mu Xigui Yue Zhenghua Jiang Guibin Wang 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(7):571-577
Two types of antioxidants (a phenolic antioxidant and a phosphorous antioxidant) were used to improve the stability of poly (ether ether ketone) (PEEK). To evaluate the effect of the antioxidants on the properties of PEEK and the stabilization mechanism, some characterization methods were carried out, such as rheometer, TGA, and electron spin resonance (ESR). The results indicated that the efficiency of the phosphorous antioxidant (DS) in improving the stability of PEEK was better than that of the phenolic antioxidant (DN) and the thermal stability of PEEK sample containing 0.07 wt% DS was the best among all samples due to the decrease of the free radicals density, as proven by ESR measurement. The possible stabilization mechanism of the antioxidants to PEEK was proposed to reveal the reason that caused the different performances of the two types of antioxidants to PEEK. 相似文献
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Feifei Pu Yihan Yu Zhicai Zhang Wei Wu Zengwu Shao Chao Li Jing Feng Longjian Xue Fengxia Chen 《Macromolecular bioscience》2023,23(9):2300032
Polyetheretherketone (PEEK) can potentially be used for bone repair because its elastic modulus is similar to that of human natural bone and good biocompatibility and chemical stability. However, its hydrophobicity and biological inertness limit its application in the biomedical field. Inspired by the composition, structure, and function of bone tissue, many strategies are proposed to change the structure and functionality of the PEEK surface. In this review, the applications of PEEK in bone repair and the optimization strategy for PEEK's biological activity are reviewed, which provides a direction for the development of multifunctional bone repair materials in the future. 相似文献