共查询到20条相似文献,搜索用时 203 毫秒
1.
《化学进展》2018,(11)
聚醚醚酮诸多的优点(优良的机械性能、耐磨性能、耐化学性、良好的生物相容性、与人体骨接近的弹性模量、射线可透性、易加工及可重复消毒等)使其在骨科种植体的应用研究中成为替代不锈钢、钛合金、超高分子量聚乙烯等候选材料之一,但是,聚醚醚酮的生物惰性限制了其临床应用。为了获得良好的骨种植界面,通过在聚醚醚酮材料中制备孔隙结构,复合生物活性陶瓷和增强纤维等方法,使聚醚醚酮及其复合材料从生物惰性转变为生物活性。本文归纳了多孔聚醚醚酮、聚醚醚酮基二元复合材料和聚醚醚酮基三元复合材料的生物力学和生物活性的变化及其潜在的临床应用,为获得生物力学与人体骨相近且生物活性、生物相容性、生物安全性均优良的以聚醚醚酮为基体的骨移植材料提供理论依据,促进聚醚醚酮及其复合材料在骨移植中的广泛应用。 相似文献
2.
3.
聚合物电解质中离子输运机制的谱学研究 总被引:3,自引:0,他引:3
聚合物电解质是新一代锂离子电池所需要的重要材料,本文从分析聚丙烯腈增塑剂-LiClO4体系中各组份间的相互作用出发,用Raman光谱,红外光谱,X射线光电子能谱及核磁共振等谱学方法研究了聚合物电解质中各组份之间的相互关系和Li^+离子在聚合物电解质中的输运机理。 相似文献
4.
石墨、碳纤维和聚四氟乙烯(PTFE)填充的聚醚醚酮(PEEK)具有自润滑作用,是高性能的复合材料。采用热失重分析仪研究了聚醚醚酮及其复合材料的热降解行为,用Kissinger方法和Ozawa方法计算了复合材料的反应活化能(Ea)。与PEEK相比较,自润滑PEEK复合材料具有更高的降解反应活化能和更低的反应速率常数(K)。 相似文献
5.
6.
纳米无机粒子/聚合物复合材料界面结构的研究 总被引:1,自引:0,他引:1
纳米粒子具有许多特性,聚合物中加入纳米粒子可以制备得到性能更加优异的复合材料,其中纳米粒子和聚合物基体间的界面对决定纳米复合材料的性能起着重要作用.本文综述了近些年来表征纳米无机颗粒/聚合物复合材料中界面结构的研究手段,如红外光谱(FTIR)、热重(TGA)、电子显微镜、小角中子散射(SANS)及小角X射线散射(SAXS)等,及界面结构与复合材料力学性能和热稳定性关系的研究进展.同时也介绍了纳米粒子对复合材料的渗透、光催化、阻燃、介电及导电性能的影响.最后对这一领域的研究进行了展望. 相似文献
7.
8.
9.
含二联苯结构聚醚醚酮的微结构及磺化改性的性质研究 总被引:1,自引:1,他引:0
本文利用PEEK的AM1条件优化结果,并结合二联苯结构与不含二联苯结构聚醚醚酮的结构相似性,确定了含二联苯结构聚醚醚酮重复单元的最优构型,据此给出了此分子链的微观构型。在实验上也研究了磺化改性对此聚合物红外光谱的影响。 相似文献
10.
一种液晶共聚酯/粘土纳米复合材料的制备及其相转变温度 总被引:5,自引:0,他引:5
一些无机微粒被广泛用做聚合物的增强材料,其中特别引起人们注意的是一种粘土,即蒙脱土(montmorillonite).蒙脱土具有层状结构,其特点一是微粒尺寸小,二是可以和多种单体发生插层聚合反应,给出聚合物/蒙脱土纳米复合材料[1~3].纳米复合材料指的是其基质中分散相的尺寸至少有一维小于100nm数量级的复合材料.由于其纳米尺度效应、大的比表面积以及强的界面相互作用,纳米复合材料的物理力学性能优于相同组分常规复合材料.因此,无论从基本理论研究角度还是从应用角度上看,对聚合物纳米复合材料的研究都… 相似文献
11.
12.
吡啶-2-甲酸镍的合成及其晶体结构 总被引:1,自引:0,他引:1
以吡啶 2 甲酸和Ni(ClO4)2·6H2O为原料反应制得配合物[Ni(C5H4NCOO)2(H2O)2]2H2O,并通过X 射线衍射法测定其晶体结构.该化合物属于单斜晶系,空间群P21/n,晶胞参数:a=0.97351(15)nm,b=0.52254(8)nm,c=1.4483(2)nm,β=90.119(3)°,V=0.7367(2)nm3,Z=2,Dc=1.690g/cm3,μ=1.362mm 1,F(000)=388,结构偏离因子R1=0.0316,wR2=0.0902,共收集到4771个强度数据,其中1700个独立衍射点,1489个(I>2σ(I))可观测点.X 射线分析表明晶体是由分子间氢键和π π弱相互作用堆积而成的二维层状结构. 相似文献
13.
14.
Dawson结构 [(HOCH_2CH_2)_2NH_2]_6·P_2W_(18)O_(62)·6H_2O的合成、表征、晶体结构 总被引:1,自引:1,他引:0
由二乙醇胺与H6P2W18O62·nH2O合成了[(HOCH2CH2)2NH2]6·P2W18O62·6H2O(I).单晶结构解析结果表明晶体属三方晶系,空间群为R-3,晶胞参数:a=b=c=1.36298(16)nm,α=β=γ=106.490(17)°,Z=1,V=2.1374(4)nm3,R=0.0837,Rw=0.2219.化合物分子由一个P2W18O626 阴离子、六个质子化的二乙醇胺、六个结晶水组成.标题化合物具有可逆光色性.热分析表明,化合物阴离子在463℃左右分解. 相似文献
15.
Raman spectra of highly oriented pyrolitic graphite, multilayer graphene and multiwall carbon nanotubes are carried out at different laser powers and different excitation energies. The effects of the laser heating and the double resonance Raman scattering are investigated as a prerequisite for a correct interpretation of the Raman spectra of carbon materials-based composites. The Raman spectra of multilayer graphene and multiwall carbon nanotubes embedded in a silicone matrix are also analyzed in an attempt to get some insights into the polymer–filler interface. 相似文献
16.
A comparative study of carbon bonding states and Raman spectra is reported for amorphous diamondlike carbon films deposited using 120 fs and 30 ns pulsed laser ablation of graphite. The presence of sp(1) chains in femtosecond carbon films is confirmed by the appearance of a broad excitation band at 2000-2200 cm(-1) in UV-Raman spectra. Analysis of Raman spectra indicates that the concentrations of sp(1)-, sp(2)-, and sp(3)-bonded carbon are approximately 6%, approximately 43%, and approximately 51%, respectively, in carbon films prepared by femtosecond laser ablation. Using surface enhanced Raman spectroscopy, specific vibrational frequencies associated with polycumulene, polyyne, and trans-polyacetylene chains have been identified. The present study provides further insight into the composition and structure of tetrahedral carbon films containing both sp(2) clusters and sp(1) chains. 相似文献
17.
J. Li 《Surface and interface analysis : SIA》2009,41(4):310-315
In this work, ozone modification method and air‐oxidationwere used for the surface treatment of polyacrylonitrile(PAN)‐based carbon fiber. The surface characteristics of carbon fibers were characterized by XPS. The interfacial properties of carbon fiber‐reinforced (polyetheretherketone) PEEK (CF/PEEK) composites were investigated by means of the single fiber pull‐out tests. As a result, it was found that IFSS (interfacial shear strength) values of the composites with ozone‐treated carbon fiber are increased by 60% compared to that without treatment. XPS results show that ozone treatment increases the amount of carboxyl groups on carbon fiber surface, thus the interfacial adhesion between carbon fiber and PEEK matrix is effectively promoted. The effect of surface treatment of carbon fibers on the tribological properties of CF/PEEKcomposites was comparativelyinvestigated. Experimental results revealed that surface treatment can effectively improve the interfacial adhesion between carbon fiber and PEEK matrix. Thus the wear resistance was significantly improved. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
18.
19.
以二氧化钛(TiO2)纳米粉(P25)为原料,把它研磨成胶状,用涂敷法制得TiO2纳米多孔膜,并组装成太阳能电池,用100W氙灯作为模拟太阳光,对电池进行光电性能测试.根据电池的短路电流(Isc)、开路电压(Voc)和填充因子(ff)等指标来反映电池的性能.研究表明,分散剂乙酰丙酮、OP乳化剂、研磨时间和热处理后的保温时间长短对TiO2膜的性能均有很大的影响.其结果是,乙酰丙酮0.15mL、OP乳化剂0.10mL、研磨时间1h和保温时间0.5h时,TiO2膜的光电性能较好,Isc、Voc和ff分别为8.85mA、567mV和0.445.并用XRD和比表面及孔隙分析仪对TiO2膜进行了表征. 相似文献
20.
Continuous carbon fiber reinforced poly-ether-ether-ketone (CCF/PEEK) composites have attracted significant interests in mission-critical applications for their exceptional mechanical properties and high thermal resistance. In this study, we additively manufactured CCF/PEEK laminates by the Laser-assisted Laminated Object Manufacturing technique, which was recently reported by the authors. The effects of laser power and consolidation speed on the flexural strength of the CCF/PEEK composites were studied to obtain the optimal process parameters. Hot press postprocessing was performed to further improve the mechanical properties of the composites. Various fiber alignment laminates were prepared, and the flexural and tensile properties were characterized. The hot press postprocessing 3D printed unidirectional CCF/PEEK composites exhibited ultrahigh flexural modulus and strength of 125.7 GPa and 1901.1 MPa, respectively. In addition, the tensile modulus and strength of the composites reached 133.1 GPa and 1513.8 MPa. The results showed that the fabricated CCF/PEEK exhibited superior mechanical performance compare to fused filament fabrication (FFF) printed carbon fiber reinforced thermoplastics (CFRTP). 相似文献