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。     

国内外特种工程塑料聚芳醚酮的生产、应用及发展前景

首先介绍了特种工程塑料聚芳醚酮的性能、生产工艺路线及发展历程,分析了国内外树脂生产厂家的技术现状及产品特点,列举了聚芳醚酮的应用领域,更进一步分析了国内外新品种的发展趋势,最后结合实际展望了聚芳醚酮的应用开发方向。     

含芘聚芳醚酮、制备方法及在单壁碳纳米管/聚醚醚酮复合材料中的应用

<正>公开号:CN104725630A公开日:2015-06-24申请人:吉林大学摘要:一种含芘聚芳醚酮、制备方法及其在改性单壁碳纳米管/聚醚醚酮复合材料中的应用,属于高分子材料制备技术领域。首先利用含硼酸酯的聚芳醚酮与1–溴芘单体在四(三苯基膦)钯催化下反应制备含芘聚芳醚酮;接着,利用含芘     

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。     

高性能聚芳醚酮的发展及应用

综述了聚醚酮、聚醚醚酮、聚醚醚酮酮、聚醚酮酮、聚醚酮醚酮酮等5类高性能聚芳醚酮的性能、合成方法及其改性研究进展等,并介绍了聚芳醚酮的应用情况,指出聚芳醚酮的发展趋势是通过开发新的合成技术或者改性途径,在不影响其主要性能的前提下降低生产成本.     

氯甲基化/季铵化新型聚芳醚砜酮超滤膜的研制

本文对含二氮杂萘结构聚芳醚砜酮进行改性制得氯甲基化聚芳醚砜酮。选用N-甲基一2-吡咯烷酮作制膜溶剂，依据正交设计方法制得了一系列氯甲基化聚芳醚砜酮超滤膜。考察了聚合物浓度、添加剂种类和添加量以及制膜蒸发时间等对膜性能的影响。将氯甲基化聚芳醚砜酮超滤膜浸入三甲胺溶液进行季铵化反应，得季铵化聚芳醚砜酮超滤膜。并考察了膜的抗污染性。     

含三苯基磷结构双酚A型聚芳醚酮的合成与表征

以环丁砜为溶剂,由双（4-（对氟苯甲酰基）苯基）苯基氧化膦和双酚A通过亲核缩聚反应合成了主链含磷聚芳醚酮。采用红外光谱和核磁共振等方法对产品的结构进行了表征,研究了磷基团的引入对聚芳醚酮的电性能、力学性能、耐热性、阻燃性和溶解性的影响。结果表明,磷基团的引入对聚芳醚酮的阻燃性能起到了较明显的提高作用,降低了聚合物分子链的规整性,减小了分子间的相互作用,改善了聚芳醚酮的溶解性能,使其在室温下可溶于CH2Cl2,CHCl3等多种极性溶剂。     

杂萘联苯聚芳醚酮的表面化学改性及成骨活性

为了解决生物骨植入材料杂萘联苯聚芳醚酮(PPEK)生物活性较差的问题,采用化学方法对PPEK进行改性,得到了羟基化改性PPEK和磺化改性PPEK.通过溶液旋涂的方法把两种改性聚合物涂覆在PPEK薄片表面,分别得到表面羟基化的PPEK样品(PPEK-OH)和表面磺化的PPEK样品(PPEK-SO3H).用X射线光电子能谱...     

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。     

世界特种工程塑料发展现状

当前,已工业生产的特种工程塑料品种很多,其主要品种为聚芳酯、聚苯酯、聚砜(含聚芳砜和聚醚砜)、聚苯硫醚、聚酰亚胺(含聚醚酰亚胺和聚酰胺酰亚胺等)、液晶聚合物和聚芳醚酮(含聚醚酮、聚醚醚酮、聚硫醚酮、聚硫醚醚酮)等特种工程塑料的发展历史至今不足40a,但因其性能优异,发展速度很快,已成为机械、电子、汽车、航空、航天和尖端技     

Enhancing the cell affinity of macroporous poly(L‐lactide) cell scaffold by a convenient surface modification method

In this study, the macroporous poly(L ‐lactide) (PLLA) cell scaffold was modified for enhancing its cell affinity by an improved surface‐treating medium, a mixture of aqueous 0.25 M NaOH/ethanol. Ethanol was applied as a co‐treating medium to wet the polylactone and assist the hydroxide nucleophilic attack on the ester bond. Low concentration of NaOH could be applied, severe bulk degradation could be avoided and the residual alkali was easy to remove. Treating time could also be shortened. After treatment under optimal conditions, the surface hydrophilicity and surface energy of PLLA were improved significantly and the surface roughness was also changed. Modification of the spherulite structure on PLLA surface was observed with the treating time using a computer‐assisted image analysis system (CAIAS). The results of gel permeation chromatography measurements indicated that only the outer layer of the PLLA was modified and the bulk properties were not altered. Mouse 3T3 fibroblasts culture results indicated that the improved surface‐treating medium was effective and convenient for enhancing the cell affinity of PLLA cell scaffold. Copyright © 2003 Society of Chemical Industry     

Comparison of fibroblast and nerve cells response on plasma treated poly (L‐lactide) surface

Plasma technique can easily be used to introduce desired functional groups or chains onto the surface of materials, and so it has a special application to improve the cell affinity of polymers surfaces. The purpose of this study is to elucidate the interaction between the cells and the surface of crystalline poly (L ‐lactide) (PLLA) samples, which were modified using a low‐temperature plasma treatment apparatus. The plasma treatments were carried out in the carbon dioxide (CO₂) gas. The results showed that the contact angle of the samples, which was plasma treated in CO₂ gas, decreased compared with that of the untreated samples. The hydrophilicity increased because of the introduction of oxygen‐containing functional groups onto the PLLA surfaces according to the spectroscopy for chemical analysis. High quantities of ? C? O groups, such as hydroxyl and carboxyl could be in corporate into the surface of PLLA. The surface wettability, topography, and chemistry of treated PLLA samples were characterized by contact angle measurement, scanning electron microscope (SEM), and ATR‐FTIR spectroscopy. The origin and plasma‐treated samples were used to investigate the interaction of two different types of cells namely, B65 glial nervous, and L929 fibroblast cells. The nervous cell response on the PLLA plasma treated in the CO₂ gas were significantly superior to that of the L929 fibroblast cells and untreated one. The surface modification technique used in this study may be applicable to tissue engineering for the improvement of nerve tissue compatibility of polymer and scaffold‐type substrates. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Cell surface properties of the demulsifying strain Alcaligenes sp. S-XJ-1 governing its behavior in oil–water biphasic systems

Bacterial behavior in oil–water biphasic systems plays an essential role in hydrophobic contaminant degradation, oil recovery, and emulsion breaking. Less is known about the cell surface properties that govern their behaviors in oil–water biphasic systems. In this study, biphasic partitioning and aggregation of a demulsifying strain of Alcaligenes sp. S-XJ-1 were experimentally measured and evaluated based on the cell surface properties of surface charge, surface free energy, and cell surface hydrophobicity (CSH). The S-XJ-1 was cultivated with five different carbon sources, and the results showed a highly varied partitioning, aggregation behavior, and cell surface properties. The calculated interaction energies, based on the cell surface properties, were consistent with the results of their behavior. Among the cell surface properties, the electron-donor character (γ^?, range 8.8–57.0 mJ/m²), which correlated well with CSH (ΔG_bwb), was an essential indicator of cell behavior. A low γ^? value enhanced the cell–interface and cell–cell interaction energies, which promoted cell partitioning and aggregation eventually leading to demulsification. The results and analysis provide important information for researchers concerned with cell–cell and cell–interface interactions.     

Wettability and osteoblastic cell adhesion on ultrapolished commercially pure titanium surfaces: the role of the oxidation and pollution states

The oxidation state of the surfaces of titanium-based biomaterials strongly depends on their previous history. This factor affects the titanium wettability and it probably conditions the success of the implanted biomaterials. However, the separate role of the pollution and oxidation states of metallic titanium surfaces remains still controversial. To elucidate this, it is required to standardize the initial surface state of titanium in terms of roughness and surface chemistry, and then, to monitor its wettability after the corresponding treatment. In this work, we studied finely polished surfaces of commercially pure titanium (cpTi) which were subjected to cleaning surface treatments. X-Photoelectron spectroscopy was used to characterize the surface chemistry and the oxide film thickness. The contact angle hysteresis in underwater conditions was measured with the growing/shrinking captive bubble method, which allowed for mimicking the real conditions of implantable devices. The water wettability of smooth cpTi surfaces was stabilized with weak thermal oxidation (230?°C, 30?min). The osteoblastic cell response of the stabilized and non-stabilized cpTi surfaces was analyzed. Although the oxidation and pollution states were also stabilized and normalized, no correlation was observed between the stable response in wettability of titanium and its cell adhesion.     

The influence of collector and bacterial cell surface properties on the deposition of oral streptococci in a parallel plate flow cell

Abstraet-The deposition of two strains of oral streptococci on collector surfaces with different surface free energies has been studied in a parallel plate flow cell at various buffer concentrations. One of the strains, Streptococcus salivarius HB, was characterized by the presence of proteinaceous surface appendages with lengths between 72 and 178 nm; whereas S. salivarius HB-C12, a spontaneous mutant of S. salivarius HB, was devoid of all surface appendages. Large differences were observed between the deposition rates of the two strains which were not predicted by theoretical calculations based on the convective diffusion equation using a DLVO-type potential function. This difference was attributed to the influence of the surface appendages of S. salivarius HB, which were absent on the mutant strain S. salivarius HB-C12. Furthermore, an additional attractive interaction, not accounted for in the DLVO theory, was needed in order to match the experimental deposition rates on the low surface free energy collector surfaces with theoretical predictions.     

Surface modification of non‐woven poly (ethylene terephthalate) fibrous scaffold for improving cell attachment in animal cell culture

BACKGROUND: The development of carriers with biocompatible surfaces are required to meet the needs in animal cell culture. In this work, poly (ethylene terephthalate) (PET) fibrous scaffold surfaces were chemically modified to introduce diethylaminoethyl (DEAE) groups. A packed‐bed bioreactor with DEAE‐conjugated PET fibrous scaffolds was investigated for continuous production of HBsAg by r‐CHO cells. RESULTS: The changes of surface properties were characterized by surface hydrophilicity, Attenuated total reflectance (ATR) analysis, element measurement, and scanning electron microscopy. The results showed that this treatment could improve surface hydrophilicity and roughness. Using an r‐CHO cell line as model cells, the feasibility of the DEAE‐conjugated PET fibrous scaffold in animal cell culture was evaluated by means of cell attachment efficiency measurement, MTT (3‐(4,5)‐dimethylthiathiazo(‐z‐yl)‐3,5‐di‐phenytetrazoliumromide) assay, and scanning electron microscopy observation. Enhancement of cell attachment and proliferation was exhibited in the cell culture on DEAE‐conjugated PET fibrous scaffolds. r‐CHO cells were cultured for continuous HBsAg production in a packed‐bed bioreactor with DEAE‐conjugated PET fibrous scaffolds. A cell density of 1.2 × 10⁷ cells mL^?1 working volume, cell viability of 92.8% and maximum HBsAg concentration of 3.1 mg L^?1 were achieved. CONCLUSION: The packed‐bed bioreactor system with DEAE‐conjugated PET fibrous scaffolds has the potential for industrial animal cell culture application. Copyright © 2008 Society of Chemical Industry     

Uniform Thin Film Electrodeposition onto Large Circular Wafer Substrates

A wafer-scale electrochemical flow cell specially suited for uniform thin-film electrodeposition is presented. The cell consists of a porous disk injector set parallel and coaxial to a working disk electrode with a narrow separation gap between them. The porous injector was designed to supply a uniform axial flow of electrolyte onto the surface of the working disk electrode. The mass transfer characteristics of the cell and the current distribution on the working disk electrode were studied for various operating conditions, geometric parameters and bath chemistries. The experimental results confirmed the simple scaling properties that were theoretically predicted. It has also been shown that this cell can provide nearly uniform current distribution on the working electrode under conditions of both migration and convective-diffusive mass transfer control. The results indicate that this cell is suitable for uniform thin-film electrodeposition onto large circular wafer substrates.     

Application of anodized titanium for enhanced recruitment of endothelial progenitor cells

Objectives

To study the efficacy of an effective anodized titanium surface with enhanced attachment of endothelial progenitor cell (EPC).

Background

In-stent restenosis is a major obstacle for vascular patency after catheter-based intravascular interventions. Recently, stents that capture EPCs have been paid attention in order to make a functional endothelialized layer at the site of stent-induced endothelial denudation. Anodized titanium has been shown to enhance stem cell attachment. Anodization is a quick and inexpensive method, which can provide suitable stent surface.

Methods

Surface topography was examined by high-resolution scanning electron microscopy (SEM). Substrates were co-cultured with EPCs at second passage in 24-well culture plates. Evaluation of cell growth, proliferation, viability, surface cytotoxicity and cell adhesion was performed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test and 4,6-diamidino-2-phenylindole dihydrochloride staining. For platelet attachment, platelets added to substrates were evaluated under SEM.

Results

The average MTT values for tissue culture polystyrene plate, unanodized and anodized titanium with nanostructure were equal to 0.49, 0.16 and 0.72, respectively (P < 0.05). The surface had no cytotoxic effects on cells. The average cell attachment results showed that 9,955 ± 461.18, 3,300 ± 197.98 and 11,359 ± 458.10 EPCs were attached per well of tissue culture polystyrene plate, unanodized and anodized titanium surfaces, respectively (P < 0.05).

Conclusions

Anodized titanium surfaces can be potentially applied for devices that need enhanced recruitment of EPCs. This unique property makes these anodized surfaces good and cheap candidates for designing cardiovascular medical devices as endovascular stents.     

MG63 osteoblast cell response on Zn doped hydroxyapatite (HAp) with various surface features

The clinical success of implant is governed by implant-surface and bone cell interaction that promote osseointegration and long term stability. Calcium hydroxyapatite (HAp) is a widely used bioceramic material for orthopedic and dental applications, which promotes bone tissue generation. Doped hydroxyapatite using various metallic ions is often reported to enhance this osteoconductive property. The objective of this study was to synthesize zinc doped HAp, to investigate the osteoblast cell response on this doped HAp and find out separately the effect of doping and different surface parameters on cell response. Slip casting technique was used to prepare pure and doped HAp specimens which were sintered at 1100 °C and 1250 °C. Different porosities, pore sizes were generated along with different surface roughness so as to understand the effect of these extrinsic parameters on cell culture. MG63 osteoblast cells were used for a maximum period of two weeks. Metabolic activity, adhesion and proliferation rate study of osteoblast cells on doped HAp showed significantly better response than pure HAp. Effect of doping was found to be more prominent than the effect of surface roughness.     

染料敏化太阳能电池Pt/NiP/ITO对电极的制备和性能

在ITO导电玻璃表面化学镀NiP合金薄膜,然后电化学沉积Pt纳米粒子,形成染料敏化太阳能电池Pt/NiP/ITO对电极。优化了化学镀NiP合金的工艺条件;研究了NiP的结构和铂载量对Pt/NiP/ITO电极形貌和催化活性的影响。采用原子力显微镜分析Pt/NiP/ITO电极的表面形貌;采用循环伏安法、电化学交流阻抗法表征其电化学性能;采用单体DSSC的光电流–电压曲线表征其光伏性能。测试结果表明,在ITO基体上化学镀NiP合金,提高了电极的导电性和光反射能力,改善了电极表面Pt粒子的分布,使电池的短路电流密度和光电转化效率分别提高了4%和11%。