聚四氟乙烯表面改性的研究进展

综述了国内外聚四氟乙烯(PTFE)表面改性的研究进展,主要介绍了改性技术(如钠-萘络合物化学改性、高温熔融改性、高能辐射接枝改性、准分子激光处理、离子束注入改性和低温等离子体改性等)在PTFE表面改性方面的应用情况,简要叙述了各种改性方法的优势与不足,并由此提出了PTFE表面改性的发展趋势。     

聚四氟乙烯膜亲水改性及在工业污水处理中的应用进展

聚四氟乙烯(PTFE)膜因化学性能稳定、耐高温、耐酸碱等特点被广泛应用在化工、纺织、环境、食品等领域。然而,由于PTFE材料的强疏水性和极低表面能,使得PTFE膜润湿性差,难以处理水性溶液,限制了其应用。对近年来常用的钠-萘溶液处理、等离子体接枝、多巴胺改性、表面活性剂改性等PTFE膜亲水改性方法进行了综述。相关研究表明,亲水改性后的PTFE膜可以用于污水处理、膜蒸馏、膜生物反应器等领域。最后对PTFE膜亲水改性的发展趋势进行了展望。     

聚四氟乙烯的表面处理

分析了聚四氟乙烯（PTFE）难与其他物质粘结的原因,综述了PTFE表面处理方法及应用,并对PTFE的表面改性机理进行了初步探讨.     

聚四氟乙烯表面化学改性研究进展

针对聚四氟乙烯(PTFE)表面的难粘接性,与其它材料的不相容性,综述了PTFE表面化学改性的几种常用方法(分别为等离子体处理法、辐射处理法、化学溶液处理法和核壳结构材料改性法)及其改性工艺,简要叙述了各种改性方法的优势与不足,最后介绍了各种表面化学改性方法的使用范围与应用前景。     

聚四氟乙烯表面改性技术研究进展

综述了国内外聚四氟乙烯(PTFE)表面改性技术的研究进展,主要介绍了准分子激光改性、高能辐射改性、化学改性、高温熔融改性、等离子体改性及离子束注入改性等在PTFE表面改性方面的应用情况,简要叙述了各种改性方法的优势与不足,并对PTFE表面改性的发展趋势进行了展望。     

聚四氟乙烯微粉的表面改性及其在橡胶中应用的研究进展

聚四氟乙烯(PTFE)微粉具有良好的综合性能,经常用作材料的改性添加剂。本文首先介绍了PTFE微粉表面改性所采用的辐照处理法、等离子体处理法、化学溶液处理法、高温熔融法和种子乳液聚合法的特点,表面改性可改善PTFE微粉与其他材料共混时分散不均匀、相容性差的缺点,然后阐述了PTFE微粉在氟橡胶、丁腈橡胶、丁苯橡胶、乙丙橡胶、硅橡胶、丁基橡胶和天然橡胶中的应用研究进展。     

Ar等离子体改性PTFE膜接枝丙烯酸的研究

本研究利用Ar等离子体为引发手段对PTFE膜进行表面处理,最终实现在PTFF膜表面接枝丙烯酸。通过XPS和ATR-FTIR对改性膜的表面进行表征,表明在PTFE膜的表面形成一层聚丙烯酸（PAAc）薄膜。PTFE—g—PAAc膜的表面亲水性及其表面稳定性比等离子改性PTFE膜具有较大的改善,克服了等离子体改性效果不稳定的缺点。本研究拓展了PTFE膜材料在其他各相关领域的应用,对其他高分子材料也有一定的借鉴意义。     

Ar等离子体改性PTFE膜接枝丙烯酸研究

研究利用Ar等离子体为引发手段对聚四氟乙烯(PTFE)膜进行表面处理,最终实现在PTFE膜表面接枝丙烯酸.通过XPS和ATR-FTIR对改性膜的表面进行表征,表明在PTFE膜的表面形成一层聚丙烯酸(pAAc)薄膜.PTFE-g-pAAc膜的表面亲水性及其表面稳定性比等离子改性PTFE膜(PTFE modified by plasma)具有较大的改善,克服了等离子体改性效果不稳定的缺点.本研究拓展了PTFE膜材料在其他各相关领域的应用,对其他高分子材料也有一定的借鉴意义.     

聚四氟乙烯对工程塑料的共混改性研究进展

讨论了聚四氟乙烯（PTFE）对聚甲醛、聚醚醚酮、聚间苯二甲酰间苯二胺、聚苯硫醚、聚酰胺、聚酰亚胺及线型低密度聚乙烯等工程塑料的共混改性问题,通过对PTFE进行适当的表面处理或在改性过程中添加适当的特定成份可以增加PTFE和其它高聚物之间的相容性,表面改性后的PTFE与其它工程塑料共混可显著降低摩擦系数,提高耐磨性能。     

氩等离子体处理聚四氟乙烯粘接性能研究

利用氩等离子体表面处理后再经丙烯酸化学接枝处理方法对聚四氟乙烯(PTFE)薄片表面进行改性,发现PTFE对水的润湿性明显改善,然后用环氧胶进行粘接,其粘接强度有较大提高。     

纳米粒子填充PTFE摩擦副材料的研究进展

综述国内外纳米粒子填充聚四氟乙烯(PTFE)摩擦副材料的研究进展,对纳米粒子填充后的减摩抗磨机理进行探讨,提出“滚珠轴承”、膜润滑和界面束缚作用三个观点,分析该项研究在纳米粒子分散技术和纳米粒子与PTFE基体界面处理上存在的不足,并结合复合材料界面处理机理、PTFE表面粘结机理和纳米粒子分散机理,提出一些新的纳米粒子填充PTFE复合材料界面改性和分散技术的方法。     

无卤膨胀型阻燃剂的研究进展

综述了近年来膨胀型阻燃剂的研究现状,包括混合型膨胀型阻燃剂和单组分膨胀型阻燃剂。简要概述了膨胀型阻燃剂的阻燃机理,分析了其存在的不足,指出了其发展趋势。     

不同方法处理碳纤维增强PTFE复合材料性能的研究

采用两种不同的方法对碳纤维(CF)表面进行处理,一种是先以热空气对CF进行氧化处理,然后用偶联剂进行表面处理;另一种是先用聚四氟乙烯(PTFE)乳液对CF进行浸渍,后用等离子体进行表面处理。研究了不同方法、不同表面处理条件对PTFE/CF复合材料拉伸性能的影响,并应用扫描电镜对拉伸断口形貌进行了分析。结果表明,两种方法都能有效地提高CF与PTFE之间的界面结合力及PTFE/CF复合材料的拉伸性能。     

Surface grafting polymerization and modification on poly(tetrafluoroethylene) films by means of ozone treatment

Surface modification on polytetrafluoroethylene (PTFE) films was performed with sequential hydrogen plasma/ozone treatments and surface-initiated polymerization. C-H groups were introduced to the surface of PTFE films through defluorination and hydrogenation reactions under hydrogen plasma treatment. The C-H groups then served as ozone accessible sites to form peroxide groups under ozone treatment. Grafting polymerization initiating from the peroxide groups was performed on the PTFE film surface with using acrylamide, acrylic acid, glycidyl methacrylate and 2-(2-bromoisobutyryloxy)ethyl acrylate (BIEA) as monomers. With utilizing the isobutylbromide groups on the surface of PTFE-g-PBIEA film as initiators, sodium 4-styrenesulfonate (NaSS) was polymerized onto the PTFE film surface via atom transfer radical polymerization, to bring arborescent macromolecular structure to PTFE film surface. The chemical structures of the macromolecules on PTFE film surfaces were characterized with FTIR-ATR, SEM-EDX and XPS. The surface hydrophilicities of modified PTFE films were significantly enhanced with the modification.     

聚四氟乙烯表面改性研究进展

介绍了钠-萘溶液、等离子体、高能辐射接枝、激光辐射、离子注入等几种不同的聚四氟乙烯表面改性方法及其研究进展。     

Effects of surface modification by remote hydrogen plasma on adhesion in poly(tetrafluoroethylene)/copper composites

Poly(tetrafluoroethylene) (PTFE) sheet was modified with the remote hydrogen plasma, and the effect of the modification on adhesion between the PTFE sheet and copper metal was investigated. The remote hydrogen plasma was able to make PTFE surfaces hydrophilic without etching. In the modification process, defluorination and oxidation occurred on the PTFE surface. Reactivity of defluorination was 25% (estimated from the concentration of CF₂ component) −39% (estimated from the F/C atom ratio). Surface modification of PTFE surface by remote hydrogen plasma contributed to the adhesion between PTFE and copper metal. Peel strength was improved from 7.5 to 92 mN/5 mm by surface modification by a factor of 12. Failure of the PTFE/copper adhesive joint occurred at the interface between the PTFE and copper metal layers, rather than in the inner layer of the PTFE polymer or copper metal layers. Remote hydrogen plasma treatment is a preferable pretreatment of PTFE surface for the fabrication of PTFE and copper metal composites. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 2191–2200, 1999     

聚酰亚胺型黏合剂对PTFE微孔薄膜的黏合性能

研究了具有优异耐热性的聚酰亚胺胶黏剂对聚四氟乙烯微孔薄膜的粘接性能.结果表明,聚酰亚胺胶黏剂对未经表面改性的聚四氟乙烯微孔薄膜没有粘接能力.采用钠萘溶液、N2和O2等离子体处理后,聚四氟乙烯微孔薄膜亲水性增强,聚酰亚胺胶黏剂都可以获得不同程度的粘接能力.但不同的处理方法,同等的亲水性条件下,粘接能力有一定的差异.钠萘溶液改性处理时,只有在接触角小于90°的情况下才可以明显改善薄膜的粘接性能.在亲水性90°～120°范围内,等离子处理的粘接效果要好于钠萘处理的情况.     

Surface modification of polytetrafluoroethylene films by plasma pretreatment and graft copolymerization to improve their adhesion to bismaleimide

BACKGROUND: Polytetrafluoroethylene (PTFE) is utilized in many engineering applications, but its poor wettability and adhesion properties with other materials have limited its use. The study reported was aimed at achieving surface modification of PTFE films by radiofrequency NH₃ and N₂ plasma treatment, followed by graft copolymerization, in order to improve the interfacial adhesion of PTFE and bismaleimide. RESULTS: X‐ray photoelectron spectroscopy results showed that a short‐time plasma treatment had a distinct defluorination effect and led to nitrogen functional group formation. The nitrogen chemical bonding form was different for NH₃ and N₂ plasma treatments. Under the same experimental conditions, the NH₃ plasma exhibited a better etching effect than did the N₂ plasma. Contact angle measurement showed an improvement in both surface energy and wettabliity by short‐time plasma treatment. The concentration of the surface‐grafted bismaleimide on PTFE increased after the plasma pretreatment. The lap shear strength between PTFE and bismaleimide increased significantly after surface modification. CONCLUSION: This study found that plasma treatment caused changes in surface chemistry, thus leading to an increase of the wettability of PTFE surfaces. Hence, the adhesion properties of PTFE with bismaleimide were significantly improved. Copyright © 2008 Society of Chemical Industry