复合电沉积RE—Ni—W—SiC—PTFE的研究

复合电镀层的耐磨、耐蚀及自润滑性能良好，越来越受到人们的关注。研究了电流密度、温度、ＰＨ值及镀液中ＰＴＦＥ含量对镀层ＰＴＦＥ、ＳｉＣ含量还沉积速度的影响，优选出一种最佳的复合镀工艺参数。     

橡胶密封圈流化模复合电镀Ni—PTFE的研究

优选出一种Ｎｉ－ＰＴＦＥ复合电镀工艺，研究了搅拌及阳离子表面活性剂对镀层ＰＴＦＥ含量的影响。提出了通过接触角的测量以确定镀层中ＰＴＦＥ含量方法，并叙述了复合镀层在橡胶密封圈硫化模上的应用。     

激光在无电解Ni-P/PTFE复合镀中的应用

应用激光分散镀液，获得了良好的镀层；在激光照射下施镀，可使反应在较低温度下进行，镀液寿命延长，复合镀层中ＰＴＦＥ分布更加均匀。     

各种聚四氟乙烯树脂牌号对复合工艺的影响

１概况 聚四氟乙烯塑料（ＰＹＦＥ）由于分子结构紧密、表面非极性和不溶性，以至使用普通的粘结剂难于直接粘合，是一种典型的难粘材料。随着ＰＴＦＥ加工工艺的深入进行及社会需要，为了改变ＰＴＦＥ不粘性，根据它的特性，以提高表面活性为主来解决ＰＴＦＥ的不粘性。ＰＴＦＥ的表面活化是通过强活化性络合物与它反应，使得ＰＴＦＥ表面形成一粗糙的疏松的烃表面层，这样用一般粘结剂就可以使ＰＴＦＥ与钢板粘接及与橡胶复合，这就进一步开拓了ＰＴＦＥ的使用领域。如ＰＴＦＥ与钢板粘接可用于桥梁滑板及管道滑块，ＰＴＦＥ与橡胶复合可…     

PTFE多孔材料及多孔复合材料的制备方法和应用(二)

２多孔ＰＴＦＥ膜、片复合材料的制备、性能和应用 以多孔ＰＴＦＥ膜、片与其它材料复合,可以组成许多不同性能、不同用途的新型复合材料。这里简要介绍单面ＰＴＦＥ多孔复合材料、布基ＰＴＦＥ多孔复合材料、毡基ＰＴＦＥ多孔复合材料以及ＰＴＦＥ多孔材料的表面改性和填充ＰＴＦＥ多孔材料等。这些复合材料的制备方法各异,它们各有特性,为不同应用领域扩大了选择面。２．１单面ＰＴＦＥ多孔复合材料 单面ＰＴＦＥ多孔复合材料是一面为ＰＴＦＥ多孔膜、片,另一面是纯ＰＴＦＥ片（为方便起见用“ＰＦＯ－ＰＦ”表示ＰＴＦＥ多孔面和纯Ｐ…     

化学复合镀(Ni-Cu-P)-PTFE工艺

研究了化学复合镀（Ｎｉ－Ｃｕ－Ｐ）－ＰＴＦＥ复合材料制备工艺,表明,控制温度在７８－８５℃,ＰＴＦＥ的添加量为１５－２０ｇ／Ｌ,Ｎｉ＾２＋／Ｃｕ＾２＋＝５．６－６．９,添加适量表面活性剂,能够镀覆表面良好的复合材料,工艺稳定。     

复合化学镀(Ni-P)-PTFE工艺研究

研究了含双络合剂化学复合镀（Ｎｉ－Ｐ）－ＰＴＦＥ的工艺过程。分析了各成分对镀液沉积速度,稳定性和使用周期的影响,确定了复合镀的最佳配方及管理方法。结果表明,由于选择了合适的络合剂,缓冲剂和稳定剂进行组合使用,该镀液在连续补加条件下可以使用４个周期,沉积速度保持在７￣１４μｍ／ｈ。     

在复合镀层表面上实现滴状冷凝传热的研究

研究了采用Ｎｉ－ＰＴＦＥ复合镀层表面实现水蒸气滴状冷凝的新方法。在对Ｎｉ－ＰＴＦＥ复合电镀工艺研究的基础上，进行了水蒸气在无镀层的黄铜板表面和有复合镀层表面的冷凝传热的对比实验。实验结果表明，在Ｎｉ－ＰＴＦＥ复合镀层表面上可实现水蒸气的滴状冷凝，有着显著的强化冷凝换热效果。     

Ni—P—PTFE复合镀层的摩擦磨损性及脱模性研究

本文研究了加入ＰＴＦＥ的化学镀Ｎｉ－Ｐ复合镀层的硬度、摩擦磨损特性及非粘着性。实验表明，镀层的硬度随微粒含量的增加而下降。镀层中含ＰＴＦＥ粒子较多时，滑动摩擦中表现出低摩擦系数，即使在长时间高滑动速度的条件下，仍然如此。在轻荷范围（０．９８Ｎ）外，荷载与摩擦阻力的关系符合Ａｍｏｎｔｏｎ法则。结果表明，该复合镀层具有优良的自润滑性，耐磨性和脱模性。     

电沉积RE-Ni-W-P-B4C-PTFE

研究了ＲＥ－Ｎｉ－Ｗ－Ｐ－Ｂ４Ｃ－ＰＴＦＥ复合镀层的性能。结果表明：热处理温度对ＲＥ－Ｎｉ－Ｗ－Ｐ－Ｂ４Ｃ－ＰＴＦＥ复合镀层的硬度影响很大,当温度达到４００℃时,复合镀层的硬度达到极大值（１１４５Ｈｖ）;在同一热处理温度下,当保温时间达到３小时,镀层的硬度值最佳。当热处理温度达到３００℃时,ＲＥ－Ｎｉ－Ｗ－Ｐ－Ｂ４Ｃ－ＰＴＦＥ复合镀层的耐磨性最好。高温氧化试验表明：ＲＥ－ＮＩ－Ｗ－Ｐ－Ｂ４Ｃ－ＰＴ     

Photoassisted degradation of CI Reactive Red 195 using an Fe(III)‐grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range

Polytetrafluoroethylene fibre was grafted with acrylic acid to form an effective ligand, which coordinated with Fe(III) ions to prepare an Fe(III)‐grafted polytetrafluoroethylene fibre complex. The photoassisted degradation of a typical azo dye, CI Reactive Red 195, using the Fe(III)‐grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst in a wide pH range of 3–9 was investigated. In order to achieve better degradation in a higher pH range, the effect of Fe content, incorporation of Cu(II) ions and UV light irradiation on dye degradation was also examined. The results indicated that dye degradation was effective in the presence of the Fe(III)‐grafted polytetrafluoroethylene fibre complex. Fast degradation of the dye can take place in an acidic environment. Increasing the Fe content or incorporating Cu(II) ions can significantly accelerate dye degradation, and UV light irradiation is much more effective than visible light irradiation in a higher pH range, especially in the alkaline pH range.     

复合电镀Ni-P-PTFE工艺条件的研究

通过大量试验研究了镀液主要成分及操作条件对复合镀层中磷、聚四氟乙烯含量的影响,优选出一种最佳复合镀工艺,该工艺具有成本低,镀速快及寿命长等优点。     

Method of increasing yield of fluoropolymer powders in thermal destruction of polytetrafluoroethylene waste

A method was proposed that enables the development of an industrial technology for processing polytetrafluoroethylene by distilling it in NH₃-HF medium with a solid-phase product yield of more than 60%. The effect of the amount of ammonium hydrodifluoride introduced on the rate of the thermal destruction of polytetrafluoroethylene and the yield of fluororganic powder was studied.     

氟醚改性聚四氟乙烯的研制及其应用

从聚四氟乙烯的结构和特性出发,对醚改性聚四氟乙烯与普通聚四氟乙烯的性能作了比较,论述了醚改性聚四氟乙烯的制造、检测及其加工应用。     

Electrical and optical properties of polymer‐Au nanocomposite films synthesized by magnetron cosputtering

Polymer‐Au nanocomposite films were prepared by co‐sputtering from two independent magnetron sources. By sputtering from gold and polytetrafluoroethylene (PTFE) magnetrons, we prepared homogenous composite films using a rotatable sample holder. The microstructure of the nanocomposites was studied by transmission electron microscopy (TEM). The resistivity drops from 10⁷ to 10^?3 Ohm cm over a narrow range of metal content. The thin composite films show a strong optical absorption in the visible region due to surface plasmon resonances. The optical absorption has a strong dependence on the metal content, showing a red shift of the absorption peak from 550 nm to more than 700 nm with increasing gold content. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Experimental analysis of platinum utilization in a DMFC cathode

An experimental analysis of platinum utilization in a DMFC cathode is performed. The chief objective of this work is to elucidate the effect of Nafion and polytetrafluoroethylene (PTFE) on platinum utilization values on the cathode. Polarization curves indicate that the performance of a DMFC is sensitive to the Carbon/Nafion (C/N) and Nafion:PTFE (N/P) ratio in the catalyst layer. Our analysis shows that supported Pt/C catalysts have a much higher platinum utilization value than unsupported catalysts. Platinum utilization is a maximum at a C/N ratio of 2.5 and at a N/P ratio of six. Platinum utilization is more sensitive to the Nafion content in the catalyst layer than the Teflon content.     

PTFE／GF透波复合材料成型工艺与性能研究

为制备高性能聚四氟乙烯(PTFE)基透波复合材料,对玻璃布(GF)增强PTFE的成型工艺进行了研究。通过差示扫描量热法确定了PTFE/GF复合材料的烧结温度,考察了烧结时间、冷却速率、压制压力及组分配比等因素对复合材料性能的影响。结果表明,当GF质量含量为40%、压制压力为45MPa时,PTFE/GF复合材料的拉伸强度最大,可达81.2MPa,介电性能也满足透波复合材料的要求。     

Structural changes in fibres and films from polytetrafluoroethylene upon γ-radiation

Conclusions It has been found that -irradiation of fibres and oriented films of polytetrafluoroethylene in air leads to shrinkage of the specimens, which is replaced by an elongation on increase in the absorbed dose.The effect of shrinkage and subsequent elongation depends on the state of the specimens: shrinkage is increased upon increase in the stretch ratio and diminishes as a result of preliminary annealing.The behavior of oriented polytetrafluoroethylene upon irradiation is explained from the position of a change in molecular and supermolecular structure.Translated from Khimicheskie Volokna, No. 2, pp. 45–46, March–April, 1990.     

溶胶-凝胶法制备PTFE/SiO2杂化材料的工艺研究

研究了溶胶-凝胶法制备聚四氟乙烯/二氧化硅(PTFE/SiO2)杂化材料的工艺条件,讨论了乙醇对杂化材料中PTFE与SiO2分散性的影响。按照SiO2在杂化材料粉体中理论含量为50 %的配方来制备PTFE/SiO2杂化材料,分别研究了陈化时间和陈化温度对SiO2实际含量的影响。结果表明,SiO2的含量随陈化时间的延长而增加,在最初的5 h内增长很快,当陈化时间达到48 h后,SiO2含量达到38.9 %。在不同温度下将PTFE/SiO2凝胶陈化1 h,随着陈化温度的升高,SiO2含量出现先增大后减小的趋势,在40 ℃时含量达到最大为19.8 %。     

聚四氟乙烯/玻璃纤维胶带在风电叶片制造过程中的应用分析

研究了聚四氟乙烯/玻璃纤维胶带作为脱模介质对玻璃钢表面的影响以及对风电叶片制造成本的影响。从接触角、拉剪性能和对不同涂层的附着力这三大方面,对比了分别使用聚四氟乙烯/玻璃纤维胶带、尼龙脱模布、光滑和砂纸打磨这四种方式获得的玻璃钢表面性能。研究结果表明:使用聚四氟乙烯/玻璃纤维胶带获得的玻璃钢表面润湿性一般;玻璃钢使用聚四氟乙烯/玻璃纤维胶带脱模可获得与使用脱模布相当的拉剪性能;使用聚四氟乙烯/玻璃纤维胶带获得的玻璃钢表面涂装附着力与其他方式持平。经济性分析表明国产聚四氟乙烯/玻璃纤维胶带在模具上的应用有望降低风电叶片的制造成本。