聚四氟乙烯表面处理与粘接

分析聚四氟乙烯（PTFE）难粘接的原因，介绍化学处理法、高温熔融法、辐射接枝法、低温等离子体处理法等PTFE常用的表面处理方法，以及PTFE常用的表面改性剂和粘接性能优良的新型PTFE粘接剂。     

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.     

聚四氟乙烯的表面活化与粘接

叙述了钠－萘溶液活化聚四氟乙烯表面的方法和粘接工艺，并测试了粘接件的主要性能。     

一种适于提高氟塑料粘接性能的表面改性剂

本研究以一种新的表面改性剂对聚四氟乙烯（ＰＴＦＥ）的表面进行改性用于改善粘接性能,并与其它几种表面改性的改性效果进行了比较。     

聚四氟乙烯粘接技术

PTFE 的各种粘接技术、直接粘接的粘合剂、热熔焊接、多种多样的表面处理方法、PTFE膜基胶粘带的品种、性能及应用,各种粘接技术的评价。     

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。     

聚四氟乙烯表面处理

本文介绍了各种聚四氟乙烯ＰＴＥＥ膜的处理方法,以及国外近几年来采用的新方法。     

聚四氟乙烯表面冷等离子体改性对粘接的影响

PTFE是一种难粘的聚合物,为了提高其表面粘接性,必须对其表面进行改性。本工作是采用低温等离子体方法来改性PTFE表面,即在固定频率、功率、气流量等条件下,改变等离子体种类及处理时间,然后观察其对接触角、表面能、表面化学组成以及对粘接性能的影响,并对其结果进行讨论。     

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.     

Thermal annealing as a new simple method for PTFE texturing

The present work demonstrates how polytetrafluoroethylene can be textured at both nanometric and microscopic scales by simply controlling the duration and temperature of the polymer annealing. Two main phenomena responsible for the PTFE surface texturing are identified which are the crystallite growth and the stress relaxation. The patterned surfaces were analysed by scanning electron microscopy, differential scanning calorimetry and contact angles measurements. As expected, an enhancement of the hydrophobic and oleophobic properties due to the texturation of the treated PTFE is observed.     

一种粘接性能优异的含氟聚合物粘合剂

研究以一种含氟聚合物为主体材料制备用于聚四氯乙烯粘接的粘合剂,探讨了固化剂和金属氧化物对该粘合剂粘接性能的影响,分析了表面改性剂的改性作用,并考察了用于不锈钢粘接的情况。     

The properties of poly(tetrafluoroethylene) (PTFE) in tension

Samples of DuPont 7A and 7C Teflon (PTFE, poly(tetrafluoroethylene)) were tested in tension at strain-rates between 2×10⁻⁴ and 0.1 s⁻¹ and temperatures between −50 and 150 °C. Additionally, using a Hopkinson bar, a temperature series was undertaken in tension between −50 and 23 °C at a strain rate of 800 s⁻¹. To investigate the small-strain response, strain gauges were used to measure axial and transverse strain allowing the Poisson ratio to be calculated. The effect of crystallinity was investigated using 7C material thermally processed to produce more amorphous material. As expected, the tensile mechanical properties of PTFE are significantly affected by strain-rate and temperature, but only to a limited extent by crystallinity. The Poisson ratio at small strains was found to differ in tension (≈0.36) and compression (≈0.46). Failure behavior and microstructure were correlated to temperature induced phase transitions.     

聚四氟乙烯生产现状与改性进展

叙述国内PTFE树脂的改性技术研究与应用,介绍了三种改性技术方法及特点。     

聚四氟乙烯在表面处理中的研究现状与发展

叙述了聚四氟乙烯在表面处理中的研究状况与新进展,主要介绍了聚四氟乙烯的各种表面处理方法:钠 萘溶液处理法、等离子体处理法、电解还原法、高温熔融处理法、辐射接枝处理法等等,然后对它们各自的优缺点进行了讨论,并且提出了今后在对聚四氟乙烯表面处理这一方面的发展方向。     

聚四氟乙烯改性研究进展

从聚四氟乙烯的组成、结构、物理化学特性以及成型加工等方面说明对聚四氟乙烯进行改性的必要性;并对其表面改性、填充改性、共混改性等方法进行了详细的介绍,最后指出了聚四氟乙烯改性的新方向。     

^60Co辐照对PTFE表面结构和表面能的影响

为了改善氟聚合物加工性和二次加工性,研究了PTFE聚合物的加工技术。以不同剂量辐照PTFE,PTFE粉末辐照后表面晶相没有发生变化。模压辐照的PTFE,其密实性较好,表面光滑。同时,辐照PTFE后表面有大量的极性亲水基团出现,使表面极性分量增加;而色散分量变化较小。辐照产生的表面极性基团减小了由于不同模压产生的表面所引起的接触角变化。