Adhesion to Fluoropolymers by Ralf H. Dahm, Derek M. Brewis

By Ralf H. Dahm, Derek M. Brewis

Fluorinated polymers have a few very helpful homes similar to first-class chemical resistance. in spite of the fact that, they're often tricky to bond with no pretreatment. There are exceptions and untreated poly(vinylidene fluoride), for instance, will be effectively bonded with an amine-cured epoxide. the simplest easy methods to pretreat absolutely fluorinated polymers have been built within the Fifties. a lot paintings, specifically on electrochemical and plasma remedies, has considering the fact that been conducted yet so far those haven't proved as potent because the early tools. partly fluorinated polymers could be taken care of like polyolefins, for instance, flame, and plasma remedies are very potent. Aqueous and alcoholic ideas of staff I hydroxides also are very potent. Fluoropolymers supplies a mixture of homes together with extreme temperature resistance, very good resistance to many chemical compounds and ultraviolet (UV) radiation, fireplace resistance and occasional friction. Fluoropolymers are particularly dear and they're normally utilized in specialized functions equivalent to linings for chemical plant, spacecraft coatings which are immune to atomic oxygen, fire-resistant coatings for cables, and naturally, non-stick features. There are greater than twenty various fluoropolymers which are commercially on hand. solid adhesion is needed in a couple of applied sciences related to fluoropolymers together with adhesive bonding, portray, printing, metallisation (via vacuum or answer) and composite construction. although, absolutely fluorinated polymers equivalent to PTFE and FEP are notoriously tough to stick to, whereas partly fluorinated polymers akin to PVDF and PVF could cause difficulties counting on the conditions. to accomplish a passable point of adhesion, it's always essential to perform a pretreatment with either totally and in part fluorinated polymers. during this overview the foundations of adhesion are thought of first (Section 2). thoughts that experience vastly elevated our realizing of adhesion to fluoropolymers are defined in part three. instances the place sturdy adhesion is completed with out a pretreatment are tested in part four. in spite of the fact that, as pretreatments tend to be had to get the necessary point of adhesion, this evaluation is especially focused on the wide range of equipment to be had to pretreat fluoropolymers (Section 5). A basic dialogue and conclusions persist with. This Rapra assessment file includes a concise, professional evaluate, supported by way of an intensive bibliography compiled from the Polymer Library concerning adhesion to fluoropolymers. This bibliography presents additional info in this topical box. This assessment can be of curiosity either to those that already use fluoropolymers and those that are contemplating utilizing them.

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Ion etching caused extensive roughening but the resulting surfaces contained high levels of oxygen (Table 16). The GLD treatment removed much of this O-functionality, while retaining much of the topographical change, and hence the hydrophobicity was greater than with ion etching alone. 45 GHz). They found no modification with O2 or O2/N2 mixtures whatever the conditions. However, using NH3, under suitable conditions, major changes were noted using contact angle measurements and XPS, under suitable conditions.

Fluoropolymer coatings are known as highly durable coatings that can maintain their initial performance for a long period. In the 1980s, Asahi Glass developed a copolymer of fluoroethylene and vinyl ether as a solventsoluble fluoropolymer, known as FEVE. FEVE could be used on-site for applications such as heavy-duty architectural and aerospace coatings, as well as for ovenbaked coatings. When these fluoropolymer coatings were applied as protective coatings, they were used as a topcoat and protected under-layer basecoats and substrates from UV attack.

Garbassi, Surface and Interface Analysis, 1990, 16, 412. 16 J. P. Dousek and V. Patzelova, Carbon, 1975, 13, 5, 377. Abbreviations and Acronyms ASTM American Society for Testing Materials AT-FTIR attenuated reflectance - Fourier transform infrared spectroscopy at. 605-11 FABRICATION OF BIOACTIVE SURFACES BY PLASMA POLYMERIZATION TECHNIQUES USING A NOVEL ACRYLATE-DERIVED MONOMER Francesch L; Garreta E; Balcells M; Edelman E R; Borros S Ramon Llull,University; Harvard,University; Massachusetts Institute of Technology; Boston,Brigham & Women’s Hospital; Harvard Medical School A polymer was synthesised from pentafluorophenyl methacrylate (PFM) and was deposited on silicon wafers by plasma-enhanced chemical vapour deposition.

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