By Ralf H. Dahm, Derek M. Brewis
Fluorinated polymers have a couple of very invaluable homes comparable to very good chemical resistance. despite the fact that, they're frequently tough to bond with no pretreatment. There are exceptions and untreated poly(vinylidene fluoride), for instance, can be effectively bonded with an amine-cured epoxide. the simplest how you can pretreat totally fluorinated polymers have been constructed within the Nineteen Fifties. a lot paintings, in particular on electrochemical and plasma remedies, has considering that been conducted yet to this point those haven't proved as potent because the early equipment. partly fluorinated polymers can be taken care of like polyolefins, for instance, flame, and plasma remedies are very powerful. Aqueous and alcoholic options of crew I hydroxides also are very potent. Fluoropolymers gives you a mix of homes together with extreme temperature resistance, very good resistance to many chemical compounds and ultraviolet (UV) radiation, hearth resistance and coffee friction. Fluoropolymers are quite pricey and they're quite often utilized in specialized functions resembling linings for chemical plant, spacecraft coatings which are proof against atomic oxygen, fire-resistant coatings for cables, and naturally, non-stick features. There are greater than twenty varied fluoropolymers which are commercially to be had. sturdy adhesion is needed in a couple of applied sciences regarding fluoropolymers together with adhesive bonding, portray, printing, metallisation (via vacuum or answer) and composite creation. despite the fact that, absolutely fluorinated polymers reminiscent of PTFE and FEP are notoriously tricky to stick to, whereas partly fluorinated polymers resembling PVDF and PVF can cause difficulties looking on the conditions. to accomplish a passable point of adhesion, it is usually essential to perform a pretreatment with either absolutely and in part fluorinated polymers. during this evaluate the foundations of adhesion are thought of first (Section 2). innovations that experience tremendously elevated our figuring out of adhesion to fluoropolymers are defined in part three. instances the place strong adhesion is completed with no pretreatment are tested in part four. despite the fact that, as pretreatments tend to be had to get the mandatory point of adhesion, this evaluation is especially excited about the big variety of equipment on hand to pretreat fluoropolymers (Section 5). A basic dialogue and conclusions stick with. This Rapra assessment file includes a concise, professional assessment, supported through an in depth bibliography compiled from the Polymer Library concerning adhesion to fluoropolymers. This bibliography offers additional info in this topical box. This overview should be of curiosity either to people who already use fluoropolymers and those that are contemplating utilizing them.
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Extra info for Adhesion to Fluoropolymers
These products are claimed to offer converters improved oxygen transmission and water vapour transmission at lower coating weights than its competitors. If a primer is needed for better anchorage, the Hydroflex WD-4009 urethane primer is suggested. The products are listed under the headings of high barrier coatings, heat sealable barrier coatings, and barrier laminating adhesives. Brief typical properties and comments are given for each grade, together with their suitability for bonding to board, paper, PP, polyester, nylon PE, and polycarbonate.
Kritel, Journal of Adhesion, 1991, 36, 95. 7 R. S. Badyal, Journal of the Chemical Society, Chemical Communications, 1991, 958. 8 L. Kavan, Chemical Reviews, 1997, 97, 3061. 9 C. Amatore, C. Combellas, F. Kanoufi, C. Sella, A. Thiebault and L. Thonin, Chemistry: A European Journal, 2000, 6, 5, 820. H. J. M. J. W. Allen, Applied Science Publishers, London, UK. 215. Conclusions • Sodium in liquid ammonia and sodium naphthalenide in a suitable solvent are the most effective pretreatments for fully fluorinated polymers.
The effectiveness of the plasma treatments towards metal adhesion as assessed using the scratch test decreased in the order: N2 > O2> (N2 + H2) > (O2 + H2) > H2 No topographical changes were found by SEM after the plasma treatments and the improved adhesion was attributed to cleaning, improved wetting and formation of Cu—O and Cu—N bonds. Some chemical changes caused by the different plasmas under a particular set of conditions are given in Table 11. Kasemura and co-workers (266) used a domestic microwave oven with an output of 560 W at 2450 MHz operating at a pressure of 26 Pa to pretreat PTFE and FEP.