By Ralf H. Dahm, Derek M. Brewis
Fluorinated polymers have a couple of very invaluable houses comparable to very good chemical resistance. besides 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 the right way to pretreat absolutely fluorinated polymers have been constructed within the Nineteen Fifties. a lot paintings, specially on electrochemical and plasma remedies, has considering the fact that been performed yet thus far those haven't proved as potent because the early equipment. in part fluorinated polymers can be taken care of like polyolefins, for instance, flame, and plasma remedies are very potent. Aqueous and alcoholic recommendations of crew I hydroxides also are very powerful. Fluoropolymers provides a mix of houses together with extreme temperature resistance, very good resistance to many chemical substances and ultraviolet (UV) radiation, fireplace resistance and coffee friction. Fluoropolymers are fairly pricey and they're often utilized in specialized purposes similar to linings for chemical plant, spacecraft coatings which are immune to atomic oxygen, fire-resistant coatings for cables, and naturally, non-stick capabilities. There are greater than twenty varied fluoropolymers which are commercially on hand. stable adhesion is needed in a few applied sciences regarding fluoropolymers together with adhesive bonding, portray, printing, metallisation (via vacuum or answer) and composite creation. even if, totally fluorinated polymers equivalent to PTFE and FEP are notoriously tricky to stick to, whereas in part fluorinated polymers resembling PVDF and PVF could 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 partly fluorinated polymers. during this evaluate the foundations of adhesion are thought of first (Section 2). concepts that experience significantly elevated our knowing of adhesion to fluoropolymers are defined in part three. circumstances the place stable adhesion is accomplished and not using a pretreatment are tested in part four. although, as pretreatments tend to be had to get the necessary point of adhesion, this evaluate is especially keen on the wide range of tools on hand to pretreat fluoropolymers (Section 5). A basic dialogue and conclusions keep on with. This Rapra evaluation record contains a concise, professional evaluation, supported by means of an in depth bibliography compiled from the Polymer Library regarding adhesion to fluoropolymers. This bibliography presents more information in this topical box. This assessment could be of curiosity either to people who already use fluoropolymers and people who are contemplating utilizing them.
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This was possibly due to partial melting. 30 refs. ; IBM PTFE film surfaces were exposed to vacuum UV radiation from plasma that rotated inside a graphite tube by the application of an auxiliary magnetic field. Films were covered with optical filters having different cutoff wavelengths to vary the vacuum UV radiation that modified the fluoropolymer surface. Photo-etching was detected as well as surface modification. 68 refs. 515-9 INVESTIGATION OF A NEW REACTANT FOR FLUORINATED POLYMER SURFACE TREATMENTS WITH ATMOSPHERIC PRESSURE GLOW PLASMA TO IMPROVE THE ADHESIVE STRENGTH 34 Tanaka K; Kogoma M Sophia,University Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers and PTFE films were treated by three kinds of atmospheric pressure glow plasmas.
A plasma treatment followed by the grafting on of a photoinitiator which results in a stable but light sensitive surface. The surface is then coated with a UV hardenable formulation such as an acrylate lacquer and exposed through a mask, if desired, to UV light. Unexposed lacquer is removed with ethanol after which other coatings or adhesives may be applied to the hardened lacquer which is covalently bonded to the initiator which is in turn covalently bonded to the plasma treated surface. The authors claim ‘astonishingly’ good results for the coating of PTFE using this so called ‘Smart Priming Process’.
This effect was partially reversed over a period of three weeks. The authors attributed this to a partial reorientation of chain segments such that oxygen-containing functional groups moved towards the bulk of the polymer. From the decreased F:C ratio, the authors concluded that some crosslinking had occurred and that this might account for the incomplete recovery in contact angles. 5 In contrast to the contact angle data, Griesser and coworkers found that the oxygen content within the XPS sampling depth increased on storage over a few weeks and suggested that a possible mechanism could involve the relatively slow breakdown of peroxy radicals.