By Ralf H. Dahm, Derek M. Brewis
Fluorinated polymers have a few very worthwhile houses corresponding to very good chemical resistance. even though, they're frequently tough to bond with out a pretreatment. There are exceptions and untreated poly(vinylidene fluoride), for instance, might be effectively bonded with an amine-cured epoxide. the best how you can pretreat totally fluorinated polymers have been built within the Nineteen Fifties. a lot paintings, specially on electrochemical and plasma remedies, has given that been conducted yet up to now those haven't proved as powerful because the early equipment. partly fluorinated polymers will be taken care of like polyolefins, for instance, flame, and plasma remedies are very potent. Aqueous and alcoholic recommendations of staff I hydroxides also are very potent. Fluoropolymers supplies a mixture of houses together with hot temperature resistance, first-class resistance to many chemical substances and ultraviolet (UV) radiation, fireplace resistance and occasional friction. Fluoropolymers are really dear and they're more often than not utilized in specialized functions equivalent to linings for chemical plant, spacecraft coatings which are proof against atomic oxygen, fire-resistant coatings for cables, and naturally, non-stick services. There are greater than twenty diverse fluoropolymers which are commercially to be had. strong adhesion is needed in a few applied sciences regarding fluoropolymers together with adhesive bonding, portray, printing, metallisation (via vacuum or resolution) and composite creation. despite the fact that, absolutely fluorinated polymers equivalent to PTFE and FEP are notoriously tough to stick to, whereas partly fluorinated polymers similar to PVDF and PVF can cause difficulties looking on the situations. 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 assessment the rules of adhesion are thought of first (Section 2). thoughts that experience vastly elevated our knowing of adhesion to fluoropolymers are defined in part three. circumstances the place reliable adhesion is accomplished and not using a pretreatment are tested in part four. even though, as pretreatments tend to be had to get the necessary point of adhesion, this assessment is principally inquisitive about the big variety of equipment to be had to pretreat fluoropolymers (Section 5). A basic dialogue and conclusions persist with. This Rapra evaluate document contains a concise, specialist evaluation, supported by means of an in depth bibliography compiled from the Polymer Library with regards to adhesion to fluoropolymers. This bibliography offers more information 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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Additional resources for Adhesion to Fluoropolymers
Adhesion strength towards nylon is said to be 8 times that of conventional fluororesins. The new resin is Neoflon EFEP (ethyleneperfluoro-ethylene-propene) copolymer. The resin’s basic backbone is ETFE and specialty reactive groups were introduced to modify the resin. The resin is highly stable at room temperature, but heating to in excess of 200C increases reactivity. 29 CROSSLINKER HELPS ADHERE WATERBASED COATING TO TPO USA Highlighted in this concise article is a new crosslinking agent for water-based PU, acrylic, fluoropolymer, and other polymer coatings.
493-500 SELECTED EFFECT OF THE IONS AND THE NEUTRALS IN THE PLASMA TREATMENT OF PTFE SURFACES: AN OES-AFM-CONTACT ANGLE AND XPS STUDY Vandencasteele N; Fairbrother H; Reniers F Brussels,Free University; Johns Hopkins University The treatment of poly(tetrafluoroethylene)(PTFE) surfaces by oxygen and nitrogen neutral and ionic species generated either by RF plasma or in an ion gun was investigated using XPS, AFM and water contact angle measurements. The results are discussed in terms of the effects of modification of the PTFE surface by grafting, chemical etching and by sputtering on surface properties.
However, it should be pointed out that even the highest peel strengths obtained (2 kg per 25 mm) are only moderate. 12). 8 MPa for the best plasma treatment. The authors used XPS to study the pretreated surfaces and also the failure surfaces after the adhesive joints had been destroyed. Some of these results are given in Table 12. The bondability of an RF plasma-treated ethylenetetrafluoroethylene (E-TFE) copolymer was investigated by Hansen and co-workers (252). They found that O2 + SF6, O2 and NH3 plasmas increased the strength of double lap joints bonded with various epoxide adhesives by a factor of 20-30; this compared with an 11-fold increase with the commercial etchant, Tetra-Etch.