By Ralf H. Dahm, Derek M. Brewis
Fluorinated polymers have a few very helpful houses equivalent to first-class chemical resistance. even if, they're often tough to bond and not using a pretreatment. There are exceptions and untreated poly(vinylidene fluoride), for instance, will be effectively bonded with an amine-cured epoxide. the best the way to pretreat absolutely fluorinated polymers have been constructed within the Nineteen Fifties. a lot paintings, specifically on electrochemical and plasma remedies, has because been performed yet up to now those haven't proved as potent because the early tools. in part fluorinated polymers might be handled like polyolefins, for instance, flame, and plasma remedies are very potent. Aqueous and alcoholic ideas of crew I hydroxides also are very powerful. Fluoropolymers offers a mix of houses together with extreme temperature resistance, first-class resistance to many chemical substances and ultraviolet (UV) radiation, hearth resistance and coffee friction. Fluoropolymers are fairly dear and they're in general 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 services. There are greater than twenty assorted fluoropolymers which are commercially to be had. strong 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 akin to PTFE and FEP are notoriously tricky to stick to, whereas in part fluorinated polymers reminiscent of PVDF and PVF can cause difficulties counting on the situations. to accomplish a passable point of adhesion, it is usually essential to perform a pretreatment with either totally and partly fluorinated polymers. during this evaluation 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 stable adhesion is completed and not using a pretreatment are tested in part four. even though, as pretreatments tend to be had to get the mandatory point of adhesion, this evaluate is especially excited by the big variety of equipment to be had to pretreat fluoropolymers (Section 5). A basic dialogue and conclusions stick to. This Rapra evaluate record includes a concise, professional evaluation, supported by way of an in depth bibliography compiled from the Polymer Library concerning adhesion to fluoropolymers. This bibliography presents more information in this topical box. This assessment might be of curiosity either to those that already use fluoropolymers and people who are contemplating utilizing them.
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All the polymer coatings obtained left the labile pentafluorophenyl group on the surface, enabling a rapid reaction with an amino-terminated biotin ligand and allowing layer-by-layer assembly of biotin-streptavidin. In addition, the deposited polymer layers showed an extremely flat morphology with a nanoscale average roughness. This approach provided an easy method of obtaining functionalised surfaces that could enhance and control the biocompatibility of bulk materials. It was demonstrated that by combining the versatility of plasma polymerisation processes, via simple monomers and reaction conditions, with biological platforms that enabled targeting of cell adhesion, the ultimate goal of controlling cell function through structured surfaces for their application in tissue engineering was brought closer.
31 refs. 934394 Item 7 Patent Number: US 6838520 B2 20050104 ADHESIVES FOR FLUOROPOLYMER FILMS AND STRUCTURES CONTAINING SAME Etherton B P Equistar Chemicals LP The adhesives are a blend of linear low density polyethylene, ethylene polymer plastomer, polyolefin elastomer and a modified polyolefin having acid or acid derivative functionality. Composite fluoropolymer/adhesive structures are also provided. 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.
11). The pretreatment of most other polymers involves the generally irreversible introduction of various functionalities into the outermost surface layers of the polymer. In general the carbonaceous film appears to adhere strongly to the polymer and the locus of failure is frequently within the untreated polymer particularly for the electrochemical treatment. The reduction of fully halogenated polymers produces in most cases an electronically conducting product so that the mechanism of many ‘chemical’ reduction processes are essentially electrochemical in nature.
Adhesion to Fluoropolymers by Ralf H. Dahm, Derek M. Brewis