Download Metallized and magnetic polymers : chemistry and by Johannes Karl Fink PDF

By Johannes Karl Fink

This e-book specializes in the chemistry of metallized and magnetic polymers, in addition to the precise functions of those fabrics. After an introductory part at the common facets of the sphere, the categories and makes use of of those polymers are distinctive, by means of an summary of the trying out methods.

The ebook is split both into elements – metallized polymers and magnetic polymers – and either components stick with a similar structure:

  • All equipment of fabrication
  • Properties and techniques of dimension together with regular try equipment and interface properties
  • Fields of applications
  • Environmental concerns together with recycling and biodegradable polymers

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Extra info for Metallized and magnetic polymers : chemistry and applications

Sample text

The result is that, again, the physical properties, such as tensile strength, abrasion and tear resistance, the elastic modulus and extensibility, are reduced. It is also unfavorable that the distribution of metal obtained in the shaped polymer article is not homogeneous. All these disadvantages can be overcome by providing synthetic or natural polymer granules with a metal layer using currentless chemical metallization or combined currentless chemical and galvanic metallization, and then processing the granules thus treated by methods customary in the plastics industry.

However, electroless plating is one feasible method for the plating of polymeric materials. The development of chemical etchants resulted in a controlled microporous surface of the polymeric material and greatly improved electroless plating baths, leading to metal depositions which adhere well to the polymeric surface and which may serve as a conductive preplating for subsequent electroplating. Electroless plating processes are labor intensive, complicated and hence expensive. For example, a typical electroless plating procedure involves the steps of etching the polymeric material with strongly oxidizing solutions of chromic acid in order to physically roughen the polymeric surface and chemically modifying it to give it a hydrophilic nature; neutralizing it with a mildly acidic or basic reducing agent for removing the detrimental hexavalent chromium; sensitizing it with stannous chloride and palladium chloride for nucleation of palladium, accelerating it with acidic or basic solutions for removing excess tin and exposing palladium nuclei and electroless depositing metals such as nickel and copper on it from a plating bath (6).

With the development of plastic materials, the capacitor industry started to replace paper with thin polymer films. One very early development in film capacitors was described in 1947 (13). 1. 1 Historic order of plastics as capacitors (14). Polymer Abbreviation Introduced in Poly(styrene) PS 1949 Poly(ester) PET 1951 Cellulose acetate CA 1951 Poly(carbonate) PC 1953 Poly(tetrafluoroethylene) PTFE 1954 Poly(parylene) 1954 Poly(propylene) PP 1954 Poly(ethylene) PE 1958 Poly(phenylene sulfide) PPS 1967 An early special type of plastic film capacitors were made from cellulose acetate films.

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