Polyfvinyl chloride , coatings

A plasticizer is a material that enhances the processibiIity or flexibility of the polymer with which it is mixed. The plasticizer may be a liquid or solid or another polymer. For example, rigid polyfvinyl chloride) is a hard solid material used to make credit cards, pipe, house siding, and other articles. Mixing with about 50-100 parts by weight of phthalate ester plasticizers converts the polymer into leathery products useful for the manufacture of upholstery, electrical insulation, and other items. Plasticizers in surface coatings enhance the flow and leveling properties of the material during application and reduce the brittleness of the dried film. 

The shape of the average specimen is such that only rarely can it be directly placed into the diffractometer for analysis, so that special care has to be taken to achieve the random distribution of the crystallites to have meaningful peak intensities. The problems arising in sample preparation are (1) Particle size. The powdered sample must consist of particles smaller than 5 pm. Collection and separation of particles of these dimensions can be effected by sieving, sedimentation, or elutriation. (2) Surface flatness. Special precautions are needed to make the surface smooth and flat, with its plane including the diffractometer axis. If required, common binders, for instance, collodion, paraffin wax, or silicone grease, are applicable. (3) Preferred orientation. When it is necessary to ensure that the particles do not show preferred orientation, mix crushed glass or other amorphous medium with the powder or coat the plane surface of the sample carrier with a film of adhesive that dries at a moderate rate and then dust a layer of powder on the adhesive, polyfvinyl chloride), after it has become tacky. 

Alimohammadi F, Parvinzadeh Gashti M, Shamei A (2013) Functional cellulose fibCTs via polycarboxylic acid/carbon nanotube composite coating. J Coat Technol Res 10(1) 123-132 Aljaafari A, Abu-Abdeen M, Aljaafari M (2012) Mechanical and electrical properties of polyfvinyl chloride) loaded with carbon nanotubes and carbon nanopowder. J Thermoplast Compos Mater... 

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