Search results
Results From The WOW.Com Content Network
The presence of chloride groups gives the polymer very different properties from the structurally related material polyethylene. [17] At 1.4 g/cm 3 , PVC's density is also higher than structurally related plastics such as polyethylene (0.88–0.96 g/cm 3 ) and polymethylmethacrylate (1.18 g/cm 3 ).
Vinyl chloride is an organochloride with the formula H 2 C=CHCl. It is also called vinyl chloride monomer (VCM) or chloroethene. It is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC). Vinyl chloride is a colourless flammable gas that has a sweet odor and is carcinogenic.
Vinyl polymers are subject of several structural variations, which greatly expands the range of polymers and their applications. With the exception of polyethylene, vinyl polymers can arise from head-to-tail linking of monomers, head-to-head combined with tail-to-tail, or a mixture of those two patterns. Additionally the substituted carbon center in such polymers is stereogenic (a "chiral center")
Very low coefficient of friction, excellent dielectric properties, chemically inert: Low friction bearings, non-stick pans, inner insulation (dielectric) of coax cable (see also HDPE), coating against chemical attack etc. Polyvinyl chloride: PVC: Insulator, flame retardant, chemically inert
Depending on the method, a varying amount of chlorine is introduced into the polymer allowing for a measured way to fine-tune the final properties. The chlorine content may vary from manufacturer to manufacturer; the base can be as low as PVC 56.7% to as high as 74% by mass, although most commercial resins have chlorine content from 63% to 69%.
It also has thermoplastic properties, and begins to soften at around 65 °C (149 °F). Typically, closed-cell PVC foamboard can be cut as easily as wood , softened and shaped by immersing in boiling water or with a standard heat gun , and painted with standard automobile paints .
It is an acrylic-polyvinyl chloride composite engineered for thermoforming fabrication, and combines properties of both the acrylic and the polyvinyl chloride components. From acrylic, it obtains rigidity and formability; from PVC, toughness, chemical resistance and good interior finish ratings.
Vinyon is a synthetic fiber made from polyvinyl chloride. In some countries other than the United States, vinyon fibers are referred to as polyvinyl chloride fibers. It can bind non-woven fibers and fabrics. It was invented in 1939. It has the same health problems associated with chlorinated polymers.