Blockage of the bile duct by a cancer, gallstones, or scarring from injury prevents the bile from being transported to the intestine and the active ingredient in the bile (bilirubin) instead accumulates in the blood.
Over 60 million tonnes of poly(ethene), often known as polyethylene and polythene, is manufactured each year making it the world's most important plastic. Its uses include film, packaging and containers, from bottles to buckets.ses of poly(ethene) (polyethylene). -3) and linear low density (LLDPE) (ca 0.915-0.940 g cm -3) and high density (HDPE) (ca 0.940-0.965 g cm -3). The LDPE or LLDPE form is preferred for film packaging and for electrical insulation.
Uses of poly(chloroethene) (polyvinyl chloride). Poly(chloroethene) is used in building and construction, for example in making window and door profiles and in making pipes (from guttering to sewers, and ducting for cables). Figure 1 Uses of poly(chloroethene).hloroethene (vinyl chloride) is also used to produce co-polymers, for example with ethenyl ethanoate (vinyl acetate). The co-polymer can be processed at much lower temperatures than poly(chloroethene) homopolymers of the same relative molecular mass.