Dry skin, usually the culprit behind cracked heels, commonly appears on such areas of the feet as the soles and heels. Shop Now. Causes: The best way to treat and also prevent dry, cracked skin on your feet is to use good therapeutic ointments and creams.Avoid using lotions, as these often contain alcohol, which actually dries the skin out more. Dry skin can result from a variety of reasons: 1  Age.2  Improperly fitting shoes. 3  Athlete's foot.4  Psoriasis.he best way to treat and also prevent dry, cracked skin on your feet is to use good therapeutic ointments and creams. Avoid using lotions, as these often contain alcohol, which actually dries the skin out more. Dry skin can result from a variety of reasons: 1  Age. 2  Improperly fitting shoes.
Addition Polymers. Addition polymers such as polyethylene, polypropylene, poly(vinyl chloride), and polystyrene are linear or branched polymers with little or no cross-linking.As a result, they are thermoplastic materials, which flow easily when heated and can be molded into a variety of shapes.olyethylene has no taste or odor and is lightweight, nontoxic, and relatively inexpensive. It is used as a film for packaging food, clothing, and hardware. Most commercial trash bags, sandwich bags, and plastic wrapping are made from polyethylene films.
] at room temperature. Poly(ethylene terephthalate) (PET), with an oxygen permeability of, is not considered a barrier polymer by the old definition; however, it is an adequate barrier polymer for holding carbon dioxide in a 2-L bottle for carbonated soft drinks.