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Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
The volume of a particular material or compound is affected by ambient moisture and may be considered its coefficient of hygroscopic expansion (CHE) (also referred to as CME, or coefficient of moisture expansion) or the coefficient of hygroscopic contraction (CHC)—the difference between the two terms being a difference in sign convention.
Polymer degradation is the reduction in the physical properties of a polymer, such as strength, caused by changes in its chemical composition.Polymers and particularly plastics are subject to degradation at all stages of their product life cycle, including during their initial processing, use, disposal into the environment and recycling. [1]
A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .
This causes the silvery pattern, or streaks, to appear on the surface of the plastic. Splay can be avoided by keeping moisture out of plastics and injection molding machines. Non-hygroscopic plastics that do not absorb moisture are less likely to suffer from splay. Mold leaks, improper drying of materials, incorrect material throughput, and non ...
Plastic pudding cups came along as a smarter, safer alternative to the metal cans that once held Hunt's Snack Pack Pudding — because nothing makes a snack more exciting than the possibility of ...
The chemical bond in a polymer backbone may be broken with the generation of free radicles by heat, ionizing irradiation, mechanical stress and chemical reactions. These scissions multiply in number and cause a fracture tip initialization to occur followed by its growth. [3]
Human brains today contain 50% more plastic than in 2016, a new study found. Brain of people diagnosed with dementia had the most. Human brain samples contain an entire spoon’s worth of ...