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(The two numbers in each type of nylon represent the number of carbon atoms in the diamine and the dicarboxylic acid, respectively. Researchers are also investigating ways to make plastics more biodegradable from exposure to sunlight. Highly aligned molecules arrange themselves more compactly, resulting in a stronger plastic. For health reasons, recycled plastics are rarely made into food containers.

The following year, american inventor john w. Farbenindustrie filed a patent for polyepoxide (epoxy), which was not sold commercially until a u. Ceiling space there is often a wealth of available space up high. The key difference between these materials and plastics is that plastics consist of long molecules that give plastics many of their unique properties, while glass, metals, and clay consist of short molecules.