Parts of the Small Intestine. The small intestine has three parts: the duodenum, the jejunum and the ileum. The duodenum is the first portion of the small intestine, and it receives the contents of the stomach.unction of the Small Intestine. The small intestine is responsible for absorbing most of the nutrients found within your food. By the time ingested food reaches the small intestine, it has been mechanically broken down into a liquid.
Polyester is a category of polymers that contain the ester functional group in their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in the cutin of plant cuticles, as well as synthetics through step-growth polymerization such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. This material is used very widely in clothing.
POLYESTER FIBERS. Polyester fiber is a  manufactured fiber in which the fiber forming substance is any long chain synthetic polymer composed at least 85% by weight of an ester of a dihydric alcohol (HOROH) and terephthalic acid (p-HOOC-C6H4COOH) [3].dditional current U.S. Polyester Fiber Producers are: Acordis Industrial Fibers, Inc.; AlliedSignal Inc; Cookson Fibers, Inc.; KoSa; Intercontinental Polymers, Inc., Martin Color-Fi. Nan Ya Plastics Corp., Wellman, Inc. [24] Dramatic growth in PET fiber production is foreseen in Asia in the near future [22].