Polyester is typically produced through a process known as polymerization. For polyethylene terephthalate (PET), the production process involves the chemical reaction between two primary raw materials: purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and monoethylene glycol (MEG). The production process includes the following steps:

2023年1月23日 · A polyester is made by a reaction involving an acid with two -COOH groups, and an alcohol with two -OH groups. In the common polyester drawn below. Figure: The acid is benzene-1,4-dicarboxylic acid (old name: terephthalic acid) and the alcohol is ethane-1,2-diol (old name: ethylene glycol).

The different uses of polyesters depend on their structure. The benzene rings in the molecular chain give them a rigid structure, leading to high melting points (over 500 K) and great strength. They do not discolour in light.

Polyesters most commonly are prepared from a condensation reaction between an organic alcohol (containing hydroxyl [OH] groups) and a carboxylic acid (containing carboxyl [COOH] groups). These two functional groups react to form the characteristic ester linkage, a chemical group with the structure:

A polyester is made by a reaction involving an acid with two -COOH groups, and an alcohol with two -OH groups. In the common polyester drawn above: The acid is benzene-1,4-dicarboxylic acid (old name: terephthalic acid). The alcohol is ethane-1,2-diol (old name: ethylene glycol).

2009年1月1日 · Polyesters are condensation polymers or step-growth polymers and as such are quite different in polymerization chemistry, molecular structure and polymer architecture from addition polymers such as polyethylene, polypropylene and polyvinyl chloride (PVC).

2022年8月8日 · Polyester (PES) is an important type of synthetic fiber. It is made from purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (MEG) by esterification or ester exchange and condensation reaction. The molecular structure is …

2024年12月18日 · Polyester (CAS 113669-95-7) information, including chemical properties, structure, melting point, boiling point, density, formula, molecular weight, uses, prices, suppliers, SDS and more, available at Chemicalbook.

2023年1月10日 · The molecular structure of polyester fibers is essentially dependent on the spinning speed. At low take-up speeds (< 3200 m/min), polyester fibers have a predominantly amorphous structure. With increasing spinning speed, the macromolecules crystallize and a higher orientation of the macromolecules along the fiber axis results.

Polyester fibre is a “manufactured fibre in which the fibre 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–C 6 H 4 COOH)”. Figure 4.1 shows the chemical structure of polyethylene terephthalate (PET). The most widely used ...