Chemical Stability of Polyester

Published:

2023-02-25

① Acid resistance. Polyester fibers are very stable to acids (especially organic acids). After immersion in a 5% mass fraction hydrochloric acid solution at 100 ℃ for 24 hours, or in a 70% mass fraction sulfuric acid solution at 40 ℃ for 72 hours, their strength does not lose, but they cannot resist the long-term effects of concentrated nitric acid or concentrated sulfuric acid at room temperature.

② Alkali resistance. The ester groups on polyester macromolecules are easily hydrolyzed by alkali action. Interaction with concentrated alkali at room temperature and dilute alkali at high temperature can destroy fibers, and only at low temperatures can dilute or weak alkali be relatively stable.

③ Solvent resistance. Polyester has strong resistance to general nonpolar organic solvents, even to polar organic solvents at room temperature. For example, soaking in acetone, chloroform, toluene, trichloroethylene, and carbon tetrachloride at room temperature for 24 hours does not reduce fiber strength. Under heating, polyester fibers are soluble in mixed solvents such as phenol, xylenol, o-dichlorophenol, benzyl alcohol, nitrobenzene, and phenol carbon tetrachloride, phenol chloroform, and phenol toluene.

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