Sh. Niu et T. Wakida, EFFECT OF HEAT-SETTING TEMPERATURE ON ALKALI HYDROLYSIS OF POLY(ETHYLENE-TEREPHTHALATE) FIBERS, Textile research journal, 63(6), 1993, pp. 346-350
Poly(ethylene terephthalate) (PET) fiber was heat set at 100 to 220-de
grees-C and then hydrolyzed with 10% aqueous sodium hydroxide solution
at 90-degrees-C for 60 and 120 minutes. Weight loss from the alkali h
ydrolysis initially decreased with increased heat-setting temperature
up to 140-degrees-C and then increased at temperatures above 140-degre
es-C. This phenomenon is similar to those with hydrazine treatment and
with disperse dyeing of heat-set PET fibers and can be attributed to
changes in the fine structure, especially in the amorphous regions of
the fiber, caused by heat-setting treatment at different temperatures.
Crystallinity and disperse dye uptake for the hydrolyzed PET fiber in
creased with hydrolysis, indicating differences in the fine structure
from the outer to the inner regions of the fiber.