Easy hydrolytic degradation polyester (EHDPET) is synthesized by esterification polycondensation using terephthalic acid (PTA)

isophthalic acid (IPA)

poly(ethylene glycol)(PEG)

ethylene glycol(EG)

and 1

3-di-(2-hydroxyl ethyl) isophthalate 5-sulfonic acid soldium (SIPE). This kind of copolymer is hydrolytic degradable in hot water or NaOH solution. During the synthesis of EHDPET

the melt viscosity is increased with the addition of SIPE

while decreased with the addition of PEG.In contrast with common polyester

the crystalline temperature of EHDPET is higher

at the same time

the melting temperature and glass transition temperature are lower

The hyldrolytic degradation behaviors change with the chemical composition

physical structure

and the hydrolytic conditions of EHDPET. The hydrolytic degradation property is improved by the increase of proportion of SIPE and IPA during the synthesis. The increase of the teperature and the concentration of NaOHsolution also accelerate the hydrolytic degradation. Compared with as-spun fiber

the hydrolytic degradation of the drawn and set fiber decreases.