Polyester fabrics are widely accepted by consumers for their easy-care properties, versatility, and longevity, despite this there are still complaints about their hand, thermal properties and moisture absorption. The hygroscopicity of polyester fibers can be improved by introducing hydrophilic block copolymers. However, this modification can lead to problems such as longer drying times, excessive wrinkling and wet sticking. Furthermore, water penetration into the interior of the fibers did not significantly improve perceived comfort

　　Polyester fibers are susceptible to alkalis, depending on their ionic properties. Ionizable bases such as caustic soda, caustic potash, and limewater affect only the outer surface of polyester filaments. On the other hand, the primary and secondary bases and ammonia can diffuse into polyester fibers and attack deeply, resulting in the breakage of polyester chain molecules due to amide formation, one of which is the controlled hydrolysis of polyester. The action of the strong base causes the breakage of the ester bonds on the fiber surface, resulting in the formation of terminal hydroxyl groups and carboxylate groups on the fiber surface. It is believed that hydrolysis increases the number of polar functional groups on the fiber surface.

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