AABB type long-carbon chain polyether amide elastic fiber as well as preparation method and application thereof

The invention belongs to the field of polymer technology and particularly relates to AABB type long-carbon chain polyether amide elastic fiber as well as a preparation method and application thereof. The molecular chain of the elastic fiber is a block copolymer consisting of alternate soft-segment and hard-segment structures taking AABB type long-carbon chain polyamide as the hard segment and polyether as the soft segment. The invention also provides a preparation method of the polyether amide elastic fiber, wherein a one-step method or two-step method is adopted. According to the preparation method provided by the invention, the prepared long-carbon chain polyether amide elastic fiber integrates the advantages of long-carbon chain polyamide and polyether materials, has high tensile strength, good elastic recovery and good properties such as stable size, solvent resistance, wear resistance, aging resistance and hydrolysis resistance, is easy to dye and has uniform chromaticity after dyeing and is a novel elastic fiber with good elastic property. The high-grade elastic fiber can be applied to garment materials, medical auxiliary equipment and the like independently and/or through combination with other fiber.