Preparation And Spinnability Of Polyether Amide Copolymer

Polyamide(PA)fiber has high strength,excellent wearability and easy dyeing,however its elastic recovery is poor compared with spandex and other elastic fibers.Designing fiber polymers with structures similar to hard and soft segment microphase separation is a feasible strategy to improve the elasticity of PA fibers.In this research,two polyether amide block copolymers(PEBAx)with different soft segment structures were prepared and spun,using PA6/1012 copolymer as the hard segment and polyether amine(PEA)or polyethylene glycol(PEG)as the soft segment.The effects of structure,relative content,and molecular weight of soft and hard segments on the properties,spinnability,and fiber properties of PEBAx have been studied.The PEBAx prepared with PA6/1012 copolymer as the hard segment has good spinnability,and that spinning-drawing elastic fibers have excellent breaking strength and elastic recovery simultaneously.The breaking strength of elastic fibers with 30% soft segment content reaches 3.6 c N/dtex,and the elastic recovery rate is close to 100% at 30% constant elongation.The breaking strength of elastic fibers with 60% soft segment content reaches 1.16 c N/dtex,and the elastic recovery rate reaches 92% at 100% constant elongation.The breaking strength and elongation of elastic fibers can be improved by copolymerizing a certain amount of long-chain polyamide with PA6 into the hard segment;as the content of soft segments increases,the breaking strength of elastic fibers decreases and the elasticity improves;as the molecular weight of the soft segment increases,the breaking strength of the elastic fiber is not significantly affected,but its elasticity decreases caused by crystallizing of the soft segment.