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Research on Structure and Elastic Behavior of Polyolefin Based Elastic Fiber and Core-Spun Yard

Author: ChenXiZuo
Tutor: YuJianYong；WangNi
School: Donghua University
Course: Textile Material and Textiles Design
Keywords: New polyolefin elastic fibers Structure Elastic behavior Core yarn
CLC: TS154
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 0
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Abstract

The novel polyolefin elastic fiber of ethylene with another or several olefin copolymer into the network with a partially crosslinked polymer material. It has good elasticity and recovery properties and excellent chemical resistance, heat resistance, and to improve the comfort and functionality of the fabric is gradually applied in textiles. New polyolefin elastic fiber core yarn structure and elastic behavior, the subject is the main object of study, systematic analysis of the structure of the fiber, elastic behavior, the the new polyolefin elastic fibers / cotton core-spun process and influencing factors as well as physical, chemical deal with the impact of the elasticity of the fiber and core yarn. The following conclusions: a fiber cross-sectional circular rectangular, no sheath-core or other composite structure, smooth surface; no double bond is present in the fiber molecular structure, or other non-hydrocarbon substance, chemical structure and stability; lower degree of crystallinity, including The two crystalline structures; fiber of low melting point, for high elastic state at room temperature, a glass transition temperature of -32.3 ° C. 2, the breaking strength of the fiber is less than spandex, higher elongation at break and initial modulus, good ductility than the shot area of ??spandex; preferably in low stretching region elastic recovery, with the number of cyclic tensile elastic recovery rate and an increase of elongation decreases; test the resilience recommended using Reply pause time 60s, recovers sufficiently so that its elasticity. 3, twist, draft multiple of the core wire and core wire content of the core yarn tensile and elastic recovery properties have a significant impact. With increasing twist, the new polyolefin elastic fibers / cotton core-spun yarn fracture strength first increases and then decreases, elastic recovery is improved; With the increase in core wire pre-draft multiple, the breaking strength of core yarn first increases and then decreases, elongation at break decreased elastic recovery rate increased significantly; core wire content of the core-spun yarn breaking strength and elongation at break decreases; Hearle spun yarn theory combined yarn structure, The derivation of the tensile stress-strain relation. 4, the new polyolefin elastic fibers / cotton core-spun yarn and spandex yarn tensile curve similar the new polyolefin elastic fiber core yarn elongation at break, less stress low strain; novel polyolefin elastic fiber / cotton core-spun elastic recovery rate decreases with increasing elongation, constant load elastic recovery rate downward trend as the load increases, the amplitude ratio spandex yarn; the new polyolefin elastic fibers cored The creep elongation yarn spandex core yarn, good dimensional stability; take advantage of the success of the four-element model simulation yarn creep curve. 5 new polyolefin heat treatment of the relaxation of elastic fibers, elastic recovery rate increased with the increase of the treatment temperature decreases, the plastic deformation first decreases gradually increased to a value similar to the untreated before, tensile strength continues to decrease ; fixed-length heat treatment of the polyolefin elastic fibers, elastic recovery improved, the elastic recovery of the fiber when the treatment temperature is higher than the melting temperature sharply; corespun, elastic recovery rate decreased by heat treatment at 90 ℃ amplitude plastic deformation rate is slightly increased, and significantly improve the tensile strength; when the processing temperature was raised to 170 ° C, the elastic recovery rate of the yarn is improved, the rate of plastic deformation and tensile strength are small, indicating that the new polyolefin elastomer the heat treatment temperature range of the fiber is larger. 6, the sulfuric acid solution, the alkali treatment and the oxidizing agent treatment of the elastic behavior of the fiber has little effect, and improvement in the stretching zone and high elastic recovery rate, the elastic fibers of the novel polyolefin textile commonly used chemical reagent treatment of elasticity after little loss. conducive to the further application of the fibers. 7 corespun by alkali treatment after fracture strength decreased, breaking elongation, tensile modulus becomes smaller, the elastic recovery rate and the tensile strength significantly decreases; breaking strength of the hydrogen peroxide solution treatment corespun smaller , elongation at break and tensile modulus without significant change; after treatment of the sulfuric acid solution and sodium hypochlorite solution, the elastic recovery rate of the yarn and tensile strength becomes small, wherein the sodium hypochlorite solution for processing the yarn after the elastic recovery rate decreased amplitude . Therefore, textile processing needs to pay attention to the reduction in the strength loss of the yarn and the elastic recovery rate after the chemical treatment.

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