Effects of the Molecular Weight Distribution of Recycled Cotton Pulp on Its Lyocell Spinning and Fiber Mechanical Properties

Xiang Yao; Yang Liu; Hao Li; Ge-sheng Yang; Yao-peng Zhang

doi:10.11777/j.issn1000-3304.2024.24200

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Effects of the Molecular Weight Distribution of Recycled Cotton Pulp on Its Lyocell Spinning and Fiber Mechanical Properties

Research Article | 更新时间：2025-01-26

- Effects of the Molecular Weight Distribution of Recycled Cotton Pulp on Its Lyocell Spinning and Fiber Mechanical Properties
- Acta Polymerica Sinica Vol. 56, Issue 1, Pages: 135-144(2025)
- 作者机构：
  
  1.东华大学，纤维材料改性国家重点实验室，上海 201620
  2.东华大学，材料科学与工程学院，上海 201620
- 作者简介：
  
  Yao-peng Zhang, E-mail: zyp@dhu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2024.24200
  CLC：
- CSTR：32057.14.GFZXB.2024.7293
- Published：20 January 2025，
  
  Published Online：27 November 2024，
  
  Received：17 July 2024，
  
  Accepted：2024-09-24
- 稿件说明：
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姚响, 刘洋, 李浩, 杨革生, 张耀鹏. 废旧棉再生浆粕分子量分布对其Lyocell纺丝及纤维力学性能的影响. 高分子学报, 2025, 56(1), 135-144

Yao, X.; Liu, Y.; Li, H.; Yang, G. S.; Zhang, Y. P. Effects of the molecular weight distribution of recycled cotton pulp on its lyocell spinning and fiber mechanical properties. Acta Polymerica Sinica, 2025, 56(1), 135-144
姚响, 刘洋, 李浩, 杨革生, 张耀鹏. 废旧棉再生浆粕分子量分布对其Lyocell纺丝及纤维力学性能的影响. 高分子学报, 2025, 56(1), 135-144 DOI： 10.11777/j.issn1000-3304.2024.24200. CSTR： 32057.14.GFZXB.2024.7293.

Yao, X.; Liu, Y.; Li, H.; Yang, G. S.; Zhang, Y. P. Effects of the molecular weight distribution of recycled cotton pulp on its lyocell spinning and fiber mechanical properties. Acta Polymerica Sinica, 2025, 56(1), 135-144 DOI： 10.11777/j.issn1000-3304.2024.24200. CSTR： 32057.14.GFZXB.2024.7293.

摘要

为弄清再生浆粕的分子量分布特征对其Lyocell纺丝稳定性和纺制纤维性能的影响规律，本研究首先制备了8种不同聚合度的废旧棉再生浆粕原料，随后基于浆粕复配策略获得平均聚合度相当、分子量分布逐渐变宽的5种再生浆粕CRP 1#~CRP 5# (多分散指数PDI=3.54~5.34)，进一步系统考察了浆粕分子量分布特征对其纺丝液流变行为、纺丝稳定性，以及对应纤维力学特性的影响. 结果表明：当浆粕平均聚合度为558左右时，随着浆粕分子量分布的变宽，其纺丝液表观黏度逐渐下降，黏弹性转变点所对应的储存模量和损耗模量减小. 纤维的综合力学性能在CRP 1#~CRP 3# (PDI=3.54~4.00)之间可获得较好的维持，当PDI增大到4.098 (CRP 4#)之后则发生较为明显的下降. 综合来看，在一定范围内适当增宽浆粕的分子量分布有利于降低纺丝液的黏度但不会显著影响纤维的综合力学性能. 然而，当分子量分布过宽时，浆粕的纺丝稳定性会变差，纤维的综合力学性能也会明显下降. 本研究有望为有效扩大废旧含棉织物原料及再生浆粕的利用范围，或是基于复配策略提升较高聚合度浆粕的可纺性、进而纺制高性能Lyocell纤维提供理论指导和实验依据.

Abstract

Due to the significant batch to batch differences in waste cotton textiles

obvious fluctuations in the degree of polymerization (DP) and molecular weight distribution (MWD) of the recycled pulp will inevitably occur. To expand the utilization range of recycled pulp

pioneer researches have proposed a pulp blending spinning strategy

which further magnified the fluctuations of the MWD of related recycled pulps. The MWD of polymers is a quite important feature to influence related rheological behavior and processability of the polymer solutions or polymer melts. To reveal the effect of the MWD of recycled pulp on its Lyocell spinning stability and comprehensive fiber mechanical properties

five kinds of combined recycled pulps (CRP 1#-CRP 5#) with similar average DP while different MWD (PDI from 3.54 to 5.34) were prepared by blending proper ratios of recycled pulps with different DP. The recycled pulps with different DP were fabricated by adjusting the fabrication process and raw waste textile materials. Furthermore

-methylmorpholine-

-oxide was used to dissolve the CRP 1#-CRP 5# to form corresponding spinning solutions. Then

the effects of MWD on the spinnability of corresponding spinning solutions

and the comprehensive mechanical properties of the regenerated Lyocell fibers were systematically investigated. Results illustrated that when fixed the average DP of the CRPs at around 558

with the increase of MWD (PDI from 3.54 to 5.34)

the apparent viscosity of the

spinning solutions was gradually decreased

the storage and loss modulus under corresponding viscoelastic transition point were also gradually decreased. The comprehensive mechanical properties of the corresponding Lyocell fibers could be well maintained among CRP 1#

CRP 2# and CRP 3# (PDI from 3.54 to 4.00)

while a significant decrease occurred when the PDI of CRP increases to about 4.10 (CRP 4#). Overall

suitable widening the MWD of related recycled pulp is expected to be beneficial for reducing the viscosity of the spinning solution while does not significantly affect the comprehensive mechanical properties of the regenerated Lyocell fibers. However

an excessively wider MWD is not conducive to the spinnability of the pulp and the maintenance of the comprehensive mechanical properties of the resulting fibers. The relevant researches are expected to provide theoretical guidance and experimental basis for expanding the utilization range of recycled cotton pulps from varied waste textiles. It could also be used for guiding the spinning of recycled pulp with higher DP based on pulp bending strategy

thus providing guidance for obtaining high performance Lyocell fibers.

关键词

废纺高值回收利用废旧棉再生浆粕分子量分布Lyocell纤维浆粕复配纺丝

Keywords

High value recycling of waste textileRecycled pulp from waste cotton textilesMolecular weight distributionLyocell fiberPulp blending spinning

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