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  

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

作　　者：姚响 刘洋[1,2] 李浩 杨革生[1,2] 张耀鹏[1,2] Xiang Yao;Yang Liu;Hao Li;Ge-sheng Yang;Yao-peng Zhang(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620;College of Materials Science and Engineering,Donghua University,Shanghai 201620)

机构地区：[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

出　　处：《高分子学报》2025年第1期135-144,共10页Acta Polymerica Sinica

基　　金：中央高校基本科研业务费专项基金(基金号2232024D-01);国家重点研发计划(项目号2020YFC1910303)资助.

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.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,N-methylmorpholine-N-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 compr

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 

分 类 号：TQ340.64[化学工程—化纤工业]