纤维素性质对纤维素溶液可纺性以及纤维性能的影响?
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摘要
采用热台偏光显微镜跟踪观察了不同纤维素浆粕在N-甲基吗啉-N-氧化物一水合物(NMMO·H_2O)中的溶解过程,并利用哈克旋转流变仪分析了其溶液的流变性能。研究结果发现:纤维素的聚合度越高,温度对纤维素的溶解过程影响越大;相同纤维素浓度下,随着纤维素的聚合度的增加,溶液的结构粘度指数(△_η)、粘流活化能(E_η)以及弹性增大,即溶液可纺性下降,粘度对温度更加敏感。在此基础上,进一步探讨了纤维素性质对纤维性能的影响,结果表明Lyocell纤维的力学性能随纤维素聚合度以及纺丝液浓度的提高而提高,可纺浓度随聚合度的提高而下降。
The dissolution of cellulose pulps with different degree of polymerization(DP) in NMMO·H_2O were observed by a polarizing microscopy with a heating stage and the rheological properties of the solutions were analyzed by HAAKE rheometer. It was found that the higher the DP of cellulose, the stronger the dependence of dissolving rate on temperature. With the increase of DP of cellulose, the structural viscosity index(△_η), viscous flow activation energy(Eh) and elastic property of the cellulose solution increased under the same cellulose concentration, indicating that the dope has poorer spinnability and the viscosity are more sensitive to temperature.On the basis of the above study, the effect of cellulose's feature on the mechanical properties of Lyocell fiber was also investigated. The results showed that the mechanical properties of Lyocell fiber increased with the increase of DP of cellulose and the concentration of cellulose in solution with good spinnability decreased with the increase of DP.
The dissolution of cellulose pulps with different degree of polymerization(DP) in NMMO·H_2O were observed by a polarizing microscopy with a heating stage and the rheological properties of the solutions were analyzed by HAAKE rheometer. It was found that the higher the DP of cellulose, the stronger the dependence of dissolving rate on temperature. With the increase of DP of cellulose, the structural viscosity index(△_η), viscous flow activation energy(Eh) and elastic property of the cellulose solution increased under the same cellulose concentration, indicating that the dope has poorer spinnability and the viscosity are more sensitive to temperature.On the basis of the above study, the effect of cellulose's feature on the mechanical properties of Lyocell fiber was also investigated. The results showed that the mechanical properties of Lyocell fiber increased with the increase of DP of cellulose and the concentration of cellulose in solution with good spinnability decreased with the increase of DP.
引文
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[13]李婷.Lyocell纤维生产用纤维素溶胀工艺的研究[J].化工新型材料,2018,46(5):245-248.
[14]张慧慧,彭顺金,邵惠丽,等.用于制备高强Lyocell纤维的纤维素混合浆粕的研究[J].合成纤维,2007,36(1):21-24.
[15]杨革生,冯坤,邵惠丽,等.竹纤维素/NMMO·H2O溶液流变性能的研究[J].纤维素科学与技术,2008,16(3):54-59.
[16]Schramm G著.李晓晖译.实用流变测量学[M].北京:石油工业出版社,1998:27-31.
[17]魏孟媛.轮胎帘子线用Lyocell纤维的研制[D].上海:东华大学,2009.
[2]沈弋弋,刘瑞刚,胡学超.纤维素/NMMO·H2O浆液的流变性能[J].中国纺织大学学报,2000,26(5):1-7.
[3]Chanzy H,Nawrot S,Perez S,et al.Proceeding of the TAPPI international dissolving and speciality pulps conference[C].Boston,1983:127-132.
[4]董纪震,罗鸿烈,王庆瑞,等.合成纤维生产工艺学(上)[M].第二版.北京:纺织工业出版社,1993:93-160.
[5]Motimer S A,Peguy A A.The formation of structure in the spinning and coagulation of Lyocell fibers[J].Cellulose Chemistry Technology,1996,30(3):117-132.
[6]Schulz L,Seger B,Burchard W.Structure of cellulose in solution[J].Macromolecule Chemistry Physical,2000,201(3):2008-2022.
[7]顾广新,沈弋弋,胡学超,等.纤维素/NMMO/H2O纺丝液组成的表征[J].合成纤维,2001,30(1):32-34.
[8]Liu R G,Shao H L,Hu X C.The online measurement of Lyocell fibers and investigation of elongational viscosity of cellulose N-methylmorpholine-N-oxide monohydrate solutions[J].Macromolecule Material Engineering,2001,286(1):1-8.
[9]张慧慧,魏孟媛,邵惠丽,等.浆粕原料对轮胎帘子线用Lyocell纤维性能的影响[J].东华大学学报(自然科学版),2010,36(5):486-490,558.
[10]Berger W,Keck M,Philipp B.On the mechanism of cellulose dissolution in O-basic system[J].Cellulose Chemistry Technology,1998,32(2):387-397.
[11]Woodings C R.The development of advanced cellulosic fibers[J].International Journal Biology Macromolecule,1995,17(3):305-309.
[12]Chanzy H,Chumpitazi B,Peguy A A.Solutions of polysaccharides in N-methylmorpholine N-oxide(NMMO)[J].Carbohydrate Polymer,1982,2(1):35-42.
[13]李婷.Lyocell纤维生产用纤维素溶胀工艺的研究[J].化工新型材料,2018,46(5):245-248.
[14]张慧慧,彭顺金,邵惠丽,等.用于制备高强Lyocell纤维的纤维素混合浆粕的研究[J].合成纤维,2007,36(1):21-24.
[15]杨革生,冯坤,邵惠丽,等.竹纤维素/NMMO·H2O溶液流变性能的研究[J].纤维素科学与技术,2008,16(3):54-59.
[16]Schramm G著.李晓晖译.实用流变测量学[M].北京:石油工业出版社,1998:27-31.
[17]魏孟媛.轮胎帘子线用Lyocell纤维的研制[D].上海:东华大学,2009.