Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (12): 97-102.doi: 10.13475/j.fzxb.20201103406

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Effects of supercritical CO2 fluid treatment time on structure and properties of diacetate fibers

ZHU Weiwei1,2, GUAN Liyuan1,2, LONG Jiajie1,2, SHI Meiwu1,2,3()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215123, China
    2. CTES Scientific Research Base for Waterless Coloration with Supercritical Fluid(Soochow University), Suzhou, Jiangsu 215123, China
    3. Institute of Quartermaster Engineering & Technology, Institute of System Engineering, Academy of Military Sciences, Beijing 100010, China
  • Received:2020-11-16 Revised:2021-09-15 Online:2021-12-15 Published:2021-12-29
  • Contact: SHI Meiwu E-mail:shimeiwu@263.net.cn

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Abstract:

In order to functionally finish diacetate fibers using supercritical CO2 fluid technology, which gives high added value to diacetate fibers, the effects of supercritical CO2 fluid treatment time on surface morphology, chemical structure,aggregation structure,thermal property and tensile strength of diacetate fiber were investigated by means of scanning electron microscope, Fourier infrared spectrometer, X-ray polycrystalline diffractometer, thermogravimetric analyzer, differential scanning calorimetry and universal strength tester. Results show the particulate impurities are removed on the surface of the diacetate fiber treated by supercritical CO2 fluid for 60, 90 and 120 min, and the order of the molecular chain decreased, as well as the crystallinity of diacetate fibers decreases from 39.41% of untreated fiber to 35.33%, 31.57%, 36.10% respectively, and the breaking strength of fiber decreased first and then increased. After 120 min of supercritical CO2 fluid treatment, the breaking strength of hydrogen bond between molecular chains of diacetate fibers shows a slight decrease. The melting point of the diacetate fibers is basically the same, and the mass loss rate of fiber increase from 89.52% to 95.66% in high temperature.

Key words: supercritical CO2 fluid, diacetate fiber, surface morphology, aggregation structure, thermal stability, breaking strength

CLC Number: 

  • TS195.6

Fig.1

SEM images of diacetate fibers treated by supercritical CO2 fluid at different time(×1 000). (a)Untreated samples; (b)60 min; (c) 90 min; (d)120 min"

Fig.2

FT-IR spectra of diacetate fibers treated by supercritical CO2 fluid at different time"

Fig.3

XRD images of diacetate fibers treated by supercritical CO2 fluid at different time"

Tab.1

Results of thermal degradation property of diacetate fibers treated by supercritical CO2 fluid at different time"

处理时间/
min		 起始分解
温度/℃		 最大分解速率
对应温度/℃		 质量损
失率/%
0 341.0 366.3 89.52
60 341.6 367.7 91.40
90 341.8 367.6 89.64
120 338.5 363.3 95.66

Fig.4

Thermal degradation curves of diacetate fibers treated by supercritical CO2 fluid with different time. (a) Thermogravimetric curve; (b) Derivative thermogravimetric Curve"

Tab.2

DSC data of diacetate fibers treated by supercritical CO2 fluid at different time"

处理
时间/
min		 第1个峰 第2个峰 第3个峰 玻璃化
转变温
度/℃
温度/
℃		 热焓/
(J·g-1)		 温度/
℃		 热焓/
(J·g-1)		 温度/
℃		 热焓/
(J·g-1)
0 91.46 62.724 2 204.27 2.717 9 233.35 6.807 6 194.62
60 88.85 85.406 1 201.37 2.513 0 233.12 6.416 9 195.98
90 73.61 19.074 3 202.92 2.702 3 233.17 6.249 1 196.59
120 102.41 102.273 2 202.57 2.762 4 233.48 6.418 8 194.80

Fig.5

Heating curves of diacetate fibers treated by supercritical CO2 fluid at different time. (a)Heating curve for first time; (b)Heating curve for second time"

Tab.3

Tensile breaking strength of diacetate fibers treated by supercritical CO2 fluid at different time"

处理时间/min 断裂强力/cN 断裂强力变化率/%
0 3.20
60 2.92 -8.75
90 3.48 8.75
120 3.35 4.69
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