Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (03): 8-14.doi: 10.13475/j.fzxb.20190302507

• Fiber Materials • Previous Articles     Next Articles

Effect of supercritical CO2 treatment temperature on structure and property of diacetate fiber

ZHU Weiwei1, CAI Chong2,3, ZHANG Cong2,3, LONG Jiajie2,3, SHI Meiwu1,3,4()   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215000, China
    3. National Scientific Research Base for Waterless Coloration with Supercritical Fluid, Soochow University, Suzhou, Jiangsu 215123, China
    4. Institute of Quartermaster Engineering & Technology, Institute of System Engineering, Academy of Military Science, Beijing 100010, China
  • Received:2019-03-12 Revised:2019-12-17 Online:2020-03-15 Published:2020-03-27
  • Contact: SHI Meiwu E-mail:shimeiwu@263.net.cn

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Abstract:

In order to develop applications of supercritical CO2 technology in processing diacetate fibers, supercritical CO2 treatment to diacetate fibers at different temperatures was carried out. The fiber surface morphology,chemical structure, aggregation structure, thermal degradation property, thermal stability and tensile strength were investigated respectively by scanning electron microscope technology, infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry and universal strength tester. The results indicate that the crystallinity of diacetate fibers decrease from 39.41% to 32.43%, 31.57% and 32.16% respectively under different treatment temperatures(80, 100, 120 ℃). When the temperature is 120 ℃ some hydrogen bonds in diacetate fibers are destroyed, and the thermal resistance and thermal stability of diacetate fibers decrease slightly, but the surface morphology and chemical structure of diacetate fibers are virtually unchanged, and tensile strength remains to be about 3.20 cN.

Key words: supercritical CO2, diacetate fiber, surface morphology, aggregation structure, thermal degradation property, thermal stability, tensile strength

CLC Number: 

  • TS195.6

Fig.1

SEM images of diacetate fibers at different treatment temperatures (×1 000)"

Fig.2

FT-IR spectra of diacetate fibers at different treatment temperatures"

Fig.3

XRD patterns of diacetate fibers at different treatment temperatures"

Fig.4

TG(a) and DTG(b) curves of diacetate fibers"

Fig.5

DSC analysis curve of diacetate fibers. (a)Heating curve for the first time; (b)Heating curve for the second time"

Tab.1

DSC data of diacetate fibers at different treatment temperatures"

处理温度/℃ 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)
未处理样 91.46 62.724 2 204.27 2.717 9 233.35 6.807 6 194.62
80 89.02 18.266 6 201.64 2.736 2 233.22 5.275 2 195.60
100 73.61 19.074 3 202.92 2.702 3 233.17 6.249 1 196.59
120 95.91 74.741 0 201.57 2.945 5 233.32 6.077 4 194.29

Tab.2

Effect of treatment temperature on tensile strength of diacetate fibers in supercritical CO2"

处理温度/℃ 断裂强力/cN 强力变化率/%
未处理样 3.20 —
80 2.85 -10.94
100 3.48 8.75
120 2.90 -9.38
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