Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (08): 1-7.doi: 10.13475/j.fzxb.20210300507

• Academic Salon Column for New Insight of Textile Science and Technology: Recycling and Biodegradable Fiber •     Next Articles

Study on structure and moisture absorption and liberation properties of bio-based polyamide 56 and polyamide 66

WANG Jianming1, LI Yongfeng1,2, HAO Xinmin2(), YAN Jinlong2, QIAO Rongrong2, WANG Meihui2   

  1. 1. School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
    2. Institute of Quartermaster Engineering & Technology, Systems Engineering Institute, Academy of Military Sciences, Beijing 100010, China
  • Received:2021-03-01 Revised:2021-05-17 Online:2021-08-15 Published:2021-08-24
  • Contact: HAO Xinmin E-mail:xminhao@126.com

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Abstract:

Aiming at the analyse of moisture absorption and liberation properties of bio-based polyamide 56 and polyamide 66, characteristic curves of moisture absorption and liberation, and drying of bio-based polyamide 56 draw texturing yarn (DTY), polyamide 66 DTY, bio-based polyamide 56 and polyamide 66 staple fiber were obtained by testing under the standard condition. According to the characteristic curves, the regression equation of moisture regain or moisture content to time were deduced during the moisture absorption, liberation and drying equilibrium process for the four types of fibers under the standard testing conditions. The results show that under standard atmospheric conditions, bio-based polyamide 56 fiber has a higher moisture absorption and liberation balance, higher moisture absorption and drying rates, and a slightly lower initial moisture release rate compared with the polyamide 66 fiber. However, bio-based polyamide 56 has a higher moisture release rate than polyamide 66 with the increase of time. The moisture absorption isotherms of the four types of fibers are all in a reverse "S" shape. In a high humidity environment, the drying property of bio-based polyamide 56 is better than that of polyamide 66, i.e., bio-based polyamide 56 has better quick-drying performance.

Key words: bio-based polyamide 56, polyamide 66, fiber structure, moisture adsorption property, moisture liberation property

CLC Number: 

  • TS102.5

Fig.1

DSC (a) and XRD (b) curves of four kinds of polyamide fiber"

Tab.1

Melting point and crystallinity of four kinds of polyamide fibers"

纤维种类 熔点/℃ 结晶度/%
生物基PA56 DTY 250.2 43.3
PA66 DTY 254.4 58.9
生物基PA56 短纤维 249.9 37.0
PA66 短纤维 250.6 44.4

Fig.2

Moisture absorption and liberation curves of four kinds of polyamide fiber. (a) Bio-based PA56 DTY and PA66 DTY; (b) Bio-based PA56 staple fiber and PA66 staple fiber"

Fig.3

Drying curves of four kinds of polyamide fibers in standard atmosphere. (a) Bio-based PA56 DTY and PA66 DTY; (b) Bio-based PA56 staple fiber and PA66 staple fiber"

Tab.2

Regression equation to time of moisture absorption, liberation regain and drying moisture content"

纤维种类 吸湿回归方程 放湿回归方程 干燥回归方程
生物基PA56 DTY W 吸 = 4.461 - 4.195 e - 0.08812 t W 放 = 4.801 - 7.779 e - 0.04445 t W 干 = 3.783 + 27.458 e - 0.00705 t
PA66 DTY W 吸 = 3.676 - 3.562 e - 0.09457 t W 放 = 3.913 - 5.821 e - 0.06644 t W 干 = 2.255 + 29.337 e - 0.00582 t
生物基PA56短纤维 W 吸 = 4.991 - 4.951 e - 0.06294 t W 放 = 5.241 - 7.017 e - 0.02785 t W 干 = 4.392 + 27.153 e - 0.00898 t
PA66短纤维 W 吸 = 4.251 - 4.220 e - 0.06394 t W 放 = 4.358 - 5.999 e - 0.05478 t W 干 = 3.239 + 28.636 e - 0.00271 t

Tab.3

Regression equation to time of moisture absorption, liberation and drying rate"

纤维种类 吸湿速率回归方程 放湿速率回归方程 干燥速率回归方程
生物基PA56 DTY υ吸=0.369 7e-0.088 12t υ放=0.345 8e-0.044 45t υ干=0.193 6e-0.007 05t
PA66 DTY υ吸=0.336 8e-0.094 57t υ放=0.386 7e-0.066 44t υ干=0.170 7e-0.005 82t
生物基PA56短纤维 υ吸=0.311 6e-0.062 94t υ放=0.195 4e-0.027 85t υ干=0.243 8e-0.008 98t
PA66短纤维 υ吸=0.269 8e-0.063 94t υ放=0.328 6e-0.054 78t υ干=0.206 5e-0.007 21t

Fig.4

Regression curves of moisture absorption rate of bio-based PA56、PA66 DTY and staple fiber"

Fig.5

Regression curves of moisture liberation rate of bio-based PA56、PA66 DTY and staple fiber"

Fig.6

Regression curves of drying rate of bio-based PA56、PA66 DTY and staple fiber"

Fig.7

Moisture absorption isotherms of four kinds of polyamide fibers"

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