Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (12): 27-31.doi: 10.13475/j.fzxb.20181205305

• Fiber Materials • Previous Articles     Next Articles

Influence of pressure on rheological behavior of polyethylene terephthalate-polyamide 6 copolymer/polyamide 6 blends

GUO Zengge1, JIANG Zhaohui1(), JIA Zhao1, PU Congcong1, LI Xin2, CHENG Bowen3   

  1. 1. Lutai School of Textile and Apparel, Shandong University of Technology, Zibo, Shandong 255000
    2. State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy, Beijing 100025, China
    3. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
  • Received:2018-12-25 Revised:2019-08-15 Online:2019-12-15 Published:2019-12-18
  • Contact: JIANG Zhaohui E-mail:jiangzhaohui@sdut.edu.cn

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Abstract:

In order to study the rheological properties of polymers under high pressure, blends of polyethylene terephthalate-polyamide 6 copolymer (PET-PA6) and polyamide 6(PA6) were prepared by melt blending and co-extruding. The influence of pressure, shear rate and temperature on the rheological behavior of PET-PA6/PA6 blends were studied under the conditions of the outlet pressure of the capillary tube of 5-50 MPa controlled by a cock mounted at the end of the reverse pressure chamber. The results indicate that the shear viscosity of PET-PA6/PA6 blends conforms to the Barus equation with the change of pressure. At a constant shear rate, the shear viscosity of PET-PA6/PA6 blends increases gradually with the capillary pressure. When the shear rate is increased from 108 s-1 to 1 080 s-1, the pressure coefficient decreases by 19.24%, and when the temperature is increased from 265 to 290 ℃, the pressure coefficient decreases by 32.33%. The dependence of shear viscosity of PET-PA6/PA6 blends on pressure decreases with the shear rate and the temperature.

Key words: polyethylene terephthalate-polyamide 6 copolymer, polyamide 6, shear viscosity, rheological behavior, pressure coefficient

CLC Number: 

  • TQ311

Fig.1

Diagram of reverse pressure chamber structure"

Fig.2

Relationship between η and Pm at different temperature"

Tab.1

Δη of mixture at different temperature and shear rates"

γ·a/
s-1		 Δη/(Pa·s)
265 ℃ 270 ℃ 275 ℃ 280 ℃ 285 ℃ 290 ℃
108 194.67 187.67 115.85 99.87 93.87 91.87
216 168.98 182.97 109.13 94.95 86.90 85.92
432 164.85 156.94 99.81 86.21 84.34 83.34
648 140.19 130.19 90.06 80.30 77.30 76.30
864 114.49 111.49 79.91 74.09 73.09 69.09
1 080 94.81 88.81 69.14 66.14 63.79 63.14

Fig.3

Relationship between η and Pm of mixture"

Tab.2

Average pressure coefficients at different shear rates and temperatures"

γ·a 108 s-1 216 s-1 432 s-1 648 s-1 864 s-1 1 080 s-1
β 15.95 15.30 14.36 13.52 13.00 12.88
T 265 ℃ 270 ℃ 275 ℃ 280 ℃ 285 ℃ 290 ℃
β 16.92 16.05 14.83 13.42 12.34 11.45
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