Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (08): 9-14.doi: 10.13475/j.fzxb.20191202306

• Fiber Materials • Previous Articles     Next Articles

Thermal mechanical stability of ultrahigh molecular weight polyethylene fiber

ZHAN Xiaoqing, LI Fengyan(), ZHAO Jian, LI Haiqiong   

  1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2019-12-09 Revised:2020-03-21 Online:2020-08-15 Published:2020-08-21
  • Contact: LI Fengyan E-mail:fengyanli@tiangong.edu.cn

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Abstract:

Aiming at low melting point and easy creeping of ultrahigh molecular weight polyethy-lene (UHMWPE) fiber, the mechanical properties of UHMWPE at dry and wet heating was investigated, simulating the oilfield underground operation as the measurement conditions. The differential scanning calorimeter, thermal gravity, scanning electron microscopy, X-ray diffraction analyzer and energy dispersive spectrometer were used to characterize and analyze the heating property and microscopic images. The results show that with the etching by heat and treatment solution, obvious groove appears on the surface of the UHMWPE fibers. When treated with the same temperature, the loss in mechanical property is lower at wet heating than that at dry heating, especially when the fibers are wet heated at 70 ℃ for 30 d, the decrease of fibers strength could be controlled within 6%. However, with the increase of treatment temperature at a dry environment, the fibers strength decreases significantly, and particularly when the fibers are dry heated at 140 ℃ for 1 h, the maximum strength loss reaches 19.87%.

Key words: ultrahigh molecular weight polyethylene fiber, thermal stability, mechanical property, oilfield underground operation, high-performance fiber

CLC Number: 

  • TS101.3

Fig.1

Thermodynamic properties of UHMWPE. (a) TG-DTG curves; (b) DSC curve"

Tab.1

Mechanical properties of UHMWPE fibers treated with different time at 70 ℃"

处理时
间/d		 断裂强
度/MPa		 断裂强度
变化率/%		 断裂伸长
率/%		 断裂伸
长率变
化率/%
0 4 516±4.17 4.27±0.24
3 4 420±4.17 -2.1 4.80±0.44 +12.40
6 4 257±4.17 -5.7 4.30±0.13 +0.70
9 4 338±4.17 -3.9 4.48±0.15 +4.80
12 4 250±5.22 -5.9 4.76±0.19 +11.50
15 4 388±4.17 -2.8 4.93±0.13 +15.50
18 4 468±4.17 -1.1 4.77±0.14 +11.70
21 4 451±3.13 -1.4 4.85±0.09 +13.60
24 4 455±3.83 -1.4 4.83±0.11 +13.10
27 4 262±4.17 -5.6 4.56±0.11 +6.80
30 4 303±4.17 -4.7 4.52±0.16 +5.90

Fig.2

XRD spectra of UHMWPE fibers treated with different time"

Tab.2

Crystalline data of UHMWPE fibers treated with different time"

样品名称 2θ/(°) 半峰全宽 结晶度/%
UHMWPE原样 21.4 0.607 95.33
23.9 0.719
处理21 d 21.4 0.677 89.47
23.9 0.737
处理30 d 21.4 0.546 92.76
23.9 0.602

Fig.3

Effect of ageing temperature on UHMWPE fibers mechanical properties at wet-thermal treatment. (a) Break strength; (b) Elongation at break"

Tab.3

Content of metal element in different UHMWPE fibers%"

样品名称 Na Mg
UHMWPE原样 0.21 0.10
80 ℃处理 0.25 0.15
140 ℃处理 0.55 0.14

Fig.4

SEM images of UHMWPE fibers before and after wet-thermal treatment (×1 800). (a) Raw UHMWPE;(b) Treatment for 30 d at 70 ℃; (c) Treatment for 1 h at 140 ℃"

Fig.5

Mechanical properties of UHMWPE fibers after dry-thermal treatment at different temperature. (a) Break strength; (b) Elongation at break"

Fig.6

Mechanical properties UHMWPE before and after dry-thermal treatment at different time. (a) Break strength; (b) Elongation at break"

Fig.7

SEM images of UHMWPE fibers after dry-thermal treatment at 130 ℃ with different time(×1 800)"

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