Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (02): 63-68.doi: 10.13475/j.fzxb.20220806106

• Fiber Materials • Previous Articles     Next Articles

Polyethylene glycol modified thermoplastic epoxy resin and its spinnability

HU Baoji, ZHANG Qiaoling, WANG Xu()   

  1. School of Fashion, Henan University of Engineering, Zhengzhou, Henan 451191, China
  • Received:2022-08-16 Revised:2022-11-20 Online:2023-02-15 Published:2023-03-07

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Abstract:

Objective Thermoplastic epoxy resin has excellent mechanical properties and can be melted and reprocessed, but its melting processing temperature is relatively high which needs to be reduced. In order to develop thermoplastic epoxy resin as textile material and to reveal its potential application in the engineering field, on the basis of studying its mechanical and thermodynamic properties, the spinning temperature of thermoplastic epoxy resin needs to be regulated by melting dispersion polyethylene glycol (PEG).
Method Thermoplastic epoxy resin film was prepared by polymerizing-hot pressing process. The pellets of thermoplastic epoxy resin/PEG were further developed by the process of PEG melt-dispersion, and the epoxy resin/PEG filament was prepared by the process of melt-drawing. The mechanical and thermodynamic properties of thermoplastic epoxy resin film were analyzed. The influence of PEG on the spinnability of thermoplastic epoxy resin was discussed, and the mechanical and thermodynamic properties of PEG modified epoxy resin/PEG filament were analyzed.
Results The yield stress of the thermoplastic epoxy resin film is found to reach 64.6 MPa and the breaking strain 117.4%. The storage modulus of thermoplastic epoxy resin film at 25 ℃ is found as high as 2 296 MPa, and the glass transition temperatures 100.2 ℃. PEG significantly reduces the extrusion force of epoxy resin/PEG pellets. Compared with pure epoxy resin pellets, the extrusion force of epoxy resin/PEG pellets with 5% PEG content is reduced by 870 N at 300 ℃. The spinning temperature of pure thermoplastic epoxy resin pellets is as high as 300 ℃, and the extrusion force is about 1.92 kN at this spinning temperature. With the increase of PEG content, the extrusion force of epoxy resin/PEG pellets can reach about 1.9 kN during the spinning of pure epoxy resin pellets at lower temperature. Epoxy resin/PEG pellets with different PEG content can be spun into epoxy resin/PEG filament by melt-drawing process at the mixing temperature of 290 ℃ (PEG content: 2.5%), 280 ℃ (PEG content: 5%) and 270 ℃ (PEG content: 7.5%), respectively. Compared with pure epoxy resin pellets, the spinning temperature of epoxy resin/PEG pellets with 7.5% PEG content decreased by 30 ℃. PEG also improves the drawing effect of thermoplastic epoxy resin in spinning. In terms of diameter, the diameter of the epoxy resin/PEG filament with 7.5% PEG content is 50 μm lower than that of the pure epoxy resin filament. Compared with pure epoxy resin filament, the mechanical properties of thermoplastic epoxy resin/PEG filament are significantly improved; the breaking strain and breaking stress of the epoxy resin/PEG filament with 2.5% PEG content were increased by 60% and 20 MPa, respectively. PEG reduces the glass transition temperature of epoxy resin/PEG filament. Compared with pure epoxy resin filament, the glass transition temperature of epoxy resin/PEG filament with 7.5% PEG content is reduced by 20.9 ℃.
Conclusion Thermoplastic epoxy resin film developed in this research has high mechanical properties and thermal stability. The thermoplastic epoxy resin has the advantages of melting and reprocessing. At the same spinning temperature, the PEG-dispersed thermoplastic epoxy resin pellets have a lower extrusion force, so the spinning temperature can be controlled by the modification of PEG. The melt-dispersion process provides a new method for modification of thermoplastic epoxy resin by PEG. High spinnability of thermoplastic epoxy resin/PEG system was achieved by adjusting the spinning temperature of thermoplastic epoxy resin. The melt-dispersed PEG can significantly improve the spinnability of the thermoplastic epoxy resin, and the developed thermoplastic epoxy resin/PEG filament has higher mechanical properties.

Key words: epoxy resin, polyethylene glycol, thermoplastic, spinnability, melt-dispersion, melt-drawing technology, epoxy resin filament

CLC Number: 

  • TQ342

Fig.1

Preparation process of epoxy resin film"

Fig.2

Preparation process of epoxy resin/PEG filament"

Fig.3

Stress-strain curves of epoxy resin film"

Fig.4

Temperature-storage modulus (a) and temperature-tanδ (b) curves of epoxy resin film"

Fig.5

Molecular chain structure of epoxy resin/PEG"

Fig.6

Extrusion force of epoxy resin/PEG pellets in pulverizer"

Tab.1

Spinning temperature and extrusion force of thermoplastic epoxy resin/PEG pellets"

试样名称 纺丝温度/℃ 挤出力/kN 平均直径/mm
PEG0 300 1.92 0.25
PEG2.5 290 1.90 0.23
PEG5 280 1.88 0.22
PEG7.5 270 1.85 0.20

Fig.7

Stress-strain curves of epoxy resin/PEG filaments"

Tab.2

Statistical results of stress-strain test for thermoplastic epoxy resin/PEG filaments"

试样名称 弹性模
量/MPa		 屈服应
变/%		 屈服应
力/MPa		 断裂应
变/%		 断裂应
力/MPa
PEG0长丝 2 258 4.6 68 200 76
PEG2.5长丝 1 495 5.6 65 260 96
PEG5长丝 1 524 6.0 73 212 89
PEG7.5长丝 2 116 5.7 69 230 78

Tab.3

Statistical results of dynamic mechanical test for epoxy resin/PEG filament"

试样名称 Tg/℃ 不同温度下的储存模量/MPa
25 ℃ Tg
PEG0长丝 102.7 2 690 45
PEG2.5长丝 95.7 2 732 40
PEG5长丝 87.1 2 801 43
PEG7.5长丝 81.8 2 755 43
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