Effect of impregnation method on vacuum bag press molding process and properties of polyamide 6 composites

doi:10.19491/j.issn.1001-9278.2022.09.001

Abstract

Abstract:

In this paper， glass fiber reinforced polyamide 6 （PA6/GF） composites were prepared through anionic polymeri⁃zation of caprolactam and vacuum⁃bag press molding （VBPM）. The effects of parameters such as curing temperature and impregnation method on the monomer conversion， crystallinity， and mechanical properties of the composites were investigated using continuous fiber⁃reinforced polyamide 6 reactive injection as a self⁃built VBPM experimental platform. The results indicated that the composites fabricated by isothermal impregnation had a high degree crystallinity and good internal homogeneity. Compared to the isothermal impregnation， the non⁃isothermal impregnation promoted higher overall reaction conversion and better mechanical performance for the fabricated composites. Through the non⁃isothermal impregnation， the composites obtained at the outlet achieved an increase in bending and shear strength by 10 %~13 % and 11 %~16 % than that at the inlet， respectively. The bending strength of the composites obtained at the outlet reached a maximum value of 273.65 MPa at 150 ºC， and their maximum shear strength reached 47.32 MPa at 170 ºC.

Key words: vacuum?bag press molding, polyamide 6, fiber, reinforcement, composite, impregnation method

CLC Number:

TQ320.66

JIA Mingyin, DONG Xianwen, WANG Jiaming, CHEN Ke. Effect of impregnation method on vacuum bag press molding process and properties of polyamide 6 composites[J]. China Plastics, 2022, 36(9): 1-6.

Figures/Tables 8

Fig.1. Schematic diagram of VBPM experimental setup

Fig.2. Schematic diagram of the isothermal and non⁃isothermal impregnation methods

Fig.3. Surface quality of PA6/GF composite at exit and entrance with the isothermal and non⁃isothermal impregnation methods

浸渍方式	GF含量/%		密度/ $k g ∙ m - 3$		孔隙率/%
浸渍方式	入口	出口	入口	出口	入口	出口
非等温浸渍	70.37	73.08	1 787.69	1 849.32	1.427	0.796
等温浸渍	69.86	72.54	1 776.83	1 841.03	0.709	0.672

浸渍方式	GF含量/%		密度/ $k g ∙ m - 3$		孔隙率/%
浸渍方式	入口	出口	入口	出口	入口	出口
非等温浸渍	70.37	73.08	1 787.69	1 849.32	1.427	0.796
等温浸渍	69.86	72.54	1 776.83	1 841.03	0.709	0.672

Tab. 1. Effect of impregnation method on properties at the exit and entrance of PA6/GF composites

Fig.4. DSC and XRD curves for the exit and entrance of PA6/GF composites by the isothermal and non⁃isothermal impregnation methods at 150 ℃ curing temperature

Fig.5. Effect of impregnation method on the reaction conversion at the exit and entrance of PA6/GF composites

Fig.6. Effect of impregnation method on the mechanical properties of PA6/GF composites at the exit and entrance

Fig.7. SEM images of the microscopic morphology at the exit and entrance of PA6/GF composites with both impregnation methods at 170 ℃ curing temperature

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