Experimental study on microwave enhanced removal of residual dimethyl sulfoxide from polyacrylonitrile film

doi:10.19491/j.issn.1001-9278.2023.10.001

Abstract

Abstract:

The microwave removing process of residual dimethyl sulfoxide （DMSO） from polyacrylonitrile （PAN） films was studied using X⁃ray diffraction， elemental analysis， and scanning electron microscopy. The effects of microwave power and processing time on the DMSO removal efficiency， microstructure， and mechanical properties of PAN films were analyzed. The experimental results indicated that the residual amount of DMSO in PAN continued to decrease with an increase in the microwave processing power and microwave processing time. The crystallinity of PAN film tended to decrease at first and then increased. Meanwhile， the grain size continued to increase， the micropore size of PAN film decreased significantly， the overall tensile strength increased， and the elongation at break decreased. After treated with 540 W microwave for 4 minutes， the tensile strength of the PAN film reached 21.36 MPa， which was 46.5 % higher than that of the initial film. The average pore size inside the PAN film decreased and the overall structure became denser.

Key words: polyacrylonitrile film, residual dimethyl sulfoxide, microwave, removal, microstructure

CLC Number:

TQ325.8

ZHANG Ce, YANG Weimin, TAN Jing, DING Yumei, CHENG Lisheng. Experimental study on microwave enhanced removal of residual dimethyl sulfoxide from polyacrylonitrile film[J]. China Plastics, 2023, 37(10): 1-7.

Figures/Tables 13

Fig.1. Experimental design of microwave drying densification of PAN thin films

微波功率/W	C元素含量/%	H元素含量/%	N元素含量/%	S元素含量/%	DMSO 含量/%
0	59.87	5.36	21.41	2.85	6.95
120	64.04	4.97	23.72	0.74	1.80
385	65.25	5.19	24.11	0.43	1.05
700	65.57	5.06	24.45	0.21	0.51

Tab.1. Changes in main element content of PAN thin films with microwave power

微波时间/min	C元素含量/%	H元素含量/%	N元素含量/%	S元素含量/%	DMSO 含量/%
0	59.87	5.36	21.41	2.85	6.95
2	64.76	5.07	23.93	0.53	1.29
4	65.25	5.19	24.11	0.43	1.05
6	65.38	5.1	24.26	0.29	0.71

Tab.2. Changes in main element content of PAN thin films with microwave time

Fig.2. XRD spectra of PAN thin films treated with various microwave power

Fig.3. Effect of microwave power on the crystallinity and grain size of PAN thin films

Fig.4. XRD spectra of PAN thin films treated with different microwave time

Fig.5. Effect of microwave drying time on the crystallinity and grain size of PAN thin films

Fig.6. SEM of PAN thin films treated with different microwave power

Fig.7. Changes in average pore size of PAN thin films under varied microwave power

Fig.8. SEM of PAN thin films treated with different microwave time

Fig.9. Changes in average pore size of PAN films under different microwave time

Fig.10. Change in mechanical properties of PAN thin films with microwave power

Fig.11. Changes in mechanical properties of PAN thin films with microwave time

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