Preparation and characterization of oriented thermoplastic polyolefin/PAN/ MWCNT composites

doi:10.19491/j.issn.1001-9278.2022.08.008

Abstract

Abstract:

A series of polyacrylonitrile （PAN）/carbon nanotube （MWCNT） nanofiber membranes with different orientation degrees were prepared through electrospinning using a high?speed rotating roller and thermal post?treatment. This process resulted in an improvement in the crystallinity of PAN， thus improving the tensile strength and elastic modulus of the nanofiber membranes and decreasing their elongation at break. The PAN/MWCNT nanofiber membranes exhibited optimal mechanical properties at an MWCNT content of 0.5 wt%. A series of thermoplastic polyolefin （POE） composi?tes with the PAN/MWCNT nanofiber membranes at different orientation degrees were prepared using an immersion method. The POE/h?P2M composite with a high orientation degree showed an increase in tensile strength by 71% compared to the POE/u?PM composite without orientation， but its elongation at break decreased. The composites exhibited optimal mechanical performance at a nanofiber?membrane content of 6.7 wt%.

Key words: electrostatic spinning, carbon nanotube, nanofiber, orientation, mechanical performance

CLC Number:

TQ325.1

DU Qing, HE Yi, YU Tanjing, LAN Yanjiao, ZHAO Yanzhi, ZHOU Juying. Preparation and characterization of oriented thermoplastic polyolefin/PAN/ MWCNT composites[J]. China Plastics, 2022, 36(8): 49-55.

Figures/Tables 13

Fig.1. TEM images of MWCNTs before and after processing

Fig.2. TEM images of of PAN/MWCNTs fiber membranes with different MWCNTs contents

Fig.3. Stress?strain curves of PAN/MWCNTs fiber membranes

Fig.4. Stress?strain curves of PAN/MWCNTs fiber membranes with different orientation

样品	弹性模量/MPa	拉伸强度/MPa	断裂伸长率/%
u⁃PAN/MWCNTs	40±0.1	2.2±0.2	9.4±2
o⁃PAN1/MWCNTs	130±0.3	3.6±0.2	11.5±2
h⁃PAN1/MWCNTs	880±0.2	5.9±0.2	4.2±1
o⁃PAN2/MWCNTs	680±0.2	5.8±0.3	9.1±2
h⁃PAN2/MWCNTs	880±0.2	7.6±0.4	3.0±1

Tab.1. Mechanical properties of PAN/MWCNTs fiber membranes with different orientation

Fig.5. XRD spectra of PAN/MWCNTs fiber membrane with different MWCNTs mass contents

Fig.6. XRD spectra of different fiber membranes

Fig.7. FTIR spectra of the samples

Fig.8. TG curves of the samples

Fig.9. Stress?strain curves of POE/PM composite materials with different orientation

样品	弹性模量/MPa	屈服强度/MPa	断裂伸长率/%
POE/u⁃PM	52±2	3.1±2	103±5
POE/o⁃P1M	66±3	3.9±2	48±5
POE/h⁃P1M	77±3	4.8±3	30±3
POE/o⁃P2M	67±2	4.5±3	38±5
POE/h⁃P2M	125±4	5.3±4	24±2

Tab.2. Mechanical properties of POE/PM composite materials with different orientation

Fig.10. Stress?strain curves of POE/PM composite materials with different orientation

Fig.11. SEM images of tensile fracture sections of POE/PM composite materials with different orientation

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