Study on Dispersibility and Mechanical Properties of MWCNT and CNFCA in Unsaturated Polyester Resin

doi:10.19491/j.issn.1001-9278.2021.03.005

Abstract

Abstract:

A surface modification was performed to improve the dispersibility of multi?walled carbon nanotubes （MWCNT） using an ultrasonic method. Citrated cellulose （CNFCA） as a natural filler was also surface modified by means of a noncovalent functionalization method. MWCNT/CNFCA?reinforced unsaturated polyester resin （UPR） nanocomposites were prepared and their structure and performance were investigated by using polarizing optical microscope， rotation rheometer， SEM， TEM and universal test machine. The results indicated that the tensile properties of the nanocomposites were improved with the addition of MWCNT. The dispersibility of MWCNTs could be improved with the aid of solvent ultrasound， resulting in a further improvement in the mechanical properties of the nanocomposites. The addition of CNFCA greatly improved the mechanical properties of UPR/MWCNT composites. A combination of ultrasonic dispersion and grinding method can make CNFCA and MWCNT bind together， improving their dispersibility in UPR resin.

Key words: unsaturated polyester, carbon nanotubes, cellulose, ultrasound, rheology

CLC Number:

TQ323.4⁺1

TENG Fangrui, WANG Xiaofeng, JIANG Jing, CUI Xinnan, HAN Wenjuan, UYAMA Hiroshi, LI Qian. Study on Dispersibility and Mechanical Properties of MWCNT and CNFCA in Unsaturated Polyester Resin[J]. China Plastics, 2021, 35(3): 30-37.

Figures/Tables 10

样品编号	溶剂	超声处理/min	溶剂挥发温度/℃	MWCNT/ %	CNFCA/ %
0^#	—	—	—	—	—
1^#	—	30	—	0.3	—
2^#	苯乙烯	30	80	0.3	—
3^#	苯乙烯	30	80	0.3	0.1

Tab.1. Sample parameters

Fig.1. Flow chart for preparation of the composite materials

Fig.2. SEM image of different fillers(×10 000)

Fig.3. TEM image of different fillers

Fig.4. Dispersibility of MWCNT in liquid resin with different components

Fig.5. Steady state shear rheological viscosity of MWCNT with different components

Fig.6. Oscillating shear rheological changes of MWCNTs with different component

Fig.7. SEM images of the fractured section of the composite materials

Fig.8. Tensile properties of the composites with different components

Fig.9. Nanoindentation data of the composites with different components

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