Study on Chemical Foaming Properties of Recycled⁃Carbon⁃Fiber⁃Reinforced Polystyrene Through Torsion Extrusion

doi:10.19491/j.issn.1001-9278.2021.08.012

Abstract

Abstract:

Polystyrene composite foams were prepared with a torsion extrusion technology using reclaimed carbon fiber as reinforcement and nucleating agent. The microstructure and morphology of the foams were reconstructed using X?ray Micro?Computed 3D yomograph and scanning electron microscope. The results indicated that a twist spiral flow occurred in the polymer melt during the process of torsion extrusion， which made the fiber disperse uniformly and orient along the flow direction. The mixing and temperature properties of the whole system were improved with the torsion extrusion， and the cell morphology became more uniform. In addition， the quality of the foam was affected by the die temperature. When the die temperature was higher than 180 °C， the surface of the products became uneven and the phenomenon of gas escaping was observed. With the addition of reclaimed carbon fibers， the bubble tended to grow along the fiber direction. However， the bubble nucleation will be inhibited when the fiber content is too high.

Key words: reclaimed carbon fiber, polystyrene, chemical foaming, foam, cell morphology

CLC Number:

TQ327.3

JIAN Ranran, YANG Weimin, MOHINI Sain. Study on Chemical Foaming Properties of Recycled⁃Carbon⁃Fiber⁃Reinforced Polystyrene Through Torsion Extrusion[J]. China Plastics, 2021, 35(8): 88-93.

Figures/Tables 13

Fig.1. Torsion extrusion screw

样品编号	PS/%	CBA/%	CaCO₃/%
1^#	90	10	?
2^#	89.5	10	0.5

Tab. 1. Ratio and dosage of masterbatch

Fig.2. Torsion screw configuration and torsional flow

Fig.3. Length distribution of RCF

Fig.4. Orientation distribution of RCF in non?expanded polymers

Fig.5. Microscopic 3D view of foams at different die temperature

Fig.6. SEM images of foams at different die temperature

Fig.7. Cell size and cell density of foams at different die temperature

性能	纯PS	机头温度/℃
性能	纯PS	160	170	175	180	190
密度/g·cm^-3	1.034	0.480	0.478	0.483	0.467	0.463
发泡倍率	-	2.153	2.161	2.139	2.214	2.232
孔隙率	-	0.535	0.537	0.532	0.548	0.552

Tab. 2. Density， volume expansion rate and void fraction of foams at different die temperature

Fig.8. Microscopic three?plane view of foams with different nucleating agents

Fig. 9. SEM images of foams with different nucleating agents

Fig.10. Cell size and cell density of foams with different nucleating agents

性能	成核剂
性能	无	0.05% CaCO₃	1 %RCF	5 %RCF
密度/g·cm^-3	0.478	0.477	0.538	0.743
发泡倍率	2.161	2.167	1.923	1.392
孔隙率	0.537	0.539	0.480	0.281

Tab. 3. Density， volume expansion rate and void fraction of foams with different nucleating agents

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