Preparation and Properties of PP/PA6/CNTs In⁃situ Microfiber Composite Films Based on Microlayer Coextrusion

doi:10.19491/j.issn.1001-9278.2021.10.001

Abstract

Abstract:

Polypropylene （PP）/polyamide 6 （PA6）/carbon nanotubes （CNTs） composites were prepared using a twin?rotor continuous mixing extruder and their in?situ microfiber composite films were further fabricated using a micro?nano laminated co?extrusion molding machine. Their microstructure and rheological， crystalline， mechanical， and electrical properties were investigated using scanning electron microscope， rheometer， differential scanning calorimeter， universal tensile tester， and resistance tester. The results showed that PA6/CNTs as a dispersion phase was subjected to form microfibers through a laminated co?extrusion method. The composites not only achieved an improvement in dynamic rheological properties due to the formation of microfibers， but also obtained an increase in the crystallinity and crystallization temperature of the PP phase. The composite films exhibited maximum tensile strength of 42.17 MPa at a CNT content of 0.5 wt%. Their elongation at break reached a maximum value of 857.82 %， but their volume resistivity decreased to 10⁴ Ω·cm. In this case， the composite films showed optimal comprehensive mechanical properties and electrical conductivity.

Key words: polypropylene, polyamide 6, carbon nanotube, in?situ microfiber composite film, micro?nano laminated coextrusion

CLC Number:

TQ327.8

ZHU Yuting, GU Lin, HE Jialong, JI Huajian, WANG Yu, ZHU Huihao, MA Yulu, XIE Linsheng. Preparation and Properties of PP/PA6/CNTs In⁃situ Microfiber Composite Films Based on Microlayer Coextrusion[J]. China Plastics, 2021, 35(10): 1-7.

Figures/Tables 10

Fig.1. Steady?state rheological properties of PA6/CNTs with different CNTs contents

Fig.2. SEM images of PP/PA6/CNTs composites

Fig.3. SEM images of PP/PA6/CNTs in?situ microfiber composite membrane

CNTs含量/%	复合材料分散相粒径/μm	原位微纤复合膜纤维直径/μm
0.05	9.49	12.08
0.25	6.95	9.82
0.50	5.79	7.09
0.75	5.09	6.41
1.00	4.50	5.94
1.50	3.67	5.02

Tab.1. Dispersed phase particle size of PP/PA6/CNTs composites and fiber diameter statistical analysis of in?situ microfiber composite membrane

Fig.4. Dynamic rheological properties of PP/PA6/CNTs composites and in?situ microfiber composite membrane

Fig.5. DSC curves of PP/PA6/CNTs composites and in?situ microfiber composite membrane

材料		结晶温度/°C	熔融温度/°C	熔融焓/ J·g^-1	结晶度/ %
纯PP		115.89	161.69	80.96	38.74
纯PA6		174.15	219.86	50.993	22.17
复合材料	PP	121.68	163.61	76.26	48.65
复合材料	PA6	194.38	218.80	7.89	13.72
原位微纤复合膜	PP	126.07	164.10	87.44	55.67
原位微纤复合膜	PA6	196.72	219.25	10.70	18.61

Tab.2. Crystallization performance of PP/PA6/CNTs composites and in?situ microfiber composite membrane

Fig.6. Tensile fracture image of PP/PA6/CNTs composites and in?situ microfiber composite membrane

Fig.7. Mechanical properties of PP/PA6/CNTs composites and in?situ microfiber composite membrane

Fig.8. Volume resistivity of PP/PA6/CNTs composites and in?situ microfiber composite membrane

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