Study on toughening modification and foaming behavior of biobased polyamide 56/polyamide 66 blends by polyamide elastomer

doi:10.19491/j.issn.1001-9278.2024.05.010

Abstract

Abstract:

Biobased polyamide 56 （PA56）/polyamide 66 （PA66） blends were toughened by using polyamide elastomer （MH2030）， and then a series of bio⁃based polyamide blend foams were prepared through a supercritical CO₂ intermittent foaming technology. The effect of MH2030 content on the crystallization， rheological， mechanical properties， and foaming behaviors of the PA56/PA66/MH2030 blends was investigated. The results indicated that the introduction of MH2030 improved the viscoelasticity and foaming performance of the blends， leading to a shift of the crystallization peak toward a high temperature. This may be due to the nucleating effect of MH2030 on the crystallization of the blending system. The addition of MH2030 also increased the toughness of the blends but reduced their rigidity. The blend containing 20 wt% MH2030 exhibits the highest impact strength， which is 30.4 % higher than that without MH2030. The foaming behavior and compression performance of the blend foams were investigated. The blend form containing 10 wt% MH2030 exhibits a higher cell density and better matrix mechanical properties. In this case， the blend foam obtained micro⁃size pores with a smaller cell size of 19.24 μm and higher compressive strength of 0.71 MPa， which was 29.1 % higher than that of the non⁃toughened PA56/PA66 blend foam.

Key words: biobased polyamide 56 foam, polyamide elastomer, foaming behavior, mechanical property

CLC Number:

TQ323.6

ZHANG Zhiqi, WANG Xiangdong, LIU Haiming, CHEN Shihong. Study on toughening modification and foaming behavior of biobased polyamide 56/polyamide 66 blends by polyamide elastomer[J]. China Plastics, 2024, 38(5): 55-60.

Figures/Tables 11

样品编号	PA56/份	PA66/份	MH2030/份	ADR/份	B215/份
1^#	80	20	0	4	0.5
2^#	80	20	5	4	0.5
3^#	80	20	10	4	0.5
4^#	80	20	15	4	0.5
5^#	80	20	20	4	0.5

Tab.1. Formula of the samples

Fig.1. Flowchart of preparation of the modified PA56 foam

Fig.2. Molecular structure of the main raw materials and reaction mechanism of the melt blending

Fig.3. Torque curves of the PA56/PA66 blends with different MH2030 contents

Fig.4. Changes of （a） G′ and （b） η* of the PA56 /PA66 blends with different MH2030 contents with shear frequency

Fig.5. （a） Melting and （b） crystallization curves of the PA56/PA66 blends with different MH2030 contents

样品	结晶温度/℃	熔融温度/℃	熔融焓/（J·g^-1）
1^#	218.14	252.34	29.48
2^#	218.78	252.22	30.57
3^#	219.89	251.30	31.79
4^#	220.83	250.83	34.07
5^#	221.80	250.51	35.13

Tab.2. Thermal properties of the modified PA56 materials

Fig.6. Mechanical properties of the PA56/PA66 blends with different MH2030 contents

Fig.7. Cell morphology of the modified PA56 foams with different MH2030 contents at saturation temperature of （a）251 ℃，（b）255 ℃ and （c）259 ℃

Fig.8. Cell parameters of the modified PA56 foams obtained at 255 ℃

Fig.9. （a） Compressive stress⁃strain curves and （b） compressive strength of the modified PA56 foams

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