Mechanical Properties and Foaming Behaviors of Graphene⁃reinforced Poly（lactic acid）

doi:10.19491/j.issn.1001-9278.2021.06.005

Abstract

Abstract:

Poly（lactic acid）（PLA）/graphene nano?platelet （GNP） composites were prepared by melt blending with different GNP contents， and their micromorphologies， mechanical properties， rheological behaviors and foaming properties were investigated. The results indicated that GNP presented a good dispersion in the PLA matrix. Compared to pure PLA， the composites exhibited an improvement in tensile strength and stiffness by nearly 20 % at a GNP content of 3 wt%. In addition， the movement of PLA chains was restricted with gradually increasing the GNP content. This enhanced the viscoelasticity of composite melts significantly， which was beneficial to the PLA foaming. Owing to the heterogeneous nucleation of GNP， the composite foams presented a large foaming ratio more than 30 times， and their compressive strength and modulus increased by 2.5 and 7 times， respectively.

Key words: poly（lactic acid）, supercritical carbon dioxide, graphene nano?platelet, tank pressure foaming, microporous foam

CLC Number:

TQ321

YANG Wenjie, HE Jiawen, ZHU Hanbin, WANG Sisi, LI Xiping. Mechanical Properties and Foaming Behaviors of Graphene⁃reinforced Poly（lactic acid）[J]. China Plastics, 2021, 35(6): 26-32.

Figures/Tables 6

Fig.1. SEM micrographs for the cross?sections of PLA/GNP composites with different GNP content

Fig.2. Tensile properties of PLA/GNP composites with different GNP content

Fig.3. Rheological behaviors of PLA/GNP composites with different GNP content

Fig. 4. SEM micrographs for the cross?sections of PLA/GNP composite foams with different GNP content

Fig.5. Porous parameters of PLA/GNP composite foams with different GNP content

Fig.6. Mechanical properties of PLA/GNP composite foams with different GNP content

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