Investigation On Impact Performance And Dimensional Stability Of Polypropylene Composites In Cryogenic Environment

In order to expand the application of polypropylene (PP) composites in cryogenic environment, short carbon fiber (SCF) was used as the reinforcing phase and the surface of it was modified by graphene oxide (GO), and the maleic anhydride grafted PP (MAPP) was also used to enhance the interface compatibility between the fiber and the matrix. The effects of the GO-modified SCF and the MAPP on the impact properties and dimensional stability of PP composites at cryogenic temperature (CT) (- 196 degrees C) were investigated by systematic analysis of the interfacial properties and microstructure of the composites. The results show that the impact strength of the PP composites was effectively increased by 106.7% (CT) and 170.7% (room temperature), respectively, compared to pure PP. In addition, the transverse and longitudinal shrinkage of PP composites can be reduced to only 0.15% and 0.1%, respectively. The cryogenic impact strength and dimensional stability of PP composites has been greatly improved, which makes PP composites in the application under cryogenic environment is more promising.