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| Preparation and Properties of Composites PP/Graphite Sheets |
Zhengjun WANG1, Xing ZHOU1, Wenqiang XIAO1, Jun BIAN1( ), Daiqiang CHEN2 |
1 School of Materials Science and Engineering, Xihua University, Chengdu 610039, China
2 College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China |
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Cite this article:
Zhengjun WANG, Xing ZHOU, Wenqiang XIAO, Jun BIAN, Daiqiang CHEN. Preparation and Properties of Composites PP/Graphite Sheets. Chinese Journal of Materials Research, 2017, 31(4): 291-299.
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Abstract As raw materials, expanded graphite (EG) sheets were prepared from natural graphite via intercalation-reduction method , while thermally reduced graphene sheets (T-rGO) and chemical reduced grapheme sheets (C-rGO) were prepared from graphene oxide (GO), which was synthesized by Hummers method. Then composites of polypropylene (PP)/graphite sheets were prepared with graphite sheets as fillers and PP as matrix by melt-blending method to produce composites of PP/EG, PP/T-rGO and PP/C-rGO respectively with different filler contents. The structure and properties of the three prepared composites of PP/graphite sheets are characterized by means of X-ray diffractormeter (XRD) , scanning electron microscope (SEM), thermal analysis (DSC), thermal gravimetric analysis (TGA), as well as tensile and impact tests. The results show that the tensile strength of composites of PP/EG and PP/T-rGO with 0.1% of EG or T-rGO, can reach 32.2 MPa and 33.5 MPa, which increased by 7.2% and 11.2%, respectively in comparison with that of the pure PP, while the impact strength of PP/EG and PP/T-rGO composites was improved by 27.4% and 19.6%. The tensile strength and impact strength of the composite PP/C-rGO with 0.3% C-rGO were 37.26 MPa and 37.26 kJ/m2, respectively, which increased by 23.9% and 27%, in comparison with those of the pure PP. The melting temperatures, crystalline temperatures and crystalline degree of PP/graphite sheet composites were higher than those of the pure PP. In contrast to the pure PP, the melting temperature and crystalline degree of PP/C-rGO composites with 0.1% C-rGO increased 10.2oC and 4.2%, respectively. It can be attributed to the "heterogeneous nucleation effect" of graphite sheets, which can induce the regular arrangement of PP molecular chains. The maximum decomposition temperatures of PP/EG, PP/T-rGO and PP/C-rGO composites with 0.1% of graphite sheet showed 13.5 oC, 9.1 oC and 6.9 oC respectively higher than that of the pure PP, indicating that the thermal stability of the composites can be improved by adding a small amount of graphite sheets. The fillers have been dispersed homogeneous in the matrix, but agglomeration appeared when excessive fillers were added.
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Received: 21 June 2016
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| Fund: Supported by Youth Fund Project of Sichuan Provincial Education Department (No.17ZB0422);National Undergraduate Training Programs for Innovation and Entrepreneurship (No.201510623033);the Open Research Subject of Key Laboratory of Special Materials and Preparation Technology (Nos.szjj2015-084＆ szjj2015-086);Xihua University Young Scholars Training Program (No.01201404) |
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