| WANG Mei-gui,WANG Xiang-ling,YE Xiang-yuan.Preparation and Properties of the Amino-modified Fluorinated Graphene Enhanced Thermoplastic Polyurethane[J],51(9):141-150 |
| Preparation and Properties of the Amino-modified Fluorinated Graphene Enhanced Thermoplastic Polyurethane |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.014 |
| KeyWord:thermoplastic polyurethane amino-modified fluorinated graphene mechanical properties friction coefficient wear volume |
| Author | Institution |
| WANG Mei-gui |
Baoji University of Arts and Sciences, Shaanxi Baoji , China |
| WANG Xiang-ling |
Baoji University of Arts and Sciences, Shaanxi Baoji , China |
| YE Xiang-yuan |
Baoji University of Arts and Sciences, Shaanxi Baoji , China |
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| Abstract: |
| The paper aims to prepare the amino-modified fluorinated graphene/thermoplastic polyurethane composites to further improve the comprehensive properties of thermoplastic polyurethane (TPU). In this paper, amino-modified fluorinated graphene (AFG) is obtained by modifying urea molecules on the surface of fluorinated graphene (FG) by nucleophilic substitution reaction. Using AFG as filler, a series of amino-modified fluorinated graphene/thermoplastic polyurethane (AFG/TPU) composite films with different mass concentration are acquired. The surface morphology and lamellar thickness of FG and AFG nanosheets are analyzed by Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM). X-ray Photoelectron Spectroscopy (XPS), X-ray Diffractometer (XRD) and Raman Spectrometer (Raman) are used to identify the distribution of elemental changes, crystal type structure and substance composition of FG and AFG nanosheets. The mechanical and tribological properties of AFG/TPU composite films are tested by universal material testing machine and multifunctional friction and wear testing machine. AFG is obtained after the nucleophilic substitution reaction between urea molecules and the C-F bond on FG surface, which makes AFG lamellar surface not only have a large number of fluorine elements, but also have amino functional groups that can form hydrogen bond force with TPU molecular chain, thus, ensuring that AFG can be evenly dispersed in TPU matrix. The tensile strength of 3.25-AFG/TPU composite film is 5.97 MPa, which is 36.6% higher than that of 3.25-FG/TPU composite film (4.37 MPa). Compared with pure TPU, which tensile strength is 2.51 MPa, the tensile strength of 3.25-AFG/TPU composite film is increased by 137.8%. The wear volume of pure TPU is 0.56 mm3, and that of 3.25-FG/TPU composite is 0.42 mm3, the wear volume is decrease by 25% than pure TPU. The wear volume of 3.25-AFG/TPU composite is 0.18 mm3, compared with pure TPU, the wear volume of 3.25-AFG/TPU is reduce by 67.8%. The wear rates of 3.25-AFG/TPU composite films is 1.67×10-2 mm3/(N.m), compared with the wear rate of TPU (5.18×10-2 mm3.N-1.m-1), it decreased by 67.8%. When AFG is used as nano filler, AFG with mass fraction of 3.25% is the best addition, which can effectively enhance the mechanical and tribological properties of TPU. FG and AFG are used as nano fillers respectively, it is found that the mechanical and tribological properties of 3.25-AFG/TPU are better than 3.25-FG/TPU, on account of AFG maintains good dispersion of FG, which makes it uniformly dispersed in the TPU matrix, and the surface amino group gives the AFG and the TPU molecular chain to form hydrogen bonding force, so that the tensile stress and friction shear force can be transmitted to the AFG nanomaterial surface through the TPU molecular chain, and ultimately effectively enhance the TPU of tensile strength and wear resistance. The micro-morphological analysis of the composite tensile section shows that the stress can be transmitted from the TPU molecular chain to the AFG surface, and the AFG plays a role in a dispersion stress. Wear surface analysis indicates that the wear mechanism of TPU and AFG/TPU composite film is mainly fatigue wear. Therefore, the AFG nanosheets enhance the interaction between AFG and TPU matrix, which ultimately not only improves the TPU of mechanical property, but also the TPU of tribological property can be enhanced. |
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