Impact of titanate coupling agent on properties of high density polyethylene composite filled with coal gangue |
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| Authors: | Chong Ding Yihe Zhang Na Zhang Xinke Wang Qi Wei Youpeng Zhang |
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| Institution: | 1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Circular Economy Engineering Laboratory, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, China;2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing, China |
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| Abstract: | In this study, surface modification of coal gangue (CG) was performed with titanate coupling agent 201 (isopropyl tri(dioctylpyrophosphate) titanate), and the effects of surface modifier on mechanical properties and thermal stability of high-density polyethylene filled with CG (HDPE/CG) and high-density polyethylene filled with modified CG (HDPE/mCG) composites were investigated. The coupling agent was successfully grafted on CG surface through chemical reaction according to the analyses of Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the coupling agent can effectively enhance the hydrophobicity of surface that was verified by water contact angle beyond 90° of modified CG sample. With the introduction of coupling agent, some enhancements of tensile strength, flexural strength, and impact strength were observed in HDPE/mCG compared with HDPE/CG, due to the improved compatibility between mCG fillers and matrix. The increased storage modulus and decreased loss factor of HDPE/mCG composite further confirm the stronger interface adhesion after modification. Moreover, it is found that titanate coupling agent 201 can improve the thermal stability of HDPE/mCG composite to some extent. |
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| Keywords: | coal gangue high density polyethylene surface modification titanate coupling agent |
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