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.

中文翻译：

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钛酸酯偶联剂对煤density石填充高密度聚乙烯复合材料性能的影响

在这项研究中，煤tit石（CG）的表面改性是用钛酸酯偶联剂201（异丙基三（二辛基焦磷酸）钛酸酯）进行的，并且表面改性剂对填充CG（HDPE）的高密度聚乙烯的机械性能和热稳定性的影响/ CG）和填充有改性CG（HDPE / mCG）复合材料的高密度聚乙烯。根据傅立叶变换红外光谱（FT‐IR）和X射线光电子能谱（XPS）的分析，通过化学反应将偶联剂成功嫁接到CG表面，偶联剂可有效增强已验证的表面疏水性水接触角超过改性CG样品的90°。随着偶联剂的引入，拉伸强度，挠曲强度，与HDPE / CG相比，HDPE / mCG具有更高的抗冲击强度和冲击强度，这是由于mCG填料与基质之间的相容性得到了改善。HDPE / mCG复合材料的增加的储能模量和降低的损耗因子进一步证实了改性后的界面粘合性更强。此外，发现钛酸酯偶联剂201可以在一定程度上改善HDPE / mCG复合材料的热稳定性。