采用两种不同烷基链长的硅烷偶联剂(十六烷基三甲氧基硅烷和丙基三甲氧基硅烷)改性氧化镁(MgO)纳米粒子.红外光谱(FTIR)和固体核磁(13C NMR)证明硅烷偶联剂成功接枝到MgO粒子表面,TEM图显示烷基硅烷表面改性的MgO在有机溶剂中分散更好.采用熔融共混法制备了MgO含量为1%的MgO/LDPE和MgO/XLPE纳米复合材料,研究MgO纳米粒子对纳米复合材料力学性能、热性能以及空间电荷分布的影响.结果表明:MgO可在一定程度上提高LDPE和XLPE的初始热分解温度,并可明显抑制材料中的空间电荷.XLPE、MgO/XLPE、MgO-C3/XLPE和MgO-C16/XLPE的平均体电荷密度分别为7.1 C/m3、2.4 C/m3、1.3 C/m3和2.0 C/m3.
MgO nanoparticles were modified by two silane coupling agents with different alkyl chain lengths (hexadecyltrimethoxysilane and propyltrimethoxysilane). Fourier transform infrared (FT-IR) spectra and solid-state 13C nuclear magnetic resonance (NMR) spectra were employed to confirm that the silane coupling agents had been grafted on the MgO nanoparticles surface successfully. TEM images showed that the modified MgO had better distribution in the organic solvent. The low density polyethylene (LDPE) and cross-linked polyethylene (XLPE) based nanocomposites with 1% MgO nanoparticles were prepared by melt blending, and the effect of MgO nanoparticles on the mechanical, thermal properties, and space charge distribution of the nanocomposites were studied. The results reveal that the addtion of MgO can increase the initial thermal decomposition temperature of LDPE and XLPE, and suppress the space charge in materials obviously. The average space charge density of XLPE, MgO/XLPE, MgO-C3/XLPE, and MgO-C16/XLPE is 7.1 C/m3, 2.4 C/m3, 1.3 C/m3, and 2.0 C/m3 respectively.
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