【摘要】 测量纳米SiOx/低密度聚乙烯(LDPE)复合介质在强场下的电导特性时,发现这种介质具有预电应力效应,即复合e)dtysgye介质经相同极性的较高直流电场(8×107V/m)预压作用2h后,直流电导比预压前的小,并随着纳米SiOx浓度的增加,这种预电应力效应越明显。通过透射电子显微镜(TEM)研究了纳米SiOx与LDPE之间的界面状态及纳米SiOx在LDPE中的分散形态;X射线衍射(XRD)结果表明纳米SiOx影响LDPE的结晶形态;另外运用傅立叶红外光谱(FTIR)研究了纳米SiOx与LDPE分子链间的相互作用。文章最后结合上述微观测试结果解释了纳米SiOx的添加所引起的LDPE强场下的预电应力效应。更多还原

【Abstract】 The effect of electrically pre-stressing in the composite of nano-SiOx / low-density polyethylene (LDPE) was found during measuring the high-electrical-field conduction of the composite. It means that the direct current (DC) conduction of the composite after being electrically pre-stressed with the same polarity high DC electrical stress (about 8×107 V/m) for 2h was lower than that without being pre-stressed. More interesting is that the effect of electrically pre-stressing becomes more obvious with increasing of the content of nano-SiOx. Interfaces between nano-SiOx and LDPE were investigated with transmission electron microscope (TEM), so did the dispersing status of nano-SiOx in LDPE. The effect of nano-SiOx on crystallinity and crystal morphology of the composite was verified via X-ray diffraction (XRD). At the same time, the interaction between nano-SiOx and molecular chain of LDPE was studied with Fourier Transform Infrared Spectrum (FTIR). Finally, the mechanism of the effect of electrically pre-stressing in the composite was explained with microscopic measuring results mentioned above.更多还原