本文制备了石墨纤维填充聚偏氟乙烯和超高分子量聚乙烯(GF/PVDF/UPE)复合体系.实验结果表明,少量UPE的加入能够很好的消除NTC效应;PVDF/UPE的质量比对体系的室温电阻率和PTC效应均产生了显著的影响:随着UPE比例的增加,体积电阻呈现先减小后增大的变化趋势;少量UPE时,在160℃处出现单PTC效应,而后随着含量增加的复合物分别在140℃附近和160℃附近出现两次PTC效应.

The artificial aging behavior of pure HIPS and stabilized HIPS was studied under the accelerated conditions of UVA, UVB and xenon lamps. The results showed that the carbonyl and hydroxyl absorption peaks of HIPS increased with the aging time. After UVB aging, the elongation at break and impact strength of pure HIPS decreased significantly, the tensile strength and bending strength decreased gradually,and the bending modulus increased, while the corresponding mechanical properties of stabilized HIPS decreased slowly. SEM showed that a lot of cracks were found on the surface of pure HIPS after UVB aging,and the stabilized HIPS showed good aging resistance.