【摘要】 研究线型低密度聚乙烯（ＬＬＤＰＥ）和低密度聚乙烯（ＬＤＰＥ）分别与高密度聚乙烯（ＨＤＰＥ）进行共混改性后，对聚乙烯／炭黑复合正温度系数（ＰＴＣ）材料特性的影响．试验表明：ＬＬＤＰＥ与ＨＤＰＥ共混可形成共晶结构，而ＬＤＰＥ与ＨＤＰＥ共混后存在两种结晶结构，用ＬＬＤＰＥ改性ＨＤＰＥ，可使复合材料的机械物理性能大大改善，又不太影响其ＰＴＣ特性，是实现复合ＰＴＣ材料实用化的一条有效途径．更多还原

【Abstract】 The PTC (positive temperature coefficient) properties of different polyethylene mixtures/carbon black composite are investigated in this paper. Experiments show that the LLDPE (line low density polyethylene) and HDPE (high density polyethylene) composite can form a cocrystalline structure, and two types of crystalline structure exist in the composite of LDPE (low density polyethylene) and HDPE. The mechanical and physical properities of polyethylene/carbon black composite are improved by adding LLDPE in HDPE, and the composite remains well behaved in PTC properties.更多还原