【摘要】 研究了基体、工艺等影响高分子复合型 PTC材料稳定性的因素。通过共混等手段 ,对比了 PE、L L DPE、L L DPE/PP及 L L DPE/硅烷等体系 ,得到了稳定性较好的基体材料。并通过扫描电镜 (SEM)观察了不同体系的试样断面的微观形貌。经过研究 ,认为将 L L DPE接枝硅烷或在 L L DPE中添加 PP作为成核剂 ,可以改善基体树脂的结晶形态 ,加强晶区与非晶区之间的联系 ,在一定程度上提高材料的稳定性。更多还原

【Abstract】 The factors such as matrix and technology that influence the thermal stability of polymeric composite PTC(Positive Temperature Coefficient) material were studied. Scanning electronic microscope(SEM) was used to observe the microscopic pattern of the fracture surface of test samples. The matrix systems of PE, LLDPE/PP and LLDPE g silane were investigated by using the technology of blending, and a matrix system(LLDPE g silane) with good stability was found. Based on the results of experiments, the following conclusions were obtained: When LLDPE is graphed by silane or blended with little PP as nucleator, the crystal shape of matrix can be changed and the relation between crystalline regions and amorphous regions can be strengthened. The thermal stability of this kind of material is improved after matrix is modified.更多还原