基于SPE的PA6基永久抗静电复合材料研究

Synthesis and Characterization of PA6 Matrix Permanent Antistatic Composites Based on SPE

以己内酰胺和聚乙二醇(PEG)为原料,熔融缩聚制备得到聚醚酰胺(PA6–PEG)共聚物,使用双螺杆挤出机,将其与硬脂酸锂(C18H35Li O2)进行复合加工得到基于高分子固体电解质的PA6基永久抗静电复合材料。使用傅里叶变换红外光谱、热重分析对复合材料的结构和热性能进行表征,并测试了复合材料的抗静电性能和力学性能。结果表明,C18H35Li O2中Li+主要和共聚物PEG软段醚键上的氧原子发生络合反应,C18H35Li O2的加入有效降低了PA6–PEG共聚物的表面电阻率,当其质量分数为7%时,复合材料表面电阻率下降到约1×109Ω;复合材料具有良好的热稳定性,起始分解温度在380℃以上,其随C18H35Li O2质量分数的增加而降低;与PA6–PEG共聚物相比,复合材料的力学性能降低,但C18H35Li O2质量分数在5%以内时,复合材料力学性能比较稳定。

Taking carprolactam and polyethylene glycol （PEG） as raw materials, poly（ether amide） （PA6-PEG） copolymer was synthesized by melt-polycondensation, then PA6 matrix permanent antistatic composites based on solid polymer electrolyte （SPE） were successfully prepared via melt blending with PA6-PEG copolymer andC18H35LiO2 in twin-screw extruder. The structure, thermal properties of the composites were characterized by FTIR, TG and the antistatic properties, mechanical properties were tested. The results show that lithium ions in C18H35LiO2 are mainly coordinated with the oxygen atom of ether bond of PEG chains in the copolymer. C18H35LiO2 added to the copolymer effectively reduces the surface resistance of PA6-PEG copolymer, when the mass fraction of C18H35LiO2 is 7%, the surface resistance of the composite is reduced to about 1 × 10^9 Ω. The composites have good thermal stability and high initial decomposition temperature （above 380 ℃ ） which decreases with the increase of mass fraction of C18H35LiO2. Compared with PA6-PEG copolymer, the mechanical properties of the composites decrease, however, the mechanical properties of the composites are stable when the mass fraction of C18H35LiO2 is less than 5%.