反应挤出纳米类水滑石/尼龙6复合材料的结构与性能

采用自制的双甲氧基苯甲酸根离子柱撑镁铝类水滑石(MgAl-HTlcs)和己内酰胺(CL)为主要原料,利用反应挤出工艺制备了纳米MgAl-HTlcs/尼龙6复合材料,研究了MgAl-HTlcs含量对复合材料结构与性能的影响。TEM照片显示:MgAl-HTlcs在复合材料中呈纳米级均匀分散,当MgAl-HTlcs含量为1.0wt%(占MgAl-HTlcs与CL总质量的质量分数)时出现了部分片层剥离的类水滑石。紫外光谱结果表明:与纯尼龙6相比,少量均匀分散的MgAl-HTlcs使复合材料对近紫外波长为320~380nm的紫外线吸收效果明显。XRD和DSC结果表明:少量均匀分散的MgAl-HTlcs对尼龙6起到了很好的异相成核剂的作用,不仅提高了其结晶温度,也增加了其结晶度。热重分析显示:部分片层剥离MgAl-HTlcs的存在明显提高了复合材料的热稳定性。

Structure and properties of nano hydrotalcite/nylon 6 composites prepared by reactive extrusion

With the main raw meterials of self-made double methoxybenzoic acid anion pillared hydrotalcite (MgAl-HTlcs) and caprolactam(CL), nano MgAl-HTlcs/nylon 6 composites were prepared by reactive extrusion, and the effect of MgAl-HTlcs content on microstructure and properties of the composites were investigated. TEM photographs show that MgAl-HTlcs disperse uniformly in composites as nanoscale and there are part exfoliated hydrotalcite in composite with MgAl-HTlcs of 1.0wt%(mass fraction of MgAl-HTlcs, CL total quality). UV-Vis spectra show that, compared with pure nylon 6, the MgAl-HTlcs/nylon 6 composites can strongly absorb the ultraviolet rays whose wavelength is between 320-380 nm. XRD and DSC results show that a small amount of MgAl-HTlcs plays a good role in heterogeneous nucleation of nylon 6, and improves its crystallization temperature and crystallinity. Thermogravimetric analysis shows the exists of part exfoliated MgAl-HTlcs, which improves the thermal stability of composites obviously.