尼龙12/OMMT纳米复合粉末的制备及性能

利用十八烷基三甲基溴化铵(OTAB)对蒙脱土(MMT)进行有机改性,并通过溶液插层法制备尼龙12/有机蒙脱土(PA12/OMMT)纳米复合粉末。利用X射线衍射、傅立叶变换红外光谱、扫描电子显微镜等手段对改性后的MMT及PA12/OMMT纳米复合粉末的结构和微观形貌进行表征,并将复合粉末热压成型制成标准件,测试其力学性能和热性能。结果表明,经过有机改性,MMT的层间距由1.24 nm增加到了2.13 nm,且改性后的MMT能均匀地分散在PA12基体中,PA12/OMMT纳米复合粉末的成型件在拉伸强度、弯曲强度、冲击强度和热性能方面都优于纯PA12粉末。PA12/OMMT纳米复合粉末为选择性激光烧结技术(SLS)提供了一种性能良好的粉末材料。

Preparation and Performance of PA12/OMMT Nanocomposites

Octedacy trimethyl ammonium bromide (OTAB) was used as organic intercalating cations to modify montmorillonite (MMT). The polyamides (PA)12/OMMT nanocomposites were prepared by the way of solution intercalation. The morphology of MMT and PA12/OMMT nanocomposites was characterized by XRD,FTIR,SEM,and their mechanical and thermal properties were also studied. The results show that the basal spacing of the MMT increases from 1.24 nm to 2.13 nm,and the OMMT is homogeneously dispersed in the PA12 matrix,and the mechanical properties such as the tensile strength,flexural strength,impact strength and the thermal property of the PA12/OMMT nanocomposites are better than those of pure PA12. PA12/OMMT nanocomposite is a good material for selective laser sintering (SLS).