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The preparation of polyamide 6/ZnO nanocomposite via in situ method and the investigation of their properties

徐启杰  Hui Yin  Ning Zhang  Qingcai Pan  Mengxi Zhao  Zhun Liu  Shuang Zhang  
【摘要】:The polyamide 6/ZnO nanocomposite was prepared readily by in situ polymerization, with which Zn_2(OH)_2CO_3 was used as filler. This method was beneficial to reduce the calcining process of Zn_2(OH)_2CO_3 to receive ZnO and the production cost of the preparation of polymer-nanoparticle composites. As-prepared composite was characterized by using X-ray diffractometer(XRD),thermogravimetric analyzer(TGA), differential thermal scanning calorimeter(DSC), and polarizing microscope(POM) to test the crystallization properties and thermal stability. The mechanical properties and friction performance of composite were evaluated via using high-speed ring friction testing machine, universal tensile testing machine, impact testing machine. As-obtained results showed that nano-ZnO was derived from Zn_2(OH)_2CO_3 in the process of in situ polymerization of PA6/ZnO nanocomposite. Moreover, nano-ZnO with heterogeneous nucleation effect in the composite led to the improvement of the crystallinity of polyamide 6. Additionally, due to the hindering effect of nano-ZnO on the movement of PA6 molecular chains, that reduced crystallization rate and crystal size of PA6 matrix. The results indicated that the mechanical properties and tribological properties of PA6/ZnO nanocomposites had the improvement than pure polyamide 6.

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