铸型PA 6/TiO2纳米复合材料的非等温结晶行为

采用差示扫描量热法(DSC)研究了铸型聚酰胺(PA)6/TiO2纳米复合材料在不同冷却速率下的非等温结晶行为，并用Jeziomy法、Ozawa法和Mo法对DSC测定结果进行了处理。结果表明：纳米TiO2对铸型PA6起到异相成核的作用，提高了铸型PA6的结晶速率和结晶峰温，缩短了半结晶时间。3种方法对比后发现：Ozawa法不适用于铸型PA6及其纳米复合材料非等温结晶动力学的处理，Jeziomy法基本适合，而Mo法最适合。采用Kissinger法计算出铸型PA6及其TiO2纳米复合材料的结晶活化能，发现纳米粒子提高了铸型PA6的结晶活化能．说明纳米TiO2阻碍了铸型PA6的分子链在结晶时的运动。

Study on non-isothermal crystallization behavior of casting polyamide 6/TiO2 nano-composites

The non -isothermal crystallization behavior of casting polyamide 6/TiO2 nano-composites at different cooling rates was studied by means of differential scanning calorimetry (DSC). The data of DSC was treated with the theories of Jeziorny, Ozawa and Mo. The results show that nano -TiO2 can play a role of heterogeneous nucleating agent in polyamide 6, improve the crystallization rate and reduce the half time of crystallization. The comparison between the three theories reveals that Ozawa method is not suitable to describe the non-isothermal crystallization kinetics of polyamide 6 and the nano-composite system thereof, Jeziorny method is substantially suitable Mo is the best. The crystallization activation energies of casting polyamide 6 and its nano-composite were calculated with Kissinger method. It is found out that the nano-TiO2 particles raise the crystallization activation energy of casting polyamide 6, indicating that the nano-TiO2 particles hinders the motion of molecular chains of casting polyamide 6 in the crystallization process.