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用热重分析(TG)和差热分析(DTA)研究M600,M90—4和H2448三种聚甲醛的热降解和热稳定性。从热重分析曲线计算了活化能,反应速率常数和反应级数。结果表明:三科聚甲醛活化能的次序为:H2448>M-904>M600。 本文用密度梯度、粘度、DSC等方法测定了M600、M90-4、H2448三种聚甲醛的主要物理、化学性能。从性能研究看出,M600具有较低的分子量,较高的结晶度和较差的热稳定性。
Thermogravimetric analysis (TG) and differential thermal analysis (DTA) were used to study the thermal degradation and thermal stability of three kinds of polyoxymethylene (M600, M90-4 and H2448). The activation energy, reaction rate constant and reaction order were calculated from the thermogravimetric analysis curves. The results showed that the order of activation energy of POM was H2448> M-904> M600. In this paper, the main physical and chemical properties of three kinds of polyoxymethylene (M600, M90-4 and H2448) were determined by density gradient, viscosity and DSC. From the performance study shows that, M600 has a lower molecular weight, higher crystallinity and poor thermal stability.