【摘要】 研究塑化温升现象有助于把握聚合物的成型加工过程，同向双螺杆挤出加工中，无法实时测量物料的沿程温升情况，因此，采用同向啮合双转子密炼设备模拟其加工过程，研究了时间、温度、转子转速和啮合间隙等参数对不同分子量聚乙烯(PE)塑化温升情况的影响，记录并分析了物料温度和分子量分布的变化。结果表明，物料加入密炼仓后，其温度先降低后升高，并且，随着时间的延长(约15 min),物料温度达到最大；由于PE的分子量不同，在较高加工温度下，高分子量PE的物料温升更显著，在240℃时的温升约为0.5℃;在较低加工温度下，低分子量PE的物料温升更显著，在120℃下的温升约为1.1℃;高转子转速和低啮合间隙为加工过程提供了更高的剪切作用，使物料，特别是更高分子量的PE产生更高的黏性耗散，因此，物料温升现象更显著。更多还原

【Abstract】 Investigating the plasticizing temperature rise aids in understanding the polymer molding process. In co-rotating twin-screw extrusion, real-time measurement of material temperature along the process was not feasible. Consequently, a co-rotating twin-rotor mixing apparatus was employed to mimic this process. The study examined how parameters like time, temperature, rotor speed, and meshing clearance influence the plasticizing temperature rise of polyethylene(PE) with varying molecular weights. Additionally, changes in material temperature and molecular weight distribution were documented and analyzed. The results showed that the material’s temperature showed a phenomenon of first decreasing and then increasing after adding to the mixing chamber, and with the extension of mixing time, the material’s temperature reached its maximum value after mixing and plasticizing for about 15 min. The difference in molecular weight lead to a more significant temperature rise for high molecular weight PE at high mixing temperatures, about 0.5 ℃ at 240 ℃, while low molecular weight PE had a more significant temperature rise at low mixing temperatures, about 1.1 ℃ at 120 ℃. High rotor speeds and low meshing gaps provided a greater shearing action in the processing, which results in higher viscous dissipation, especially for materials with higher molecular weight polyethylene(PE); consequently, the phenomenon of material temperature rise was more pronounced.更多还原