目前国产毛细管流变仪大致有两类,一类是恒速率型,即速率可调;另一类是恒负荷型,即负荷可调,后者如吉林大学科教仪器厂生产毛细管流变仪(以下简称流变仪),该仪器的测试原理是将聚合物材料加热熔融后,在恒定的负荷下被压出,同时用一位移传感器测量压头在某一恒定负荷下与时间的关系,从计录仪上的曲线便可求出切变速率。图1为流变仪工作示意图,可以看出该仪器的测试方法与通常采用的霍普勒塑性计测试聚合物蠕变实验方法基本相同,只是在放置试样的部位有所差异。因此,若能将流 At present, there are roughly two types of domestic capillary rheometer, one is the constant rate type, which rate is adjustable; the other is constant load type, which load is adjustable, the latter such as Jilin University Science Instrument Factory production of capillary rheometer Hereinafter referred to as the rheometer), the test principle of the instrument is heated and melted polymer material, the pressure is extruded at a constant load, while using a displacement sensor to measure the pressure head at a constant load with time, from Recorder curve can be obtained shear rate. Figure 1 is a schematic diagram of rheometer work, we can see that the instrument test method and the commonly used Hopper plasticity test polymer creep test method is basically the same, but the sample placed in the site vary. Therefore, if we can stream