使用拉力试验机的614聚氨酯进行应力应变性能测试。将614羟基化的产物和614与HDI按照一定比例复配，搅拌30min后，用四面制备器刮涂在PE膜上，常温固化6h，100℃烘箱1h。用模具裁剪成50✖2（mm）的样条进行拉伸测试。测量羟基化前后该聚氨酯的机械性能是否变化。

The stress-strain properties of 614 polyurethane were tested using a tensile testing machine. The product of 614 hydroxylation was mixed with 614 and HDI in a certain proportion. After stirring for 30min, the product was scraped and coated on PE film with a four-sided preparation device, cured at room temperature for 6h, and oven at 100℃ for 1h. Stretch test with 50✖2 (mm) spline cut by mold. The mechanical properties of the polyurethane were measured before and after hydroxylation.