Method for detecting entanglement density of molecular chain of synthetic rubber

The invention belongs to the application field of industries such as tires and products, and relates to a detection method for predicting entanglement density of a synthetic rubber chain by using a rubber processing analyzer (RPA2000). According to the invention, the method comprises the following steps: 1) determining the values of tan delta and dynamic shear modulus G' of a synthetic rubber sample by using an RPA rubber processing analyzer; and (2) calculating the dynamic shear modulus G' obtained by testing by using the following formula to obtain the chain entanglement density Ve: Ve = G'/3RT, R is a molar gas constant and is 8.314 J/(K * mol), and T is the temperature when the tan delta of the rubber material is the minimum value within a certain range. The detection method disclosed by the invention is high in reproducibility and accurate in judgment. 本申请属于轮胎、制品等行业的应用领域，涉及到一种使用橡胶加工分析仪（RPA2000）预测合成橡胶链缠结密度的检测方法。一种合成橡胶分子链缠结密度的检测方法，该方法包括以下的步骤：1）使用RPA橡胶加工分析仪测定合成橡胶样品的tanδ以及动态剪切模量G'数值；2）将测试取得的动态剪切模量G'使用以下公式进行计