低聚端羟基聚硅氧烷接枝增韧酚醛树脂的制备及性能

Preparation and Performance of Hydroxyl-Terminated Oligomeric Polysiloxane Grafted Toughened Phenolic Resins

由低聚羟基封端聚硅氧烷(HO-PDM)与甲醛和苯酚的接枝反应制备了增韧改性酚醛树脂,用FT-IR对改性酚醛树脂的结构进行表征,用电子万能试验机测试了改性前后酚醛树脂的力学性能,用热重分析仪测试改性酚醛树脂的热稳定性。测得改性酚醛树脂的断裂伸长率、冲击强度、抗拉强度分别为2.8%、2.875 kJ/m2和23.2 MPa;树脂失重20%的温度为431.28℃,峰值温度为441.8℃,800℃的残重率为51.02%。

The hydroxy-terminated oligomeric polysiloxane （HO-PDM） grafted toughened phenolic resin was prepared by the copolymerization of HO-PDM with formaldehyde and phenol. The structure of modified phenolic resin was characterized by FT-IR. The mechanical properties of phenolic resin before and after modification were tested by the electron universal testing machine. The thermal stability of modified phenolic resin was analyzed with the thermal gravimetry. The elongation at break, impact strength, tensile strength of modified phenolic resin are estimated as 2. 8%, 2. 875 kJ/m2 and 23.2 MPa, respectively. The temperature of modified resin at 20% mass loss is 431.28 ℃, the peak temperature is 441.8 ℃, and the residual mass rate at 800 ℃ is 51.02%.